[flexcoders] Re: Can I force a redraw of my dataGrid?
Derrick,
Thanks again, and once again, you have led me to another question.
I'm aware of using the bindable metatag, and also am using the
binding.utils.bindProperty method to handle some other bindings I
need manually, but I'm now wondering if i can do the following: Can
I create an Object, and as I create properties on that Object, tell
the property to be bindable, in ActionScript. I'm assuming the
metatag tells the compiler to create the necessary watchers, but it
would be really nice if that were a property I could set while I'm
dynamically creating properties of an Object...something like:
var myObj:Object = new Object();
myObj.publisher = '';
myObj.publisher.bindable=true;
Using the binding.utils.bindProperty method works great when I know
exactly the two locations between which I want to share data, but it
isn't as nice as creating a typed class within an ArrayCollection as
bindable that you can easily fit into (and broadcast changes to) a
datagrid.
A typed value object is basically an object that matches to some
data
entity you are working with. You create a class to define the
entity,
give it properites (that are bindable) and then put instances of
that
class into the ArrayCollection instead of non descript Objects
ie
class BookVO {
[Bindable]
public var title: String;
[Bindable]
public var author: String;
[Bindable]
public var ISBN: String;
public function BookVO():void {
}
}
... and then loop through the results from the webservice and for
each
item, create a new BookVO, fill in the properties and add that to
the
ArrayCollection. I imagine you are probably currently doing
something
similiar to
var book = new Object();
book.author = xmlNode.ItemAttributes.author;
book.title = xmlNode.ItemAttributes.title;
book.ISBN = xmlNode.ItemAttributes.ISBN;
This is certainly very easy to start with, but in the long run
causes
more headaches for a variety of reasons.
By using typed objects with bindable properties, it leverages the
Flex
components awareness of changes in those objects, basically the
components listen to the objects for changes, which means you don't
have to manually refresh things when changes happen.
Derrick Grigg
-
www.dgrigg.com
--- In flexcoders@yahoogroups.com, livinginswitzerland
rickgeorge@ wrote:
Thanks Derrick...
I had tried invalidateDisplay list, but not invalidateList..which
did
it. interesting. when you say typed value objects...can you
elaborate
on that? I am doing some 'non standard' things, and all of my
data is
read into an ArrayCollection via a web service, but i'm not using
XML
but text instead. Curious if what you are saying regarding typed
value
objects is something i'm bumping up against.
thanks again!
-rick
--- In flexcoders@yahoogroups.com, Derrick Grigg dgrigg@
wrote:
I think you can use the 'invalidateDisplayList()' or possibly
the 'invalidateList()' to refresh your datagrid.
Alternatively, if you use typed value objects in the
dataProvider any
changes to those, should automatically be reflected (and
viewed) in
the DataGrid if you are using databinding.
Derrick Grigg
www.dgrigg.com
--
Flexcoders Mailing List
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[flexcoders] Re: Can I force a redraw of my dataGrid?
I don't think you can add metadata like the bindable property at
runtime, it has to be declared/defined in a class. Using the binding
utils is a way to compensate for not having declared bindable
properties.
Personally I prefer to use VO's and bindable properties, overall a
much cleaner solution than generic objects and the binding utils.
Derrick Grigg
-
www.dgrigg.com
--- In flexcoders@yahoogroups.com, livinginswitzerland
[EMAIL PROTECTED] wrote:
Derrick,
Thanks again, and once again, you have led me to another
question.
I'm aware of using the bindable metatag, and also am using the
binding.utils.bindProperty method to handle some other bindings I
need manually, but I'm now wondering if i can do the following:
Can
I create an Object, and as I create properties on that Object,
tell
the property to be bindable, in ActionScript. I'm assuming the
metatag tells the compiler to create the necessary watchers, but
it
would be really nice if that were a property I could set while I'm
dynamically creating properties of an Object...something like:
var myObj:Object = new Object();
myObj.publisher = '';
myObj.publisher.bindable=true;
Using the binding.utils.bindProperty method works great when I
know
exactly the two locations between which I want to share data, but
it
isn't as nice as creating a typed class within an ArrayCollection
as
bindable that you can easily fit into (and broadcast changes to) a
datagrid.
A typed value object is basically an object that matches to some
data
entity you are working with. You create a class to define the
entity,
give it properites (that are bindable) and then put instances of
that
class into the ArrayCollection instead of non descript Objects
ie
class BookVO {
[Bindable]
public var title: String;
[Bindable]
public var author: String;
[Bindable]
public var ISBN: String;
public function BookVO():void {
}
}
... and then loop through the results from the webservice and
for
each
item, create a new BookVO, fill in the properties and add that
to
the
ArrayCollection. I imagine you are probably currently doing
something
similiar to
var book = new Object();
book.author = xmlNode.ItemAttributes.author;
book.title = xmlNode.ItemAttributes.title;
book.ISBN = xmlNode.ItemAttributes.ISBN;
This is certainly very easy to start with, but in the long run
causes
more headaches for a variety of reasons.
By using typed objects with bindable properties, it leverages
the
Flex
components awareness of changes in those objects, basically the
components listen to the objects for changes, which means you
don't
have to manually refresh things when changes happen.
Derrick Grigg
-
www.dgrigg.com
--- In flexcoders@yahoogroups.com, livinginswitzerland
rickgeorge@ wrote:
Thanks Derrick...
I had tried invalidateDisplay list, but not
invalidateList..which
did
it. interesting. when you say typed value objects...can you
elaborate
on that? I am doing some 'non standard' things, and all of my
data is
read into an ArrayCollection via a web service, but i'm not
using
XML
but text instead. Curious if what you are saying regarding
typed
value
objects is something i'm bumping up against.
thanks again!
-rick
--- In flexcoders@yahoogroups.com, Derrick Grigg dgrigg@
wrote:
I think you can use the 'invalidateDisplayList()' or
possibly
the 'invalidateList()' to refresh your datagrid.
Alternatively, if you use typed value objects in the
dataProvider any
changes to those, should automatically be reflected (and
viewed) in
the DataGrid if you are using databinding.
Derrick Grigg
www.dgrigg.com
--
Flexcoders Mailing List
FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com
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[flexcoders] Re: Can I force a redraw of my dataGrid?
A typed value object is basically an object that matches to some data
entity you are working with. You create a class to define the entity,
give it properites (that are bindable) and then put instances of that
class into the ArrayCollection instead of non descript Objects
ie
class BookVO {
[Bindable]
public var title: String;
[Bindable]
public var author: String;
[Bindable]
public var ISBN: String;
public function BookVO():void {
}
}
... and then loop through the results from the webservice and for each
item, create a new BookVO, fill in the properties and add that to the
ArrayCollection. I imagine you are probably currently doing something
similiar to
var book = new Object();
book.author = xmlNode.ItemAttributes.author;
book.title = xmlNode.ItemAttributes.title;
book.ISBN = xmlNode.ItemAttributes.ISBN;
This is certainly very easy to start with, but in the long run causes
more headaches for a variety of reasons.
By using typed objects with bindable properties, it leverages the Flex
components awareness of changes in those objects, basically the
components listen to the objects for changes, which means you don't
have to manually refresh things when changes happen.
Derrick Grigg
-
www.dgrigg.com
--- In flexcoders@yahoogroups.com, livinginswitzerland
[EMAIL PROTECTED] wrote:
Thanks Derrick...
I had tried invalidateDisplay list, but not invalidateList..which did
it. interesting. when you say typed value objects...can you elaborate
on that? I am doing some 'non standard' things, and all of my data is
read into an ArrayCollection via a web service, but i'm not using XML
but text instead. Curious if what you are saying regarding typed value
objects is something i'm bumping up against.
thanks again!
-rick
--- In flexcoders@yahoogroups.com, Derrick Grigg dgrigg@ wrote:
I think you can use the 'invalidateDisplayList()' or possibly
the 'invalidateList()' to refresh your datagrid.
Alternatively, if you use typed value objects in the dataProvider any
changes to those, should automatically be reflected (and viewed) in
the DataGrid if you are using databinding.
Derrick Grigg
www.dgrigg.com
--
Flexcoders Mailing List
FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group/flexcoders/
* Your email settings:
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* To change settings online go to:
http://groups.yahoo.com/group/flexcoders/join
(Yahoo! ID required)
* To change settings via email:
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mailto:[EMAIL PROTECTED]
* To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
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[flexcoders] Re: Can I force a redraw of my dataGrid?
I think you can use the 'invalidateDisplayList()' or possibly the 'invalidateList()' to refresh your datagrid. Alternatively, if you use typed value objects in the dataProvider any changes to those, should automatically be reflected (and viewed) in the DataGrid if you are using databinding. Derrick Grigg www.dgrigg.com -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/flexcoders/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[flexcoders] Re: Can I force a redraw of my dataGrid?
Thanks Derrick... I had tried invalidateDisplay list, but not invalidateList..which did it. interesting. when you say typed value objects...can you elaborate on that? I am doing some 'non standard' things, and all of my data is read into an ArrayCollection via a web service, but i'm not using XML but text instead. Curious if what you are saying regarding typed value objects is something i'm bumping up against. thanks again! -rick --- In flexcoders@yahoogroups.com, Derrick Grigg [EMAIL PROTECTED] wrote: I think you can use the 'invalidateDisplayList()' or possibly the 'invalidateList()' to refresh your datagrid. Alternatively, if you use typed value objects in the dataProvider any changes to those, should automatically be reflected (and viewed) in the DataGrid if you are using databinding. Derrick Grigg www.dgrigg.com -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/flexcoders/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
