How to detect dataprovider change in spark List ?

The problem is : when the dataprovider changes, the List unselects its items. I want the selected item of the List to stay selected, even if the dataprovider has a new item, for example.
So I try to detect a change in the dataprovider, to be able to re-select the item that was selected before the change.
I tried to listen several events but it didn't work :
- change is dispatched by user, not by code.
- updatecompleted is dispatched when the dataprovider changes but it is triggered also when the list is resized, and I don't want that.
- collectionChange is not dispatched
I don't understand why valueCommit is not dispatched when the dataprovider changes.
Can you help me ???

There is a dataProviderChange event fired whenever dataProvider is set,
but it may not be listed in the metadata so you may not be able to access
from MXML.
Flex harUI,
Why isn't this event exposed publicly through the metadata of the class?
The easy fix I can come up with is to extend the List, by simply exposing the event, like:
[Event(name="dataProviderChange", type="flash.events.Event")]
public class ExtendedList extends List
But I don't know if it's good practice...

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How to detect value change of item?

Hi all,
We want to list all goods that customer chooses, so TileList is used to display all goods information and a custom component MyItem is used as ItemRenderer. Meanwhile a Label is used to display the sum of all the goods. The hierarchy is simply like this:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" >
<mx:TileList id="tl" dataProvider="{acGoods}" ItemRenderer="MyItem"/>
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Here, acGoods is an ArrayCollection which I believe is bindable.
User may change price inside MyItem directly, so the text of the Label need to update as well. I find that acGoods contains latest price. Now the problem is Label text stays the same. I have tried to call calculating function in set acGoods() but it doesn't work.
Please don't sugguest dispatch event because this is only a simplified scenario. If anybody tell me how to implement this by binding mechaism, that'll be very helpful.
Best wishes,

protected function get totalLabelText():string {
// for each var i:* in acGoods and so on
return 'Calculated label here';
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Inside MyItem:
once you changed something invoke:
Application.application.executeBindings(true);
Hope this will work for you

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If you are scrolling, will you change which ones have the different
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Hi all,
I Know how to create a JColorChooser dialog (JColorChooser.createDialog()) to which I can add actionlistener to detect a new color has been selected.
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Ok, a I found a way:
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Hello everyone,
I have a question related to the size of a JFrame or JPanel. I add a few JPanels to a JFrame and I wanted to detect when the size of the JFrame window or the JPanel itself had changed (if the user pressed the "Maximize icon" or simply dragged the window size from the one of the corner of the window). I am not sure if I need a listener added to the Frame, and what kind of listener that would be (if any exists, I am not sure).
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I am having one more issue.
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Franky
Solved!
Go to Solution.

I'm talking to myself, but FYI:
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Hello,
how could I animate a Horizontal Spark List and enable the Mouse-Wheel for it ?
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How to animate this now ?
http://wensauer.info/flex/AnimatedHorizontalSparkList/ (view source enabled)
As you can see when you reach the last item and keep scrolling there is some pixels overhead so that you can scroll the content freely.
How to fix this ?
Colclusion:
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Marc

Ok,
I solved some questions myself.
It is working so far to a certain extend.
When I scroll to fast with the mouse wheel the auxilary slider gets out of sync with the List.
Is there a way to only start a new animation once the current is finished ? can I lock it somehow or put them into a queue?
http://www.wensauer.info/flex/AnimatedHorizontalSparkListII/
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Idea ? Noone ?

How Do You Populate A Spark List Control With An Array?

Hello, all,
Sorry to come accross so frustrated, but how in the name of God do you populate a Spark list control with the data in an array? You used to be able to do this with the mx:List control, but the guys developing Flex just had to make things more difficult than they need to be! I am more of a code purist and prefer doing things the way they have been done for decades, but apparently nothing can ever stay simple!
I simply want to populate a list control with an array and this shouldn't be rocket science! I found out that I must use a "collection" element, so I decided that an arrayCollection would be best. However, after searching Adobe's documentation about arrayCollections, I am lost in a black hole of data binding, extra lines of code just to add a new element, the need to sort it, etc...!
Here is my code:
var pendingArray:ArrayCollection = new ArrayCollection();
for ( var i:int = 0 ; i < queue.length ; i++ )
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Here is the relevant MXML:
<s:VGroup>
     <s:List id="knockingList" width="110" height="100"/>
</s:VGroup>
I'm not getting any errors, but the list is not populating.
I have seen several examples where the arrayCollection is declared and populated in MXML:
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                <fx:Object label="MO" data="Jefferson City"/>
                <fx:Object label="MA" data="Boston"/>
                etc...
           </fx:Array>
        </mx:ArrayCollection>
That may be fine for an example, but I think this is a rare situation. Most of the time I would image that the arrayCollection would be created and populated on the fly in ActionScript! How can I do this?
Thanks in advance for any help or advice anyone can give!
Matt

In your post it seemed like you were trying to take care of many considerations at once: optimization, design, architecture. I would suggest you get something up and running and then worry about everything else.
If I use data binding, then I will probably have to declare the arrayCollection as a global variable and then I'll have to write 100 or so extra lines of code to addItem(), removeItem(), sort(), etc... It just seems like too much overhead.
I believe you may have some misconceptions about databinding in general. You won't have to make it a global variable and you certainly won't need an extra 100 lines of code. If you did this forum would be a very , very quiet place.
I don't want to use data binding because the original array is refreshed often and there is one function called by an event that re-declares the arrayCollection each time, populates it with the array, and then sets it as the list's dataprovider.
That is the beauty of the ArrayCollection, it can handle the updates to its source Array. I don't know if you need to redeclare the ArrayCollection, resetting the source to the new Array allows everyone involved to keep their references so you don't have to worry about any "spooky" stuff going on.

How to handle multiple selection in the Spark List control with checkbox as itemrenderer?

Hi All,
I am using checkbox as an ItemRenderer in spark list.
I have a query.
how to handle multiple selection in the Spark List control with checkbox as itemrenderer?
how to retrieve the selected item label?
Thank you in advance.

Hi there, I'll tweak your code a little bit to something like this:
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                layout="vertical">
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        <![CDATA[
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             import mx.controls.CheckBox;
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        ]]>
    </mx:Script>
<mx:ArrayCollection id="collection">
        <mx:Object label="Test A"/>
        <mx:Object label="Test B"/>
        <mx:Object label="Test C"/>
        <mx:Object label="Test D"/>
        <mx:Object label="Test E"/>
        <mx:Object label="Test F"/>
        <mx:Object label="Test G"/>
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<mx:List id="chkList" dataProvider="{collection}" itemRenderer="mx.controls.CheckBox" itemClick="onChange(event);" allowMultipleSelection="true"/>
</mx:Application>

How do i set spark list selected item's color??

hey guys... so got a little problem... i have a spark list which gets populated from a array collection that looks likda like this
[0] = "name1"
[1] = "name 2"
[2] = "name 3"
when i click on say "name 1" i need the color of "name 1" to change to say red...
and when i click on another item i need that color to stay... red on "name 1"...
oh and... i need to do the color change in actionscript rather than the mxml file...
any ideas???

Hi,
I'm not sure if this is exactly what you are looking for. What I did was created an itemRender for the list and assigned it like so
<s:List dataProvider="{ listDataProvider}" itemRenderer="listItemRenderer"/>
And the listItemRenderer will look some
//Code Begins
<?xml version="1.0" encoding="utf-8"?>
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
                          xmlns:s="library://ns.adobe.com/flex/spark"
                          xmlns:mx="library://ns.adobe.com/flex/mx"
                          focusEnabled="true" >
    <fx:Script>
        <![CDATA[
            var clicked:Boolean=true;
            protected function clickHandler(event:MouseEvent):void
                    clicked?labelRender.setStyle("color","0x00FF00"):labelRender.setStyle("color","0xFF0000") ;
                    clicked=!clicked;
        ]]>
    </fx:Script>
    <s:Label id="labelRender" text="{data}" color="0xFF0000" click="clickHandler(event)"/>
</s:ItemRenderer>
//Code Ends
In the above example the colour toggles on each click. So, you can apply anything. assume you have a property called color in your array collection, you can access it as data.color and then set the text to that color when it is clicked. I hope this helps. Do write back if you have any issues.
Nishad

How to search XML data from a HTTPMultiService and display the result on the Spark List

Hello all,
I am totally new to Flash Builder and Actionscript and hope someone might be able to help me out. I basically create a mobile app with a single view. The view has a TextInput as a search box and a search button. I conntected a Data/Service using a local XML file and bind the Data to a Spark List. Innitally the List will show nothing until the user enter the search term and hit the button. The List suppose to show the XML data that match the search term.
Now is my problem. I cannot make the List to show the data that match the search text. The List just shows ALL the data.
Here are my MXML code:
<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
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        title="Search">
    <fx:Script>
        <![CDATA[
            import mx.events.FlexEvent;
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                navigator.popView();
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                getDataResult.token = shopping.getData();
            protected function seach_clickHandler(event:MouseEvent):void
                getDataResult.token = shopping.getSearchData(searchTxt.text);
        ]]>
    </fx:Script>
    <fx:Declarations>
        <s:CallResponder id="getDataResult"/>
        <shopping:Shopping id="shopping"/>
        
    </fx:Declarations>
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        <s:Button height="79" label="Back" click="button1_clickHandler(event)"/>
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    <s:List id="list" left="0" right="0" top="111" bottom="0"
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Here is the _Super_Shopping.as file:
* This is a generated class and is not intended for modification. To customize behavior
* of this service wrapper you may modify the generated sub-class of this class - Shopping.as.
package services.shopping
import com.adobe.fiber.core.model_internal;
import com.adobe.fiber.services.wrapper.HTTPServiceWrapper;
import com.adobe.serializers.xml.XMLSerializationFilter;
import mx.rpc.AbstractOperation;
import mx.rpc.AsyncToken;
import mx.rpc.http.HTTPMultiService;
import mx.rpc.http.Operation;
import valueObjects.Shop;
[ExcludeClass]
internal class _Super_Shopping extends com.adobe.fiber.services.wrapper.HTTPServiceWrapper
    private static var serializer0:XMLSerializationFilter = new XMLSerializationFilter();
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        _serviceControl = new mx.rpc.http.HTTPMultiService();
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         var argsArray:Array;
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         operation.serializationFilter = serializer0;
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         operation = new mx.rpc.http.Operation(null, "getSearchData");
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         operation.method = "GET";
         operation.resultFormat = "text";
         argsArray = new Array("item");
         operation.argumentNames = argsArray;
         operation.properties = new Object();
         operation.properties["xPath"] = "/::shop";
         operation.resultElementType = valueObjects.Shop;
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      * @see mx.rpc.AsyncToken
      * @see mx.rpc.CallResponder
      * @return an mx.rpc.AsyncToken whose result property will be populated with the result of the operation when the server response is received.
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        var _internal_operation:mx.rpc.AbstractOperation = _serviceControl.getOperation("getData");
        var _internal_token:mx.rpc.AsyncToken = _internal_operation.send() ;
        return _internal_token;
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        var _internal_operation:mx.rpc.AbstractOperation = _serviceControl.getOperation("getSearchData");
        var _internal_token:mx.rpc.AsyncToken = _internal_operation.send(item);
        return _internal_token;
The getSearchData() supposed to return XML data that match the search text, but it doesn't. Can anyoen help?
Thank you!

Hi,
are you able to change dynamically the operation.url = "assets/data/shopping.xml";?
i need to do that based on the users input.
Thanks in advance,

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Hi SpWrk
If you have already created some sites. You would need to apply these changes either Programetically (Powershell or C#) or Manually.
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Regards
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Hi Jack!
"Will have to decide to change my account..."
Here is some additional info.
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Log out of Discussions. Delete the Apple Cookies in your browser preferences. Then follow either of these instructions.
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If you haven't signed up for an Apple ID for the Apple Store or AppleCare Support website (or forgot your old one), you can create a new account on the My Info webpage. Just click the "create one" link on the right side of the My Info page. Choose your country location and preferred language from the appropriate pop-up menus, then click Create Account. In the resulting page, enter a unique name (such as your email address) in the Apple ID field and fill in your other relevant information accordingly (fields marked with * are required). Click Continue to complete the process.
-To register, click Login in the sidebar on the right side of the Discussions page. In the resulting page, click the "create one" link at the bottom of the page, then click "create one" in the subsequent page and follow the instructions to create an Apple ID. For more information, see the Apple ID FAQ page.
ali b

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Hi, I have a spark list with multiple selection allowed. I want to add a button next to the list with which to deselect all selected items. How do I go about that? I tried to set myList.selectedItems = null, and myList.selectedItems = new Vector.<Object>, but to no avail. Help would be very much appreciated!

Hi Sam,
According to your description, my understanding is that you want to update multiple items in another list when updated a list item.
In the event receiver, you can update the multiple item using Client Object Model.
Here is a code snippet for your reference:
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ClientContext clientContext = new ClientContext(siteUrl);
List oList = clientContext.Web.Lists.GetByTitle("another list name");
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Best regards,<o:p></o:p>
Zhengyu Guo
Zhengyu Guo
TechNet Community Support

How to detect dataprovider change in spark List ?

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