But if my dataProvider is an ArrayCollection of object data, not XML,
what would you suggest?
Jason Merrill
Bank of America
GT&O L&LD Solutions Design & Development
eTools & Multimedia
Bank of America Flash Platform Developer Community
________________________________
From: flexcoders@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Tracy Spratt
Sent: Tuesday, February 12, 2008 2:40 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Databinding in component
Below are some snippets.
Tracy
When working with Repeater, I advise creating a custom component
that you will repeat, and pass it the entire "currentItem", In the
component, implement a "setter" function to receive the currentItem
data.
Now, in the component, you can code normally, binding to the
data as you wish, without the hard to read currentItem references. You
also avoid the binding warnings without the cast/conversion because the
binding source is a true XML object.
And, you can dispatch events normally. In the event handler,
you can reference the component via the event.target property, and thus
get a direct reference to the dataProvider item. This is easier to
write and read than having to use getRepeaterItem().
Here are some code snippets:
In the main app or component (note how "clean" and readable this
is):
<mx:Application
<mx:VBox ...>
<mx:Repeater id="rp" dataProvider="{_xmlData}" ...>
<mycomp:MyRepeatedComponent xmlItem="{rp.currentItem}" .../>
</mx:Repeater
</mx:VBox>
And in the component, MyRepeatedComponent.mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:HBox ...
<mx:Script><![CDATA[
[Bindable]private var _xmlItem:XML;
public function set xmlData(xml:XML):void
{
_xmlItem = xml;
//do any special, non-bound ui stuff you want
}//
]]></mx:Script>
<!-- Now declare the Item UI -->
<mx:Text id="lbDescription" text="[EMAIL PROTECTED]"
width="100%" height="100%" />
Goal: Display a list of items using a complex display for each
item, and have each of those items behave like a menu element and
respond to a click anywhere on the item by running a handler function.
One solution is to use a Repeater with a custom component
In the main app or component, declare the Repeater, and the
click handler function.
<mx:Application ...
<mx:Script><![CDATA[
import MyRepeaterItem;
...
private function onRPItemClick(oEvent:Event):void
{
var xmlItem:XML = XML(oEvent.target);
}//onRPItemClick
]]></mx:Script>
<mx:VBox ...>
<mx:Repeater id="rp" dataProvider="{_xmlData}" ...>
<!-- Note we pass in the entire currentItem, and define a
click handler -->
<MyRepeaterItem xmlItem="{rp.currentItem}"
itemClick="onRPItemClick(event)" .../>
</mx:Repeater
</mx:VBox>
</mx:Application>
And in the component, MyRepeaterItem.mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:HBox mouseChildren="false" buttonMode="true"
click="onClick(event)" >
<!-- The metadata tag below allows us to define an itemClick
handler in mxml, as in the code above -->
<mx:Metadata>
[Event(name="itemClick", type="flash.events.Event")]
</mx:Metadata>
<mx:Script><![CDATA[
[Bindable]private var _xmlItem:XML;
/** Setter function */
public function set xmlItem(xml:XML):void
{
_xmlItem = xml;
//do any special, non-bound ui stuff you want
}//set xmlItem
/** Getter function */
public function get xmlItem():XML
{
return _xmlItem;
}//get xmlItem
/** Outer VBox Click handler function */
private function onClick():void
{
dispatchEvent(new Event("itemClick",false); //we do not
need/want this event to bubble
}//onClick
]]></mx:Script>
<!-- Now declare the Item UI -->
<mx:Text id="lbDescription" text="[EMAIL PROTECTED]"
width="100%" height="100%" />
</mx:HBox>
From: flexcoders@yahoogroups.com
[mailto:flexcoders@yahoogroups.com <mailto:flexcoders@yahoogroups.com> ]
On Behalf Of Merrill, Jason
Sent: Tuesday, February 12, 2008 2:24 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Databinding in component
Thanks Tracy, I'll try that route.
Jason Merrill
Bank of America
GT&O L&LD Solutions Design & Development
eTools & Multimedia
Bank of America Flash Platform Developer Community
From: flexcoders@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Tracy Spratt
Sent: Tuesday, February 12, 2008 2:18 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Databinding in component
Yes, when repeater instantiates components, it creates a array
of ids for each specific id, so each mySlider has an id mySlider[n]
where n is the index of the item.
The cleanest way to deal with this is to create a custom
component containing all the components and repeat that component. Pass
in a reference to the entire currentItem into a typed setter function.
You will find that doing this simplifies repeater work
immensely, especially when you need to dispatch an event and access the
dataProvider item in the handler. You will not need getRepeaterItem().
Tracy
From: flexcoders@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Merrill, Jason
Sent: Tuesday, February 12, 2008 12:46 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Databinding in component
In this test case below, why do I get a warning message for the
mx:Label that databinding may not be able to detect changes in the
HSlider? I'm just trying to create labels that always shows the value
of the respective slider. Since this is in a repeater, is it a conflict
with the way I assign id to the slider? What's the preferred way to do
this?
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml> " layout="absolute"
applicationComplete="init()">
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
[Bindable]
private var _dp:ArrayCollection = new ArrayCollection();
private function init():void
{
_dp.addItem(1)
_dp.addItem(2)
_dp.addItem(3)
}
]]>
</mx:Script>
<mx:Panel>
<mx:Repeater id="sliderRepeater" dataProvider="{_dp}" >
<mx:VBox>
<mx:HSlider id="mySlider"/>
<mx:Label text="{mySlider.value}"/>
</mx:VBox>
</mx:Repeater>
</mx:Panel>
</mx:Application>
Jason Merrill
Bank of America
GT&O L&LD Solutions Design & Development
eTools & Multimedia
Bank of America Flash Platform Developer Community
