[flexcoders] Re: Problems With my XML Created Array Collection
I am a little late to this party but I would have to recommend using AMF to pass your data back and forth. this allows you to pass objects and arrays of objects both ways. No need to convert objects to XML and back to objects - they are all just objects. When the data comes in you can use ArrayUtil.toArray on the result and create an ArrayCollection from this array. An empty result will have created a zero length array and you can trap on that. I use WebORB for PHP (Community Edition which is free) as the PHP middleware and have never had a problem. I have posted many examples on this forum of how to pass data back and forth. If you need any further help, I am but a post away ;-} I started out in my Flex learning going the XML route but soon got very confused, especially with trying to send arrays of data TO the server. As soon as I figured out how to do it with AMF I converted everything and now will not go back. Best Regards Steve
[flexcoders] Re: Problems With my XML Created Array Collection
Hi Steve. As I said earlier about using e4x I'm reluctant to use amfphp 1. because I already have eveything set up using regular php code and 2. I. struggle to find examples of how to use such methods compared to the regular methods of using traditional php. Would you happen to know if it is possible to send a copy of the array collection that I'm receiving somehow? I basically want it so that when the user logs in it gets the data that we've been discussing throughout this topic and sets it as an array collection in flex and then sends this whole array to the userlinks table I have in my mysql so each user basically has a whole copy of the links table to themselves and can edit this by setting favourites etc. How would you go about this judging by the code that I've got here (the code that Robert provided). I'd prefer to stick to php to upload the array as this project is for my uni course in which I've used php throughout but I suppose I could use amfphp to upload the arrays? Cheers for the advice so far. --- In flexcoders@yahoogroups.com, valdhor valdhorli...@... wrote: I am a little late to this party but I would have to recommend using AMF to pass your data back and forth. this allows you to pass objects and arrays of objects both ways. No need to convert objects to XML and back to objects - they are all just objects. When the data comes in you can use ArrayUtil.toArray on the result and create an ArrayCollection from this array. An empty result will have created a zero length array and you can trap on that. I use WebORB for PHP (Community Edition which is free) as the PHP middleware and have never had a problem. I have posted many examples on this forum of how to pass data back and forth. If you need any further help, I am but a post away ;-} I started out in my Flex learning going the XML route but soon got very confused, especially with trying to send arrays of data TO the server. As soon as I figured out how to do it with AMF I converted everything and now will not go back. Best Regards Steve
[flexcoders] Re: Problems With my XML Created Array Collection
James First off, I would not use AMFPHP as it is deprecated in favor of ZendAMF (Part of Zend Framework). I found WebORB much easier to integrate than ZendAMF. With WebORB you use Object Oriented PHP. You create data transfer classes in both Flex and PHP and map them to each other. then you use class hinting in PHP to receive data from Flex. You can definitely send the arraycollection to PHP. It will arrive as an array of objects. One thing I think you should look into is SharedObjects in Flex. This allows you to save data to the local machine (Kind of like cookies but you have 100K of space you can use) and is very useful to hold these kinds of preferences. Steve --- In flexcoders@yahoogroups.com, James garymoorcroft_...@... wrote: Hi Steve. As I said earlier about using e4x I'm reluctant to use amfphp 1. because I already have eveything set up using regular php code and 2. I. struggle to find examples of how to use such methods compared to the regular methods of using traditional php. Would you happen to know if it is possible to send a copy of the array collection that I'm receiving somehow? I basically want it so that when the user logs in it gets the data that we've been discussing throughout this topic and sets it as an array collection in flex and then sends this whole array to the userlinks table I have in my mysql so each user basically has a whole copy of the links table to themselves and can edit this by setting favourites etc. How would you go about this judging by the code that I've got here (the code that Robert provided). I'd prefer to stick to php to upload the array as this project is for my uni course in which I've used php throughout but I suppose I could use amfphp to upload the arrays? Cheers for the advice so far. --- In flexcoders@yahoogroups.com, valdhor valdhorlists@ wrote: I am a little late to this party but I would have to recommend using AMF to pass your data back and forth. this allows you to pass objects and arrays of objects both ways. No need to convert objects to XML and back to objects - they are all just objects. When the data comes in you can use ArrayUtil.toArray on the result and create an ArrayCollection from this array. An empty result will have created a zero length array and you can trap on that. I use WebORB for PHP (Community Edition which is free) as the PHP middleware and have never had a problem. I have posted many examples on this forum of how to pass data back and forth. If you need any further help, I am but a post away ;-} I started out in my Flex learning going the XML route but soon got very confused, especially with trying to send arrays of data TO the server. As soon as I figured out how to do it with AMF I converted everything and now will not go back. Best Regards Steve
[flexcoders] Re: Problems With my XML Created Array Collection
Maybe a combination of Server based and locally saved preferences? This is what I do. The user can set his/her own display preferences which are saved in SharedObjects and the data is retrieved from the server. --- In flexcoders@yahoogroups.com, Gary Moorcroft garymoorcroft_...@... wrote: Actually the whole app was previously made entirely using shared objects with no web based dynamic data where the user could save all of the links to their local machine. The problem was of course my client wanted to add new links and update the existing links as time went on which means obviously it needs to all be web based. --- On Wed, 21/4/10, valdhor valdhorli...@... wrote: From: valdhor valdhorli...@... Subject: [flexcoders] Re: Problems With my XML Created Array Collection To: flexcoders@yahoogroups.com Date: Wednesday, 21 April, 2010, 13:49  James First off, I would not use AMFPHP as it is deprecated in favor of ZendAMF (Part of Zend Framework). I found WebORB much easier to integrate than ZendAMF. With WebORB you use Object Oriented PHP. You create data transfer classes in both Flex and PHP and map them to each other. then you use class hinting in PHP to receive data from Flex. You can definitely send the arraycollection to PHP. It will arrive as an array of objects. One thing I think you should look into is SharedObjects in Flex. This allows you to save data to the local machine (Kind of like cookies but you have 100K of space you can use) and is very useful to hold these kinds of preferences. Steve --- In flexcod...@yahoogro ups.com, James garymoorcroft_ ict@ wrote: Hi Steve. As I said earlier about using e4x I'm reluctant to use amfphp 1. because I already have eveything set up using regular php code and 2. I. struggle to find examples of how to use such methods compared to the regular methods of using traditional php. Would you happen to know if it is possible to send a copy of the array collection that I'm receiving somehow? I basically want it so that when the user logs in it gets the data that we've been discussing throughout this topic and sets it as an array collection in flex and then sends this whole array to the userlinks table I have in my mysql so each user basically has a whole copy of the links table to themselves and can edit this by setting favourites etc. How would you go about this judging by the code that I've got here (the code that Robert provided). I'd prefer to stick to php to upload the array as this project is for my uni course in which I've used php throughout but I suppose I could use amfphp to upload the arrays? Cheers for the advice so far. --- In flexcod...@yahoogro ups.com, valdhor valdhorlists@ wrote: I am a little late to this party but I would have to recommend using AMF to pass your data back and forth. this allows you to pass objects and arrays of objects both ways. No need to convert objects to XML and back to objects - they are all just objects. When the data comes in you can use ArrayUtil.toArray on the result and create an ArrayCollection from this array. An empty result will have created a zero length array and you can trap on that. I use WebORB for PHP (Community Edition which is free) as the PHP middleware and have never had a problem. I have posted many examples on this forum of how to pass data back and forth. If you need any further help, I am but a post away ;-} I started out in my Flex learning going the XML route but soon got very confused, especially with trying to send arrays of data TO the server. As soon as I figured out how to do it with AMF I converted everything and now will not go back. Best Regards Steve
Re: [flexcoders] Re: Problems With my XML Created Array Collection
Actually the whole app was previously made entirely using shared objects with no web based dynamic data where the user could save all of the links to their local machine. The problem was of course my client wanted to add new links and update the existing links as time went on which means obviously it needs to all be web based. --- On Wed, 21/4/10, valdhor valdhorli...@embarqmail.com wrote: From: valdhor valdhorli...@embarqmail.com Subject: [flexcoders] Re: Problems With my XML Created Array Collection To: flexcoders@yahoogroups.com Date: Wednesday, 21 April, 2010, 13:49 James First off, I would not use AMFPHP as it is deprecated in favor of ZendAMF (Part of Zend Framework). I found WebORB much easier to integrate than ZendAMF. With WebORB you use Object Oriented PHP. You create data transfer classes in both Flex and PHP and map them to each other. then you use class hinting in PHP to receive data from Flex. You can definitely send the arraycollection to PHP. It will arrive as an array of objects. One thing I think you should look into is SharedObjects in Flex. This allows you to save data to the local machine (Kind of like cookies but you have 100K of space you can use) and is very useful to hold these kinds of preferences. Steve --- In flexcod...@yahoogro ups.com, James garymoorcroft_ i...@... wrote: Hi Steve. As I said earlier about using e4x I'm reluctant to use amfphp 1. because I already have eveything set up using regular php code and 2. I. struggle to find examples of how to use such methods compared to the regular methods of using traditional php. Would you happen to know if it is possible to send a copy of the array collection that I'm receiving somehow? I basically want it so that when the user logs in it gets the data that we've been discussing throughout this topic and sets it as an array collection in flex and then sends this whole array to the userlinks table I have in my mysql so each user basically has a whole copy of the links table to themselves and can edit this by setting favourites etc. How would you go about this judging by the code that I've got here (the code that Robert provided). I'd prefer to stick to php to upload the array as this project is for my uni course in which I've used php throughout but I suppose I could use amfphp to upload the arrays? Cheers for the advice so far. --- In flexcod...@yahoogro ups.com, valdhor valdhorlists@ wrote: I am a little late to this party but I would have to recommend using AMF to pass your data back and forth. this allows you to pass objects and arrays of objects both ways. No need to convert objects to XML and back to objects - they are all just objects. When the data comes in you can use ArrayUtil.toArray on the result and create an ArrayCollection from this array. An empty result will have created a zero length array and you can trap on that. I use WebORB for PHP (Community Edition which is free) as the PHP middleware and have never had a problem. I have posted many examples on this forum of how to pass data back and forth. If you need any further help, I am but a post away ;-} I started out in my Flex learning going the XML route but soon got very confused, especially with trying to send arrays of data TO the server. As soon as I figured out how to do it with AMF I converted everything and now will not go back. Best Regards Steve
[flexcoders] Re: Problems With my XML Created Array Collection
--- In flexcoders@yahoogroups.com, valdhor valdhorli...@... wrote: James First off, I would not use AMFPHP as it is deprecated in favor of ZendAMF (Part of Zend Framework). I found WebORB much easier to integrate than ZendAMF. With WebORB you use Object Oriented PHP. You create data transfer classes in both Flex and PHP and map them to each other. then you use class hinting in PHP to receive data from Flex. You can definitely send the arraycollection to PHP. It will arrive as an array of objects. One thing I think you should look into is SharedObjects in Flex. This allows you to save data to the local machine (Kind of like cookies but you have 100K of space you can use) and is very useful to hold these kinds of preferences. I would disagree that AMFPHP is deprecated... They just released a new version in February. -Amy
[flexcoders] Re: Problems With my XML Created Array Collection
--- In flexcoders@yahoogroups.com, James garymoorcroft_...@... wrote: Hi Amy. Sorry I missed your post yesterday. e4x does seem good but I was just a little bit worried about implementing it. As a flex beginner I tend to stick to the traditional most widely used methods of doing things as a lot of the times I work by looking at previous examples and applying them to my own code and it's hard to find examples of things such as handling results of e4x etc. Hi, James; If you want to do things in the traditional most widely used method, then you _definitely_ want to go with using e4x. To be blunt, what Robert has told you to do is a newbie workaround, which could easily have been avoided by just using e4x. It's unfortunate that object is the default return type for HTTPService, but it's very easy and quick to figure out how to fix it, especially if you read the FAQ's for this group. When you have a ton of extra code to implement an unnecessary workaround, it's just that much more code to maintain, bloats your file size, and slows performance. And, as Tracy says, in this particular instance, you also risk your data integrity. If you're worried about working with e4x, I found this guide very helpful when I first was learning it http://dispatchevent.org/roger/as3-e4x-rundown/. However, I'd agree with Steve that if you need to pass data both ways, you're probably better off using RPC remoting. If you're interested in AMFPHP, you can get a fully working example here: http://flexdiary.blogspot.com/2009/01/lazy-loading-tree-example-file-posted.html HTH; Amy
[flexcoders] Re: Problems With my XML Created Array Collection
Amy That I didn't know. AMFPHP is probably a viable option then, especially seeing as it is being updated. I left AMFPHP behind once I went with WebORB and have never looked back until now. --- In flexcoders@yahoogroups.com, Amy amyblankens...@... wrote: --- In flexcoders@yahoogroups.com, valdhor valdhorlists@ wrote: James First off, I would not use AMFPHP as it is deprecated in favor of ZendAMF (Part of Zend Framework). I found WebORB much easier to integrate than ZendAMF. With WebORB you use Object Oriented PHP. You create data transfer classes in both Flex and PHP and map them to each other. then you use class hinting in PHP to receive data from Flex. You can definitely send the arraycollection to PHP. It will arrive as an array of objects. One thing I think you should look into is SharedObjects in Flex. This allows you to save data to the local machine (Kind of like cookies but you have 100K of space you can use) and is very useful to hold these kinds of preferences. I would disagree that AMFPHP is deprecated... They just released a new version in February. -Amy
RE: [flexcoders] Re: Problems With my XML Created Array Collection
I know this is very late in the game, and I haven’t read the full thread, but
this seems like a very complicated solution to the problem. Further, the
default resultFormat has other consequences, data type conversions for example.
If you have a string that looks like a number, it will get converted to a
number, removing trailing and leading zeros and such, and sometimes this is not
desired.
Using e4x and looping over the categories.category XMLList is very simple.
XMLLists are never null, but empty nodes just result in a zero length, which is
easy to test for.
Tracy Spratt
_
From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On Behalf
Of James
Sent: Monday, April 19, 2010 3:39 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
I've noticed that if I remove all items from the mysql table which populates
the remote xml file the xml that is produced is simply this:-
?xml version=1.0 ?
categories /
i.e. all of the nodes are removed so this means my app is looking for nodes
that aren't actually there so it seems I need another else if bracket to deal
with this but I haven't got a clue for how to check if an xml file is empty or
null or whatever you'd call the above in flex and what to do within this else
if bracket if it's not.
--- In flexcod...@yahoogro mailto:flexcoders%40yahoogroups.com ups.com,
Robert Moss rdm0...@... wrote:
In essence yes, I do not think I would do it as part of the button click, but
instead clear it before the IF in the result handler with LinksFullAC.source
= new Array(); or LinksFullAC.removeAll(); I prefer the former.
As for your error, I'm not sure what's happening, but you should be able to
set a break in the result handler and see what is getting returned. It looks
like for the combination you describe, categories is not getting returned for
some reason. You'll need to figure out why and trap for it. The same goes for
returning 0 records. See what is getting returned and trap for it.
From: James garymoorcroft_...@...
To: flexcod...@yahoogro mailto:flexcoders%40yahoogroups.com ups.com
Sent: Mon, April 19, 2010 12:47:15 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
Hi Robert. Thanks so much for that my friend.
I have some problems with it though. You see I have an event in my app
applied to a button (refresh button) which resends data via the LinksService
i.e. LinksService. send and I've noticed that with your code if there is only
1 link i.e. 1 node and I click the refresh button it seems to keep recreating
that 1 over and over again as if it's recreating the same object in the array
collection or something. This doesn't happen if their are 2 or more
links/nodes/ objects. Perhaps I'll have to get the refresh button to empty
the array collection first before sending the data i.e. it's click function
would be LinksFullAC. flush; LinksService. send() Am I right?
I've also noticed now with your code applied if I select an item in the
tilelist and click the reresh button I get the error Property categories not
found on String and there is no default value which is indicating the error
at the if statement in the code you gave me and the LinksService itself. Any
idea what's causing this?
Another question though what if the xml contains no nodes?
You see my xml file is dynamic, I have a variable in my app called categoryid
and that variable is based on a category that the user selects in my app and
is submitted to getlinks.php which gets all the records from my mysql table
which contain that specific submitted categoryid and output them as the xml
file. Some categoryids have no records (the user can add and delte records
via my app). Is there any way of getting it to handle 0 records/nodes as well
as handling muliple records/1record which it seems to already do?
Thanks so much for your help. Sorry to be a pain :-(
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0004@ wrote:
This is not exactly how I would implement, but you should get the idea. If
you have multiple category nodes, then your LinksService. lastResult.
categories. category is returned as an ArrayCollection and your code works.
If it only has one node then LinksService. lastResult. categories. category
is returned as an ObjectProxy. So in your return method you could have the
following.
if(LinksService. lastResult. categories. category is ArrayCollection) {
LinksFullAC= LinksService. lastResult. categories. category as
ArrayCollection;
}else
{
var oCat:Object = new Object();
oCat.id = LinksService. lastResult. categories. category. id;
oCat.label = LinksService. lastResult. categories. category. label;
oCat.icon = LinksService. lastResult. categories. category. icon;
LinksFullAC. addItem(oCat) ; // NOTE
RE: [flexcoders] Re: Problems With my XML Created Array Collection
Here is some untested code to loop (you will need to correct the automatic
capitalization ): It is also more verbose than necessary, just for clarity.
Var xmlResult:XML = event.result as XML;
Trace(xmlResult.toXMLString()); //to verify your xml
Var xlResult:XMLList = xmlResult.category;
Var acResult:ArrayCollection = new ArrayCollection();
Var xmlCategory:XML;
For (var i:uint=0;ixlResult.length()) { //watch out for the length() method,
not property
xmlCategory = xlResult[i];
acResult.addItem({id:xmlCategory.id.text(),label:xmlCategory.label.text(),icon:xmlCategory.icon.text()});
//usually the text) can be omitted, but I use it by habit.
}
myTileList.dataProvider = acResult;
And DO avoid using lastResult in functions. It is intended for binding
espressions.
Tracy Spratt,
Lariat Services, development services available
_
From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On Behalf
Of Tracy Spratt
Sent: Tuesday, April 20, 2010 12:39 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Re: Problems With my XML Created Array Collection
I know this is very late in the game, and I haven’t read the full thread, but
this seems like a very complicated solution to the problem. Further, the
default resultFormat has other consequences, data type conversions for example.
If you have a string that looks like a number, it will get converted to a
number, removing trailing and leading zeros and such, and sometimes this is not
desired.
Using e4x and looping over the categories.category XMLList is very simple.
XMLLists are never null, but empty nodes just result in a zero length, which is
easy to test for.
Tracy Spratt
_
From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On Behalf
Of James
Sent: Monday, April 19, 2010 3:39 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
I've noticed that if I remove all items from the mysql table which populates
the remote xml file the xml that is produced is simply this:-
?xml version=1.0 ?
categories /
i.e. all of the nodes are removed so this means my app is looking for nodes
that aren't actually there so it seems I need another else if bracket to deal
with this but I haven't got a clue for how to check if an xml file is empty or
null or whatever you'd call the above in flex and what to do within this else
if bracket if it's not.
--- In flexcod...@yahoogro mailto:flexcoders%40yahoogroups.com ups.com,
Robert Moss rdm0...@... wrote:
In essence yes, I do not think I would do it as part of the button click, but
instead clear it before the IF in the result handler with LinksFullAC.source
= new Array(); or LinksFullAC.removeAll(); I prefer the former.
As for your error, I'm not sure what's happening, but you should be able to
set a break in the result handler and see what is getting returned. It looks
like for the combination you describe, categories is not getting returned for
some reason. You'll need to figure out why and trap for it. The same goes for
returning 0 records. See what is getting returned and trap for it.
From: James garymoorcroft_...@...
To: flexcod...@yahoogro mailto:flexcoders%40yahoogroups.com ups.com
Sent: Mon, April 19, 2010 12:47:15 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
Hi Robert. Thanks so much for that my friend.
I have some problems with it though. You see I have an event in my app
applied to a button (refresh button) which resends data via the LinksService
i.e. LinksService. send and I've noticed that with your code if there is only
1 link i.e. 1 node and I click the refresh button it seems to keep recreating
that 1 over and over again as if it's recreating the same object in the array
collection or something. This doesn't happen if their are 2 or more
links/nodes/ objects. Perhaps I'll have to get the refresh button to empty
the array collection first before sending the data i.e. it's click function
would be LinksFullAC. flush; LinksService. send() Am I right?
I've also noticed now with your code applied if I select an item in the
tilelist and click the reresh button I get the error Property categories not
found on String and there is no default value which is indicating the error
at the if statement in the code you gave me and the LinksService itself. Any
idea what's causing this?
Another question though what if the xml contains no nodes?
You see my xml file is dynamic, I have a variable in my app called categoryid
and that variable is based on a category that the user selects in my app and
is submitted to getlinks.php which gets all the records from my mysql table
which contain that specific submitted categoryid and output them as the xml
file. Some categoryids have no records (the user can add and delte records
[flexcoders] Re: Problems With my XML Created Array Collection
--- In flexcoders@yahoogroups.com, Robert Moss rdm0...@... wrote: Yes use a third if statement like: if(event.result.categories) if(event.result.categories != null) should also work Notice I used event.result instead of LinksService.lastResult. Small change, but you should get in the habit as LinksService.lastResult will cause some pain in the future if you decide to change it's name for some reason. Amy suggested using e4x which is probably the correct answer as e4x grants you consistency ( you do not have the arrayCollection returned sometimes and ObjectProxy others) and allows you to work with XML in actionscript like XML was meant to be accessed. You will still have to trap for the same issues, just implemented in a different way. We do not always use e4x although we probably should, being lazy will probably bite us one of these days. I think you've misunderstood. By changing the result format from the default of object to e4x, you _avoid_ the problem the OP had, which is if there is only one object returned, you get a different result than if you have multiple objects returned. You don't have to trap for the problem, because it goes away. If there is only one node, you get one node. If there are multiple nodes, you get multiple nodes. But whatever. -Amy
[flexcoders] Re: Problems With my XML Created Array Collection
Thanks Tracy that looks good. I may try something similar in the future. I've
managed to get the previous example provided by robert working though so
basically I'm thinking if it isn't broke don't fix it. :-) It's all that I
require really as I'm only using it to display the results and it covers
everything I need. Thanks a lot for your advice.
While you're hear would you happen to know how to upload an entire array
collection to a server via php/http request? You see the thing is at the moment
I have an app which allows users to create links and remove links which
directly creates/removes them in the mysql database I have which holds my data.
To explain what I want basically I have a links table which contains all the
available links and a userlinks table in my mysql database. When the user
creates a new account via my app all the links from the links table are
displayed in the app using the method we've been discussing but now I want the
user to be able to add the entire contents of this to the userlinks table. The
purpose of this is the user can favorite each link which will alter a boolean
field in the userlinks table which will mean in turn when a user logs in with
an existing account the links they've favourited will be displayed.
So basically firstly I need to know how to add/send mulitple records via
flex/php. I have no problem adding/removing and updating individual records but
I now need to know how to add multiple ones at once. Is there any way of doing
this and do you know of any similar examples?
--- In flexcoders@yahoogroups.com, Tracy Spratt tr...@... wrote:
Here is some untested code to loop (you will need to correct the automatic
capitalization ): It is also more verbose than necessary, just for clarity.
Var xmlResult:XML = event.result as XML;
Trace(xmlResult.toXMLString()); //to verify your xml
Var xlResult:XMLList = xmlResult.category;
Var acResult:ArrayCollection = new ArrayCollection();
Var xmlCategory:XML;
For (var i:uint=0;ixlResult.length()) { //watch out for the length() method,
not property
xmlCategory = xlResult[i];
acResult.addItem({id:xmlCategory.id.text(),label:xmlCategory.label.text(),icon:xmlCategory.icon.text()});
//usually the text) can be omitted, but I use it by habit.
}
myTileList.dataProvider = acResult;
And DO avoid using lastResult in functions. It is intended for binding
espressions.
Tracy Spratt,
Lariat Services, development services available
_
From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On
Behalf Of Tracy Spratt
Sent: Tuesday, April 20, 2010 12:39 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Re: Problems With my XML Created Array Collection
I know this is very late in the game, and I havenât read the full thread,
but this seems like a very complicated solution to the problem. Further, the
default resultFormat has other consequences, data type conversions for
example. If you have a string that looks like a number, it will get
converted to a number, removing trailing and leading zeros and such, and
sometimes this is not desired.
Using e4x and looping over the categories.category XMLList is very simple.
XMLLists are never null, but empty nodes just result in a zero length, which
is easy to test for.
Tracy Spratt
_
From: flexcoders@yahoogroups.com [mailto:flexcod...@yahoogroups.com] On
Behalf Of James
Sent: Monday, April 19, 2010 3:39 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
I've noticed that if I remove all items from the mysql table which populates
the remote xml file the xml that is produced is simply this:-
?xml version=1.0 ?
categories /
i.e. all of the nodes are removed so this means my app is looking for nodes
that aren't actually there so it seems I need another else if bracket to deal
with this but I haven't got a clue for how to check if an xml file is empty
or null or whatever you'd call the above in flex and what to do within this
else if bracket if it's not.
--- In flexcod...@yahoogro mailto:flexcoders%40yahoogroups.com ups.com,
Robert Moss rdm0004@ wrote:
In essence yes, I do not think I would do it as part of the button click,
but instead clear it before the IF in the result handler with
LinksFullAC.source = new Array(); or LinksFullAC.removeAll(); I prefer the
former.
As for your error, I'm not sure what's happening, but you should be able to
set a break in the result handler and see what is getting returned. It
looks like for the combination you describe, categories is not getting
returned for some reason. You'll need to figure out why and trap for it.
The same goes for returning 0 records. See what is getting returned and
trap
[flexcoders] Re: Problems With my XML Created Array Collection
Hi Amy. Sorry I missed your post yesterday. e4x does seem good but I was just a little bit worried about implementing it. As a flex beginner I tend to stick to the traditional most widely used methods of doing things as a lot of the times I work by looking at previous examples and applying them to my own code and it's hard to find examples of things such as handling results of e4x etc. Cheers. --- In flexcoders@yahoogroups.com, Amy amyblankens...@... wrote: --- In flexcoders@yahoogroups.com, Robert Moss rdm0004@ wrote: Yes use a third if statement like: if(event.result.categories) if(event.result.categories != null) should also work Notice I used event.result instead of LinksService.lastResult. Small change, but you should get in the habit as LinksService.lastResult will cause some pain in the future if you decide to change it's name for some reason. Amy suggested using e4x which is probably the correct answer as e4x grants you consistency ( you do not have the arrayCollection returned sometimes and ObjectProxy others) and allows you to work with XML in actionscript like XML was meant to be accessed. You will still have to trap for the same issues, just implemented in a different way. We do not always use e4x although we probably should, being lazy will probably bite us one of these days. I think you've misunderstood. By changing the result format from the default of object to e4x, you _avoid_ the problem the OP had, which is if there is only one object returned, you get a different result than if you have multiple objects returned. You don't have to trap for the problem, because it goes away. If there is only one node, you get one node. If there are multiple nodes, you get multiple nodes. But whatever. -Amy
[flexcoders] Re: Problems With my XML Created Array Collection
return the xml as a string from PHP file and cast that return string
in flex like this var xml:XML = XML(data.result);
then do whatever it needs like XMLList and XMLListCollection;
then is the resultEvent you can check like this
if (data.result != )
{
xml:XML = XML(data.result);
}
else
{
Alert.show(something);
}
--- In flexcoders@yahoogroups.com, James garymoorcroft_...@... wrote:
In my app I have an array collection which populates a tilelist. This array
collection is populated by a remote xml file via a http request. Problem is
if the xml only has 1 or no nodes I get a null object reference error. I know
this is a known problem but I've never been able to find a valid solution for
it which could be applied to my code. I've heard of looping through the xml
to create an array collection or using xmllist collection but I don't know
how these can be done whilst still allowing the data to be displayed in the
tilelist. Can anyone help me out please?
The code for my httpservice, array collcection I'm trying to make and the
result of the http service and the tilelist it populates is shown below. As I
say this all works fine as long as the xml has more than 1 node but causes
the error if it doesn't:-
mx:HTTPService id=LinksService result=linksResultHandler(event)
resultFormat=object method=POST
url=http://www.coolvisiontest.com/getlinks.php/
mx:Script
![CDATA[
import mx.rpc.events.ResultEvent;
import mx.collections.ArrayCollection;
[Bindable] private var LinksFullAC:ArrayCollection;
private function linksResultHandler(event:ResultEvent):void
{
LinksFullAC=LinksService.lastResult.categories.category
as ArrayCollection;
}
]]
/mx:Script
mx:TileList id=linkChoice dataProvider={LinksFullAC} height=365
width=665/
Here's my xml structure:-
categories
category
id/id
label/label
icon/icon
/category
/categories
Obviously I need the array collection to be populated by id, label and icon.
Thanks for any suggestions.
[flexcoders] Re: Problems With my XML Created Array Collection
The thing is my xml is retrieved from a mysql database table which sometimes
will have no records or 1 record which will mean the xml will have only 1 or no
nodes which in turn causes the problem whereas sometimes it has many records
therefore the xml file would have many nodes which would mean no problems.
I've heard of looping but can't figure out how to do it or apply it to my code.
I've tried simply changing the array collection to xmllist collection but then
the data doesn't seem to appear in my tilelist.
How would you loop using my specific code there because I always need it
returned as an array collection to populate the tilelist but have no idea how
to loop?
Cheers for your help so far.
--- In flexcoders@yahoogroups.com, Robert Moss rdm0...@... wrote:
We had the same issue, and in our case it was an easy fix. When we read in
the XML it was returning as an ArrayCollection as long as there were multiple
nodes. As you have found, if it was only one node it returned as a generic
object not an ArrayCollection. We were already looping through the
ArrayCollection to populate value objects that we were using to populate our
list. So before the loop we added, if xmlObject is an ArrayCollection than
loop else populate VO with returned data. Worked without issues ever since.
Robert
From: thomas parquier mailingli...@...
To: flexcoders@yahoogroups.com
Sent: Mon, April 19, 2010 9:27:13 AM
Subject: Re: [flexcoders] Problems With my XML Created Array Collection
what about xmllistcollection ?;
---
thomas parquier
http://www.web- attitude. fr/realisations/
msn : thomas.parquier@ web-attitude. fr
softphone : sip:webattitude@ ekiga.net
téléphone portable : +33601 822 056
2010/4/19 James garymoorcroft_ i...@yahoo. co.uk
In my app I have an array collection which populates a tilelist. This array
collection is populated by a remote xml file via a http request. Problem is
if the xml only has 1 or no nodes I get a null object reference error. I
know this is a known problem but I've never been able to find a valid
solution for it which could be applied to my code. I've heard of looping
through the xml to create an array collection or using xmllist collection
but I don't know how these can be done whilst still allowing the data to be
displayed in the tilelist. Can anyone help me out please?
The code for my httpservice, array collcection I'm trying to make and the
result of the http service and the tilelist it populates is shown below. As
I say this all works fine as long as the xml has more than 1 node but
causes the error if it doesn't:-
mx:HTTPService id=LinksService result=linksResultHandler( event)
resultFormat=object method=POST url=http://www.coolvisi ontest.com/
getlinks. php/
mx:Script
![CDATA[
import mx.rpc.events. ResultEvent;
import mx.collections. ArrayCollection;
[Bindable] private var LinksFullAC: ArrayCollection;
private function linksResultHandler( event:ResultEven t):void
{
LinksFullAC= LinksService. lastResult. categories.
category as ArrayCollection;
}
]]
/mx:Script
mx:TileList id=linkChoice dataProvider={LinksFullAC} height=365
width=665/
Here's my xml structure:-
categories
category
id/id
label/label
icon/icon
/category
/categories
Obviously I need the array collection to be populated by id, label and icon.
Thanks for any suggestions.
Re: [flexcoders] Re: Problems With my XML Created Array Collection
This is not exactly how I would implement, but you should get the idea. If you
have multiple category nodes, then your
LinksService.lastResult.categories.category is returned as an ArrayCollection
and your code works. If it only has one node then
LinksService.lastResult.categories.category is returned as an ObjectProxy. So
in your return method you could have the following.
if(LinksService.lastResult.categories.category is ArrayCollection){
LinksFullAC=LinksService.lastResult.categories.category as
ArrayCollection;
}else
{
var oCat:Object = new Object();
oCat.id = LinksService.lastResult.categories.category.id;
oCat.label = LinksService.lastResult.categories.category.label;
oCat.icon = LinksService.lastResult.categories.category.icon;
LinksFullAC.addItem(oCat); // NOTE: LinksFullAC needs to not only be
previously declared, but must also me instantiated with new ArrayCollection()
for this line to work.
}
From: James garymoorcroft_...@yahoo.co.uk
To: flexcoders@yahoogroups.com
Sent: Mon, April 19, 2010 9:58:33 AM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
The thing is my xml is retrieved from a mysql database table which sometimes
will have no records or 1 record which will mean the xml will have only 1 or no
nodes which in turn causes the problem whereas sometimes it has many records
therefore the xml file would have many nodes which would mean no problems.
I've heard of looping but can't figure out how to do it or apply it to my code.
I've tried simply changing the array collection to xmllist collection but then
the data doesn't seem to appear in my tilelist.
How would you loop using my specific code there because I always need it
returned as an array collection to populate the tilelist but have no idea how
to loop?
Cheers for your help so far.
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0...@... wrote:
We had the same issue, and in our case it was an easy fix. When we read in
the XML it was returning as an ArrayCollection as long as there were multiple
nodes. As you have found, if it was only one node it returned as a generic
object not an ArrayCollection. We were already looping through the
ArrayCollection to populate value objects that we were using to populate our
list. So before the loop we added, if xmlObject is an ArrayCollection than
loop else populate VO with returned data. Worked without issues ever since.
Robert
_ _ __
From: thomas parquier mailinglists@ ...
To: flexcod...@yahoogro ups.com
Sent: Mon, April 19, 2010 9:27:13 AM
Subject: Re: [flexcoders] Problems With my XML Created Array Collection
what about xmllistcollection ?;
---
thomas parquier
http://www.web- attitude. fr/realisations/
msn : thomas.parquier@ web-attitude. fr
softphone : sip:webattitude@ ekiga.net
téléphone portable : +33601 822 056
2010/4/19 James garymoorcroft_ i...@yahoo. co.uk
In my app I have an array collection which populates a tilelist. This array
collection is populated by a remote xml file via a http request. Problem is
if the xml only has 1 or no nodes I get a null object reference error. I
know this is a known problem but I've never been able to find a valid
solution for it which could be applied to my code. I've heard of looping
through the xml to create an array collection or using xmllist collection
but I don't know how these can be done whilst still allowing the data to be
displayed in the tilelist. Can anyone help me out please?
The code for my httpservice, array collcection I'm trying to make and the
result of the http service and the tilelist it populates is shown below. As
I say this all works fine as long as the xml has more than 1 node but
causes the error if it doesn't:-
http://www.coolvisi ontest.com/ getlinks. php/
mx:Script
![CDATA[
import mx.rpc.events. ResultEvent;
import mx.collections. ArrayCollection;
[Bindable] private var LinksFullAC: ArrayCollection;
private function linksResultHandler( event:ResultEven t):void
{
LinksFullAC= LinksService. lastResult. categories.
category as ArrayCollection;
}
]]
/mx:Script
mx:TileList id=linkChoice dataProvider= {LinksFullAC} height=365
width=665/
Here's my xml structure:-
categories
category
id/id
label/label
icon/icon
/category
/categories
Obviously I need the array collection to be populated by id, label and icon.
Thanks for any suggestions.
[flexcoders] Re: Problems With my XML Created Array Collection
Hi Robert. Thanks so much for that my friend.
I have some problems with it though. You see I have an event in my app applied
to a button (refresh button) which resends data via the LinksService i.e.
LinksService.send and I've noticed that with your code if there is only 1 link
i.e. 1 node and I click the refresh button it seems to keep recreating that 1
over and over again as if it's recreating the same object in the array
collection or something. This doesn't happen if their are 2 or more
links/nodes/objects. Perhaps I'll have to get the refresh button to empty the
array collection first before sending the data i.e. it's click function would
be LinksFullAC.flush; LinksService.send() Am I right?
I've also noticed now with your code applied if I select an item in the
tilelist and click the reresh button I get the error Property categories not
found on String and there is no default value which is indicating the error at
the if statement in the code you gave me and the LinksService itself. Any idea
what's causing this?
Another question though what if the xml contains no nodes?
You see my xml file is dynamic, I have a variable in my app called categoryid
and that variable is based on a category that the user selects in my app and is
submitted to getlinks.php which gets all the records from my mysql table which
contain that specific submitted categoryid and output them as the xml file.
Some categoryids have no records (the user can add and delte records via my
app). Is there any way of getting it to handle 0 records/nodes as well as
handling muliple records/1record which it seems to already do?
Thanks so much for your help. Sorry to be a pain :-(
--- In flexcoders@yahoogroups.com, Robert Moss rdm0...@... wrote:
This is not exactly how I would implement, but you should get the idea. If
you have multiple category nodes, then your
LinksService.lastResult.categories.category is returned as an ArrayCollection
and your code works. If it only has one node then
LinksService.lastResult.categories.category is returned as an ObjectProxy.
So in your return method you could have the following.
if(LinksService.lastResult.categories.category is ArrayCollection){
LinksFullAC=LinksService.lastResult.categories.category as
ArrayCollection;
}else
{
var oCat:Object = new Object();
oCat.id = LinksService.lastResult.categories.category.id;
oCat.label = LinksService.lastResult.categories.category.label;
oCat.icon = LinksService.lastResult.categories.category.icon;
LinksFullAC.addItem(oCat); // NOTE: LinksFullAC needs to not only
be previously declared, but must also me instantiated with new
ArrayCollection() for this line to work.
}
From: James garymoorcroft_...@...
To: flexcoders@yahoogroups.com
Sent: Mon, April 19, 2010 9:58:33 AM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
The thing is my xml is retrieved from a mysql database table which sometimes
will have no records or 1 record which will mean the xml will have only 1 or
no nodes which in turn causes the problem whereas sometimes it has many
records therefore the xml file would have many nodes which would mean no
problems.
I've heard of looping but can't figure out how to do it or apply it to my
code. I've tried simply changing the array collection to xmllist collection
but then the data doesn't seem to appear in my tilelist.
How would you loop using my specific code there because I always need it
returned as an array collection to populate the tilelist but have no idea how
to loop?
Cheers for your help so far.
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0004@ wrote:
We had the same issue, and in our case it was an easy fix. When we read in
the XML it was returning as an ArrayCollection as long as there were
multiple nodes. As you have found, if it was only one node it returned as
a generic object not an ArrayCollection. We were already looping through
the ArrayCollection to populate value objects that we were using to
populate our list. So before the loop we added, if xmlObject is an
ArrayCollection than loop else populate VO with returned data. Worked
without issues ever since.
Robert
_ _ __
From: thomas parquier mailinglists@ ...
To: flexcod...@yahoogro ups.com
Sent: Mon, April 19, 2010 9:27:13 AM
Subject: Re: [flexcoders] Problems With my XML Created Array Collection
what about xmllistcollection ?;
---
thomas parquier
http://www.web- attitude. fr/realisations/
msn : thomas.parquier@ web-attitude. fr
softphone : sip:webattitude@ ekiga.net
téléphone portable : +33601 822 056
2010/4/19 James garymoorcroft_ i...@yahoo. co.uk
Re: [flexcoders] Re: Problems With my XML Created Array Collection
In essence yes, I do not think I would do it as part of the button click, but
instead clear it before the IF in the result handler with LinksFullAC.source =
new Array(); or LinksFullAC.removeAll(); I prefer the former.
As for your error, I'm not sure what's happening, but you should be able to set
a break in the result handler and see what is getting returned. It looks like
for the combination you describe, categories is not getting returned for some
reason. You'll need to figure out why and trap for it. The same goes for
returning 0 records. See what is getting returned and trap for it.
From: James garymoorcroft_...@yahoo.co.uk
To: flexcoders@yahoogroups.com
Sent: Mon, April 19, 2010 12:47:15 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
Hi Robert. Thanks so much for that my friend.
I have some problems with it though. You see I have an event in my app applied
to a button (refresh button) which resends data via the LinksService i.e.
LinksService. send and I've noticed that with your code if there is only 1 link
i.e. 1 node and I click the refresh button it seems to keep recreating that 1
over and over again as if it's recreating the same object in the array
collection or something. This doesn't happen if their are 2 or more
links/nodes/ objects. Perhaps I'll have to get the refresh button to empty the
array collection first before sending the data i.e. it's click function would
be LinksFullAC. flush; LinksService. send() Am I right?
I've also noticed now with your code applied if I select an item in the
tilelist and click the reresh button I get the error Property categories not
found on String and there is no default value which is indicating the error at
the if statement in the code you gave me and the LinksService itself. Any idea
what's causing this?
Another question though what if the xml contains no nodes?
You see my xml file is dynamic, I have a variable in my app called categoryid
and that variable is based on a category that the user selects in my app and is
submitted to getlinks.php which gets all the records from my mysql table which
contain that specific submitted categoryid and output them as the xml file.
Some categoryids have no records (the user can add and delte records via my
app). Is there any way of getting it to handle 0 records/nodes as well as
handling muliple records/1record which it seems to already do?
Thanks so much for your help. Sorry to be a pain :-(
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0...@... wrote:
This is not exactly how I would implement, but you should get the idea. If
you have multiple category nodes, then your LinksService. lastResult.
categories. category is returned as an ArrayCollection and your code works.
If it only has one node then LinksService. lastResult. categories. category
is returned as an ObjectProxy. So in your return method you could have the
following.
if(LinksService. lastResult. categories. category is ArrayCollection) {
LinksFullAC= LinksService. lastResult. categories. category as
ArrayCollection;
}else
{
var oCat:Object = new Object();
oCat.id = LinksService. lastResult. categories. category. id;
oCat.label = LinksService. lastResult. categories. category. label;
oCat.icon = LinksService. lastResult. categories. category. icon;
LinksFullAC. addItem(oCat) ; // NOTE: LinksFullAC needs to not only
be previously declared, but must also me instantiated with new
ArrayCollection( ) for this line to work.
}
_ _ __
From: James garymoorcroft_ i...@...
To: flexcod...@yahoogro ups.com
Sent: Mon, April 19, 2010 9:58:33 AM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
The thing is my xml is retrieved from a mysql database table which sometimes
will have no records or 1 record which will mean the xml will have only 1 or
no nodes which in turn causes the problem whereas sometimes it has many
records therefore the xml file would have many nodes which would mean no
problems.
I've heard of looping but can't figure out how to do it or apply it to my
code. I've tried simply changing the array collection to xmllist collection
but then the data doesn't seem to appear in my tilelist.
How would you loop using my specific code there because I always need it
returned as an array collection to populate the tilelist but have no idea how
to loop?
Cheers for your help so far.
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0004@ wrote:
We had the same issue, and in our case it was an easy fix. When we read in
the XML it was returning as an ArrayCollection as long as there were
multiple nodes. As you have found, if it was only one node it returned as
a generic object not an ArrayCollection. We were already looping through
[flexcoders] Re: Problems With my XML Created Array Collection
--- In flexcoders@yahoogroups.com, James garymoorcroft_...@... wrote: The thing is my xml is retrieved from a mysql database table which sometimes will have no records or 1 record which will mean the xml will have only 1 or no nodes which in turn causes the problem whereas sometimes it has many records therefore the xml file would have many nodes which would mean no problems. I've heard of looping but can't figure out how to do it or apply it to my code. I've tried simply changing the array collection to xmllist collection but then the data doesn't seem to appear in my tilelist. How would you loop using my specific code there because I always need it returned as an array collection to populate the tilelist but have no idea how to loop? Try setting the result format to e4x. Probably no one stepped forward to answer this because it is covered in the FAQ ;-).
[flexcoders] Re: Problems With my XML Created Array Collection
You were right about removeall (flush ha whoops) helping. I applied removeall
before the if statements like you said and the first error is now gone.
The only problem I have now is the error which occurs when there are NO nodes
in the xml i.e. all items have been removed and there are no values in my mysql
table which relate to that specific category id.
I've changed the code to this:-
private function linksResultHandler(event:ResultEvent):void
{
LinksFullAC.removeAll();
if(LinksService.lastResult.categories.category is ArrayCollection) {
LinksFullAC=LinksService.lastResult.categories.category as
ArrayCollection;
}else if (LinksService.lastResult.categories.category is ObjectProxy)
{
var oCat:Object = new Object();
oCat.linkid =
LinksService.lastResult.categories.category.linkid;
oCat.categoryid =
LinksService.lastResult.categories.category.categoryid;
oCat.label = LinksService.lastResult.categories.category.label;
oCat.icon = LinksService.lastResult.categories.category.icon;
oCat.link = LinksService.lastResult.categories.category.link;
LinksFullAC.addItem(oCat);
}
}
The thing is though in that code I have the first if statement to check for if
the result is an array collection which sets it as an array collection, the
second if statement which if it is an object proxy adds the single object to
the array collection but I think what I'll need is a third if statement which
checks if the xml is empty/null or something and assign what will happen if it
is null. Do you know of any way to do this and if so what do you think is best
to set as the operation of such an if statement to make sure this error doesn't
occur anymore? I thought it might be something like:-
if(LinksService.lastResult.categories.category is null)
but there seems to be no such thing. Any ideas?
Sorry to keep hassling but it's pretty much the last hiccup I've got in my app
and I always try to pick the brains of guys who know their stuff as much as I
can :-)
--- In flexcoders@yahoogroups.com, Robert Moss rdm0...@... wrote:
In essence yes, I do not think I would do it as part of the button click, but
instead clear it before the IF in the result handler with LinksFullAC.source
= new Array(); or LinksFullAC.removeAll(); I prefer the former.
As for your error, I'm not sure what's happening, but you should be able to
set a break in the result handler and see what is getting returned. It looks
like for the combination you describe, categories is not getting returned for
some reason. You'll need to figure out why and trap for it. The same goes
for returning 0 records. See what is getting returned and trap for it.
From: James garymoorcroft_...@...
To: flexcoders@yahoogroups.com
Sent: Mon, April 19, 2010 12:47:15 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
Hi Robert. Thanks so much for that my friend.
I have some problems with it though. You see I have an event in my app
applied to a button (refresh button) which resends data via the LinksService
i.e. LinksService. send and I've noticed that with your code if there is only
1 link i.e. 1 node and I click the refresh button it seems to keep recreating
that 1 over and over again as if it's recreating the same object in the array
collection or something. This doesn't happen if their are 2 or more
links/nodes/ objects. Perhaps I'll have to get the refresh button to empty
the array collection first before sending the data i.e. it's click function
would be LinksFullAC. flush; LinksService. send() Am I right?
I've also noticed now with your code applied if I select an item in the
tilelist and click the reresh button I get the error Property categories not
found on String and there is no default value which is indicating the error
at the if statement in the code you gave me and the LinksService itself. Any
idea what's causing this?
Another question though what if the xml contains no nodes?
You see my xml file is dynamic, I have a variable in my app called categoryid
and that variable is based on a category that the user selects in my app and
is submitted to getlinks.php which gets all the records from my mysql table
which contain that specific submitted categoryid and output them as the xml
file. Some categoryids have no records (the user can add and delte records
via my app). Is there any way of getting it to handle 0 records/nodes as well
as handling muliple records/1record which it seems to already do?
Thanks so much for your help. Sorry to be a pain :-(
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0004@ wrote:
This is not exactly how I would implement, but you should get the idea. If
you have multiple category
Re: [flexcoders] Re: Problems With my XML Created Array Collection
Yes use a third if statement like: if(event.result.categories)
if(event.result.categories != null) should also work
Notice I used event.result instead of LinksService.lastResult. Small change,
but you should get in the habit as LinksService.lastResult will cause some pain
in the future if you decide to change it's name for some reason.
Amy suggested using e4x which is probably the correct answer as e4x grants you
consistency ( you do not have the arrayCollection returned sometimes and
ObjectProxy others) and allows you to work with XML in actionscript like XML
was meant to be accessed. You will still have to trap for the same issues,
just implemented in a different way. We do not always use e4x although we
probably should, being lazy will probably bite us one of these days.
From: James garymoorcroft_...@yahoo.co.uk
To: flexcoders@yahoogroups.com
Sent: Mon, April 19, 2010 2:11:16 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
You were right about removeall (flush ha whoops) helping. I applied removeall
before the if statements like you said and the first error is now gone.
The only problem I have now is the error which occurs when there are NO nodes
in the xml i.e. all items have been removed and there are no values in my mysql
table which relate to that specific category id.
I've changed the code to this:-
private function linksResultHandler( event:ResultEven t):void
{
LinksFullAC. removeAll( );
if(LinksService. lastResult. categories. category is ArrayCollection) {
LinksFullAC= LinksService. lastResult. categories. category as ArrayCollection;
}else if (LinksService. lastResult. categories. category is ObjectProxy)
{
var oCat:Object = new Object();
oCat.linkid = LinksService. lastResult. categories. category. linkid;
oCat.categoryid = LinksService. lastResult. categories. category. categoryid;
oCat.label = LinksService. lastResult. categories. category. label;
oCat.icon = LinksService. lastResult. categories. category. icon;
oCat.link = LinksService. lastResult. categories. category. link;
LinksFullAC. addItem(oCat) ;
}
}
The thing is though in that code I have the first if statement to check for if
the result is an array collection which sets it as an array collection, the
second if statement which if it is an object proxy adds the single object to
the array collection but I think what I'll need is a third if statement which
checks if the xml is empty/null or something and assign what will happen if it
is null. Do you know of any way to do this and if so what do you think is best
to set as the operation of such an if statement to make sure this error doesn't
occur anymore? I thought it might be something like:-
if(LinksService. lastResult. categories. category is null)
but there seems to be no such thing. Any ideas?
Sorry to keep hassling but it's pretty much the last hiccup I've got in my app
and I always try to pick the brains of guys who know their stuff as much as I
can :-)
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0...@... wrote:
In essence yes, I do not think I would do it as part of the button click, but
instead clear it before the IF in the result handler with LinksFullAC. source
= new Array(); or LinksFullAC. removeAll( ); I prefer the former.
As for your error, I'm not sure what's happening, but you should be able to
set a break in the result handler and see what is getting returned. It looks
like for the combination you describe, categories is not getting returned for
some reason. You'll need to figure out why and trap for it. The same goes
for returning 0 records. See what is getting returned and trap for it.
_ _ __
From: James garymoorcroft_ i...@...
To: flexcod...@yahoogro ups.com
Sent: Mon, April 19, 2010 12:47:15 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
Hi Robert. Thanks so much for that my friend.
I have some problems with it though. You see I have an event in my app
applied to a button (refresh button) which resends data via the LinksService
i.e. LinksService. send and I've noticed that with your code if there is only
1 link i.e. 1 node and I click the refresh button it seems to keep recreating
that 1 over and over again as if it's recreating the same object in the array
collection or something. This doesn't happen if their are 2 or more
links/nodes/ objects. Perhaps I'll have to get the refresh button to empty
the array collection first before sending the data i.e. it's click function
would be LinksFullAC. flush; LinksService. send() Am I right?
I've also noticed now with your code applied if I select an item in the
tilelist and click the reresh button I get the error Property categories not
found on String and there is no default value which is indicating the error
at the if statement in the code you gave me and the LinksService
[flexcoders] Re: Problems With my XML Created Array Collection
I've noticed that if I remove all items from the mysql table which populates
the remote xml file the xml that is produced is simply this:-
?xml version=1.0 ?
categories /
i.e. all of the nodes are removed so this means my app is looking for nodes
that aren't actually there so it seems I need another else if bracket to deal
with this but I haven't got a clue for how to check if an xml file is empty or
null or whatever you'd call the above in flex and what to do within this else
if bracket if it's not.
--- In flexcoders@yahoogroups.com, Robert Moss rdm0...@... wrote:
In essence yes, I do not think I would do it as part of the button click, but
instead clear it before the IF in the result handler with LinksFullAC.source
= new Array(); or LinksFullAC.removeAll(); I prefer the former.
As for your error, I'm not sure what's happening, but you should be able to
set a break in the result handler and see what is getting returned. It looks
like for the combination you describe, categories is not getting returned for
some reason. You'll need to figure out why and trap for it. The same goes
for returning 0 records. See what is getting returned and trap for it.
From: James garymoorcroft_...@...
To: flexcoders@yahoogroups.com
Sent: Mon, April 19, 2010 12:47:15 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
Hi Robert. Thanks so much for that my friend.
I have some problems with it though. You see I have an event in my app
applied to a button (refresh button) which resends data via the LinksService
i.e. LinksService. send and I've noticed that with your code if there is only
1 link i.e. 1 node and I click the refresh button it seems to keep recreating
that 1 over and over again as if it's recreating the same object in the array
collection or something. This doesn't happen if their are 2 or more
links/nodes/ objects. Perhaps I'll have to get the refresh button to empty
the array collection first before sending the data i.e. it's click function
would be LinksFullAC. flush; LinksService. send() Am I right?
I've also noticed now with your code applied if I select an item in the
tilelist and click the reresh button I get the error Property categories not
found on String and there is no default value which is indicating the error
at the if statement in the code you gave me and the LinksService itself. Any
idea what's causing this?
Another question though what if the xml contains no nodes?
You see my xml file is dynamic, I have a variable in my app called categoryid
and that variable is based on a category that the user selects in my app and
is submitted to getlinks.php which gets all the records from my mysql table
which contain that specific submitted categoryid and output them as the xml
file. Some categoryids have no records (the user can add and delte records
via my app). Is there any way of getting it to handle 0 records/nodes as well
as handling muliple records/1record which it seems to already do?
Thanks so much for your help. Sorry to be a pain :-(
--- In flexcod...@yahoogro ups.com, Robert Moss rdm0004@ wrote:
This is not exactly how I would implement, but you should get the idea. If
you have multiple category nodes, then your LinksService. lastResult.
categories. category is returned as an ArrayCollection and your code works.
If it only has one node then LinksService. lastResult. categories.
category is returned as an ObjectProxy. So in your return method you could
have the following.
if(LinksService. lastResult. categories. category is ArrayCollection) {
LinksFullAC= LinksService. lastResult. categories. category as
ArrayCollection;
}else
{
var oCat:Object = new Object();
oCat.id = LinksService. lastResult. categories. category. id;
oCat.label = LinksService. lastResult. categories. category. label;
oCat.icon = LinksService. lastResult. categories. category. icon;
LinksFullAC. addItem(oCat) ; // NOTE: LinksFullAC needs to not
only be previously declared, but must also me instantiated with new
ArrayCollection( ) for this line to work.
}
_ _ __
From: James garymoorcroft_ ict@
To: flexcod...@yahoogro ups.com
Sent: Mon, April 19, 2010 9:58:33 AM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
The thing is my xml is retrieved from a mysql database table which
sometimes will have no records or 1 record which will mean the xml will
have only 1 or no nodes which in turn causes the problem whereas sometimes
it has many records therefore the xml file would have many nodes which
would mean no problems.
I've heard of looping but can't figure out how to do it or apply it to my
code. I've tried simply changing the array collection
Re: [flexcoders] Re: Problems With my XML Created Array Collection
Thanks a lot for your time Robert. You've been brilliant. I've just managed to
find a similar solution somehwhere else but it's pretty much exactly the same
as what you've suggested. I probably should use e4x too but t's the very fact
that it needs to be implemented in a different way which puts me off. You're
right about being consisten too by using event.result as this allows for easier
modifications.
One problem that I seem to have in my code is the speed it takes to renew the
dataprovider of the tilelist. Basically in my app the user can create new links
remove links and update links which makes these changes directly to the mysql
which obviously in turn feeds the xml file which populates the array
collection/tilelist so these changes show in the app tilelist. The user can
also switch between 9 different categories of links for all of the above
actions. The thing is though each time the user clicks a category or does an
action the app sends the request to the server which makes the change to the
array collection but I've noticed that this takes a couple of seconds to
refresh the tilelist data. So for example when the user is viewing the category
1 links in the dataprovider and then clicks to category 2 it takes a few
seconds to load this data but while it's being loaded the data from category 1
is still there visible and selectable which I don't
like at all.
Originally I wanted to have 9 tilelists each with different dataproviders but
that seemed like overkill. Do you think it's best practice to have just 1
tilelist? It's just the couple of seconds that it takes for it to switch from 1
set of links to the next which I don't like.
--- On Mon, 19/4/10, Robert Moss rdm0...@yahoo.com wrote:
From: Robert Moss rdm0...@yahoo.com
Subject: Re: [flexcoders] Re: Problems With my XML Created Array Collection
To: flexcoders@yahoogroups.com
Date: Monday, 19 April, 2010, 21:00
Yes use a third if statement like: if(event.result. categories)
if(event.result. categories != null) should also work
Notice I used event.result instead of LinksService. lastResult. Small change,
but you should get in the habit as LinksService. lastResult will cause some
pain in the future if you decide to change it's name for some reason.
Amy suggested using e4x which is probably the correct answer as e4x grants you
consistency ( you do not have the arrayCollection returned sometimes and
ObjectProxy others) and allows you to work with XML in actionscript like XML
was meant to be accessed. You will still have to trap for the same issues,
just implemented in a different way. We do not always use e4x although we
probably should, being lazy will probably bite us one of these days.
From: James garymoorcroft_ i...@yahoo. co.uk
To: flexcod...@yahoogro ups.com
Sent: Mon, April 19, 2010 2:11:16 PM
Subject: [flexcoders] Re: Problems With my XML Created Array Collection
You were right about removeall (flush ha whoops) helping. I applied removeall
before the if statements like you said and the first error is now gone.
The only problem I have now is the error which occurs when there are NO nodes
in the xml i.e. all items have been removed and there are no values in my mysql
table which relate to that specific category id.
I've changed the code to this:-
private function linksResultHandler( event:ResultEven t):void
{
LinksFullAC. removeAll( );
if(LinksService. lastResult. categories. category is ArrayCollection) {
LinksFullAC= LinksService. lastResult. categories. category as ArrayCollection;
}else if (LinksService. lastResult. categories. category is ObjectProxy)
{
var oCat:Object = new Object();
oCat.linkid = LinksService. lastResult. categories. category. linkid;
oCat.categoryid = LinksService. lastResult. categories. category. categoryid;
oCat.label = LinksService. lastResult. categories. category. label;
oCat.icon = LinksService. lastResult. categories. category. icon;
oCat.link = LinksService. lastResult. categories. category. link;
LinksFullAC. addItem(oCat) ;
}
}
The thing is though in that code I have the first if statement to check for if
the result is an array collection which sets it as an array collection, the
second if statement which if it is an object proxy adds the single object to
the array collection but I think what I'll need is a third if statement which
checks if the xml is empty/null or something and assign what will happen if it
is null. Do you know of any way to do this and if so what do you think is best
to set as the operation of such an if statement to make sure this error doesn't
occur anymore? I thought it might be something like:-
if(LinksService. lastResult. categories. category is null)
but there seems to be no such thing. Any ideas?
Sorry to keep hassling but it's pretty much the last hiccup I've got in my app
and I always try to pick the brains of guys who know their stuff as much as I
can :-)
--- In flexcod...@yahoogro ups.com
