Mega Code Archive
Add event handler to ChangeWatcher
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Code from Flex 4 Documentation "Using Adobe Flex 4".
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<!-- binding/DetectWatcher.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"
initialize="initWatcher();">
<s:layout>
<s:VerticalLayout />
</s:layout>
<fx:Script>
import mx.binding.utils.*;
import mx.events.FlexEvent;
import mx.events.PropertyChangeEvent;
public var myWatcher:ChangeWatcher;
// Define binding watcher.
public function initWatcher():void {
// Define a watcher for the text binding.
ChangeWatcher.watch(textarea, "text", watcherListener);
}
// Event listener when binding occurs.
public function watcherListener(event:Event):void {
myTA1.text="binding occurred";
// Use myWatcher.unwatch() to remove the watcher.
}
</fx:Script>
<!-- Define a binding expression to watch. -->
<s:TextInput id="textinput" text="Hello" />
<s:TextArea id="textarea" text="{textinput.text}" />
<!-- Trigger a binding. -->
<s:Button label="Submit" click="textinput.text='Goodbye';" />
<s:TextArea id="myTA1" />
</s:Application>
]]>