Instantiation of class through mxml - definition of the properties
Hello
I am trying to create a reusable component with an actionscript class.
I would like to be able to put a handful of attributes of the class properties withmxml. So far I have had no success doing so.
I have my problem subset in a separate simplified project, in an attempt to exclude any of the other parts of the actual application interfere with what I seek to accomplish. Unfortunately, my simplified project gives the same result.
In my example, I'm just trying to set the value of the property "myValue" Can someone tell me what I am doing wrong? What Miss me?
Thanks in advance for any help!
Main application (TestProj.mxml)
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:pkg="pkg.*"> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <pkg:TestClass myvalue="some value" /> </s:Application>
ActionScript (pkg\TestClass.as) class
package pkg { import mx.controls.Alert; import mx.core.UIComponent; public class TestClass extends UIComponent { private var _myvalue:String; public function TestClass() { Alert.show("myvalue=" + this._myvalue); } public function get myvalue():String { return _myvalue; } public function set myvalue(value:String):void { _myvalue = value; } } }
Hello
The property is set correctly, but your class constructor always executes before the attributes - it is because Flex needs to create the instance and run the c - tor before it can set values on the instance. Instead, try something like this:
This will run the Alert.show when the component is initialized. If you need to put an init code in the component itself and that the code is based on the values defined in MXML, then you can override the UIComponent public function initialize (): void.
-Evtim
Tags: Flex
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