Solved

Flex 2.1 ChangeWatcher working only once

Posted on 2011-03-22
1
482 Views
Last Modified: 2012-05-11
I have been working with flex 2.1 for a while now and have recently used the ChangeWatcher for finding out when the value of the variable changes.

The handler is getting invoked once when the value is getting changed. But for subsequent changes, I believe the handler is not being called.

My code is something as follows:

Could someone please advice as to what could be going wrong?

File:Caller.mxml(it is a popup screen)

//in mx:Script

private var watch:ChangeWatcher = ChangeWatcher.watch(a,"numberOfItems",updateScreen);

private function updateScreen(event:Event):void{
Alert.show(a.numberOfItems);

Open in new window

File: A.as

[Bindable] public var numberOfItems:int;

Open in new window

0
Comment
Question by:Chikithegreat
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 29

Accepted Solution

by:
dgofman earned 50 total points
ID: 35192924
Workd for me, only exception when you may not get fire event is assigning value is the same as exisitng numberOfItems, in this cse you should create a setter and dispatchEvent manually or temporary assign to -1 or some other number

Main.mxml

<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" width="100%" height="100%" initialize="init()" xmlns:projectWork="*">
	<s:layout>
		<s:VerticalLayout/>
	</s:layout>
	<fx:Script>
		<![CDATA[
			import mx.binding.utils.ChangeWatcher;
			import mx.controls.Alert;
			

			private var a:A = new A();
			private var watch:ChangeWatcher = ChangeWatcher.watch(a,"numberOfItems", updateScreen);
			
			private function updateScreen(event:Event):void{
				Alert.show(String(a.numberOfItems)); 
			}
		]]>
	</fx:Script>
	<s:Button label="Increment" click="a.numberOfItems++"/>
</s:Application> 

Open in new window



A.as

package
{
	public class A
	{
		[Bindable]
		public var numberOfItems:int = 0; 
	}
}

Open in new window

0

Featured Post

Secure Your WordPress Site: 5 Essential Approaches

WordPress is the web's most popular CMS, but its dominance also makes it a target for attackers. Our eBook will show you how to:

Prevent costly exploits of core and plugin vulnerabilities
Repel automated attacks
Lock down your dashboard, secure your code, and protect your users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

First things first - Preparation We need all the part for this install and it's much nicer to have them all on hand when you need them so here's what's required. Download Eclipse 3.5 32 bit (I like the Classic flavour) from here. (http://www.e…
Microsoft is moving in-place eDiscovery & hold from ECP to EOP console under Content Search in Search and Investigation Options.  In this post, I will be showing you how to export emails to a PST file using the Content Search Options.
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

728 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question