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Manually adding bindings between objects in Flex/AS3

I recently needed to manually create bindings in AS3 code between objects, and since MXML ultimately all is just AS3, I figured there had to be a way to do it.

<b>Binding in MXML</b>

Lets look at the following code...
<code>
    <mx:TextInput id="txtMyText?/>
    <mx:Label id="lblMyLabel? text="{txtMyText.text}"/>
</code>

Here you bind the text property of the TextInput to the label's text property so wh you type in the textInput, it reflects in the label.

<b>Binding in AS</b>

The key to this is a class called BindingUtils in the mx.binding.utils package. You can use this class as below:<more/>You have your components say in mxml as follows
<code>
    <mx:TextInput id="txtMyText? />
    <mx:Label id="lblMyLabel? />
</code>

Now you import the Binding utils and change watcher classes:
<code>
    import mx.binding.utils.BindingUtils;
    import mx.binding.utils.ChangeWatcher;
</code>

Then you use the bindProperty method to create the binding:
<code>
    private var watcher:ChangeWatcher;  
    watcher = BindingUtils.bindProperty(txtMyText,"text", lblMyLabel,"text");
</code>

This binds the txtMyText.text to lblMyLabel.text.

<b>Unbinding in AS</b>

Since we assigned the binding to a ChangeWatcher, we can then just stop watching it:
<code>
    watcher.unwatch();
</code>

I found this info very helpful and it makes coding with our Codex framework much more "flexible" (no pun intended).

Here are some good related links where I got some of this reference info:

<ul>
<li><a href="http://raghuonflex.wordpress.com/2007/08/30/binding-in-mxml-as/">http://raghuonflex.wordpress.com/2007/08/30/binding-in-mxml-as/</a>
<li><a href="http://raghuonflex.wordpress.com/2007/09/17/binding-and-unbinding-variables-in-as3/">http://raghuonflex.wordpress.com/2007/09/17/binding-and-unbinding-variables-in-as3/</a>
<li><a href="http://www.duzengqiang.com/blog/article.asp?id=460">http://www.duzengqiang.com/blog/article.asp?id=460</a>
<li><a href="http://weblogs.macromedia.com/auhlmann/archives/2006/09/using_binding_s.html">http://weblogs.macromedia.com/auhlmann/archives/2006/09/using_binding_s.html</a>
</ul>

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