[flexcoders] Re: Accessing data in a Model

Mon, 05 Jun 2006 05:29:28 -0700

I also need to databind to a Horizontal List, but with
resultFormat="e4x" this no longer works. I also get this error:
TypeError: Error #1009: Cannot access a property or method of a null
object reference.

eg
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
backgroundAlpha="0"
    creationComplete="srv.send();showCategories();">

    <mx:Script>
<![CDATA[
      public function showCategories() : void
      {
      cat1.title = [EMAIL PROTECTED];
      cat2.title = [EMAIL PROTECTED];
      }
]]>
    </mx:Script>

<mx:HTTPService id="srv" url="" useProxy="false"
resultFormat="e4x" />

<mx:Model id="activityModel">{srv.lastResult.activity}</mx:Model>

<mx:Label id="Title" text="{activityModel.title}" fontSize="16" />
       <mx:VBox width="100%" height="100%">
         <mx:HDividedBox width="100%" height="75%">
                 <mx:Panel id="cat1" width="100%" height="100%" >
                   <mx:TileList height="100%" width="100%" id="tl_Category1"
        itemRenderer="Item" rowHeight="130" columnWidth="175"
allowMultipleSelection="false"
                dragEnabled="true"
                dropEnabled="true"
                        dragMoveEnabled="true" />
            </mx:Panel>
            <mx:Panel id="cat2" width="100%" height="100%" >
                <mx:TileList height="100%" width="100%" id="tl_Category2"
        itemRenderer="Item" rowHeight="130" columnWidth="175"
allowMultipleSelection="false"
                dragEnabled="true"
                dropEnabled="true"
                        dragMoveEnabled="true"/>
            </mx:Panel>
           </mx:HDividedBox>
        
      <mx:Panel title="Items to be classified:" width="100%" height="25%"
>            
            <mx:HorizontalList id="ItemsDsp" width="100%"
dataProvider="{activityModel.items.item}"
        itemRenderer="Item"  allowMultipleSelection="true"
                dragEnabled="true"
                dropEnabled="true"
            dragMoveEnabled="true" />
           </mx:Panel>
       </mx:VBox>
</mx:Application>

code for itemRenderer - Item
<?xml version="1.0" encoding="utf-8"?>

<mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml"  backgroundAlpha="0"
    borderStyle="none" width="165" height="120" verticalAlign="middle"
verticalGap="0" verticalScrollPolicy="off">

    <mx:Image id="img" height="100" width="50" source="{data.imageurl}"/>

    <mx:VBox width="100%" paddingTop="0" horizontalGap="4">
        <mx:Label text="{data.title}" fontWeight="bold"/>
    </mx:VBox>

</mx:HBox>

The xml file I am trying to read:
<?xml version="1.0" encoding="utf-8"?>
<activity title="Classification" type="Classification">
      <categories>
            <category name="Category 1" />
            <category name="Category 2" />
      </categories>
      <items>
            <item title="One" imageurl="assets/products/DoCoMo_901_ic.png" />
            <item title="Two" imageurl="assets/products/DoCoMo_F900_i.png" />
            <item title="Three" imageurl="assets/products/Casio_W21CA.png" />
            <item title="Four" imageurl="assets/products/DoCoMo_901_ic.png" />
            <item title="Five" imageurl="assets/products/Siemens_SX1.png" />
            <item title="Six" imageurl="assets/products/Casio_W21CA.png" />
            <item title="Seven" imageurl="assets/products/DoCoMo_901_ic.png" />
      </items>
</activity>










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