Hi Nayan,
I am not sure you got your answer or not, but here is the thing:
You have an ArrayCollection on the left hand side on on the right hand side you
are trying to return an Array, so binding is improper and it will not work
until n unless you use a loop.
For an example:
private var myArray : Array;
var smallCollection:ArrayColletion = new ArrayCollection();
if(bigCollection.toArray.slice(0,10).length > 0) {
this.myArray = bigCollection.toArray.slice(0,10);
do{
smallCollection.addItem(myArray.pop());
}while(myArray.length > 0);
}
This way, you can parse your array and bind the values to ArrayCollection.
But if you want to directly bind them then the point 3, you mentioned was the
correct one.
I hope it may help you.
Thanks & Regards,
Savan
----- Original Message ----
From: Nayan Savla <[EMAIL PROTECTED]>
To: [email protected]
Sent: Wednesday, 5 March, 2008 6:15:31 AM
Subject: Re: [flexcoders] extracting items from array collection getItemAt
doesn't work
cool, found out what i was doing wrong,
testList.property. (@name == "account_status" )[EMAIL PROTECTED] //not the
correct node
had to use,
testList.(@name == "account_status" )[EMAIL PROTECTED]
in this case there is name, value attributes for every node, will keep
the other way in mind as well.
thanks once again.
Nayan
On Tue, Mar 4, 2008 at 4:33 PM, Tracy Spratt <[EMAIL PROTECTED] com> wrote:
>
>
>
>
>
>
>
>
>
> NO FOR LOOPS with e4x! Well, hardly ever anyway. You access serach on
> attributes like this:
>
>
>
> var xlFound:XMLList = myXML.property. (@name==" username" ); //*all e4x
> expressions return an xmllist*
>
> var xmlFound:XML = xlFound[0]; //if we know there wil be only one node
> found, get it
>
> trace(xmlFound. @value); //will show 'me'
>
>
>
> Note, if you are filtering on an attribute value, and not all nodes have
> that attribute, you will get an error with the above syntax. To avoid that
> I always use this form:
>
> var xlFound:XMLList = myXML.property. (attribute( "name")== "username" );
> //*all
> e4x expressions return an xmllist*
>
>
>
> That format also lends itself to dynamic expressions, since "name" or
> whatever can be a variable containing the attribute name.
>
>
>
> Tracy
>
>
>
> ____________ _________ _________ __
>
>
> From: [EMAIL PROTECTED] ups.com [mailto:[EMAIL PROTECTED] ups.com] On
> Behalf Of Nayan Savla
> Sent: Tuesday, March 04, 2008 2:36 PM
>
>
> To: [EMAIL PROTECTED] ups.com
> Subject: Re: [flexcoders] extracting items from array collection getItemAt
> doesn't work
>
>
>
>
>
>
>
>
> Tracy,
>
> I see your point in using e4x expressions and the performance hit i
> take just to use dynamic nested structure. It won't take much for me
> to convert my code to make use of e4x functionality.
>
> I have started doing that and i couldn't find a way to search and
> match attributes, for eg.
>
> <property name="username" value="me"/>
> <property name="account_ status" value="active" />
> <property name="session_ id" value="h5142ner7vq5 oitqcvi0" />
> <property name="salt" value="e9d6b1409252 4122254"/ >
> <property name="signup_ date" value="2007- 08-16"/>
> <property name="now" value="2008- 03-04"/>
> <property name="first_ name" value="Nayan" />
>
> how do i retrieve the value attribute associated with the attribute
> name="username" ?
>
> I know i could always run a for loop and then store the data as
> name-value pairs in an object but i want to know if there is a way
> doing it using the xmllist class.
>
> testList.property. (@name == "account_status" )[EMAIL PROTECTED]
>
> something like this, it will be really helpful since something like
> this would be the beginning.
>
> thanks for all your help.
> Nayan
>
> On Mon, Mar 3, 2008 at 7:12 PM, Tracy Spratt <[EMAIL PROTECTED] com> wrote:
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > As I suspected, you are not using xml:
> >
> > "I haven't set the resultformat of my httpservice, its
> > using the default format."
> >
> >
> >
> > The default resultFormat is to have Flex convert your XML into a nested
> > dynamic object structure. This converts XMLLists into arrays, among other
> > things.
> >
> >
> >
> > Generally this is bad. There is no benefit to a nested dynamic structure
> > over XML and in fact, there are many reasons to use XML, e4x expressions
> > being chief among those reasons. Your current situation is actually the
> > worst of both worlds: you lose the e4x functionality and suffer from the
> > performance hits of non-strongly- typed data access.
> >
> >
> >
> > The only reason to stay on this course is laziness.
> >
> >
> >
> > If you absolutely insist, I will tell you how to get a ArrayCollection
> out
> > of the mess you have, but it would be a mistake. Two better options are:
> >
> > * Use XMLListCollection
> >
> > * Use e4x and convert your XMLList into an ArrayCollection of strongly
> typed
> > data objects. This is a manual process of looping over the XMLList and
> > building each object and then adding it to the ArrayCollection
> >
> >
> >
> >
> >
> > Tracy
> >
> >
> >
> > ____________ _________ _________ __
> >
> >
> > From: [EMAIL PROTECTED] ups.com [mailto:[EMAIL PROTECTED] ups.com] On
> > Behalf Of Nayan Savla
> > Sent: Monday, March 03, 2008 7:11 PM
> > To: [EMAIL PROTECTED] ups.com
> > Subject: Re: [flexcoders] extracting items from array collection
> getItemAt
> > doesn't work
> >
> >
> >
> >
> >
> >
> > the url parameter for the httpService is a XML file so yes,
> >
> > var bigCollection: ArrayCollection = data.result. myBigList as
> > ArrayCollection; //I am reading an xml file.
> >
> > this is true. I haven't set the resultformat of my httpservice, its
> > using the default format.
> >
> > Also in the debugger i see that the variable bigCollection stores the
> > xml file as a object list and as i mentioned i can easily extract the
> > array from this using,
> >
> > var smallCollection: Array = bigCollection. toArray() .slice(0, 10);
> > //this works just fine.
> >
> > the data in this array is as expected, What i don't understand is why
> > i can't convert it into an ArrayCollection.
> >
> > Nayan
> >
> > On Mon, Mar 3, 2008 at 3:39 PM, Tracy Spratt <[EMAIL PROTECTED] com>
> wrote:
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Have you verified this line below? It raises doubts:
> > >
> > >
> > > var bigCollection: ArrayCollection = data.result. myBigList as
> > > ArrayCollection; //I am reading an xml file.
> > >
> > >
> > >
> > > First, XML will only yield an XMLList and you cannot cast an XMLList to
> > an
> > > ArrayCollection.
> > >
> > >
> > >
> > > I suspect you may not have xml as you think, but instead a nested
> object
> > > structure. It depends on how you are getting your data. If that is so,
> it
> > > is not a good way to do it. Have you set your resultFormat= "e4x"?
> > >
> > >
> > >
> > > If you are getting XML from the server, why not use XMLListCollection?
> > >
> > >
> > >
> > > If you do not want to use that, you should convert your XMLList into an
> > > ArrayCollection of strongly typed data objects. This is a manual
> process
> > of
> > > looping over the XMLList and building each object and then adding it to
> > the
> > > AC.
> > >
> > >
> > >
> > > Tracy
> > >
> > >
> > >
> > > ____________ _________ _________ __
> > >
> > >
> > > From: [EMAIL PROTECTED] ups.com [mailto:[EMAIL PROTECTED] ups.com] On
> > > Behalf Of Nayan Savla
> > > Sent: Monday, March 03, 2008 4:00 PM
> > > To: [EMAIL PROTECTED] ups.com
> > > Subject: [flexcoders] extracting items from array collection getItemAt
> > > doesn't work
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi All,
> > >
> > > I am trying to get data from an ArrayCollection and i tried various
> > > things without any luck.
> > >
> > > this is the code,
> > >
> > > var bigCollection: ArrayCollection = data.result. myBigList as
> > > ArrayCollection; //I am reading an xml file.
> > >
> > > 1) var smallCollection: ArrayCollection =
> > > bigCollection. getItemAt( 0,10); //i believe this is the correct method
> > > but doesn't work
> > >
> > > 2) var smallCollection: ArrayCollection =
> > > bigCollection.. toArray() .slice(0, 10) as ArrayCollection; //this returns
> > > null
> > >
> > > 3) var smallCollection: Array = bigCollection. toArray() .slice(0, 10);
> > > //this works just fine.
> > >
> > > any ideas why i can't just use the second statement, please ignore my
> > > knowledge of flex if i am missing something fundamental.
> > >
> > > thanks
> > > Nayan
> > >
> > >
> >
> >
>
>
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