Skip to main content

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...
    <mx:TextInput id="txtMyText?/>
    <mx:Label id="lblMyLabel? text="{txtMyText.text}"/>

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
    <mx:TextInput id="txtMyText? />
    <mx:Label id="lblMyLabel? />

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

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

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:

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:

<li><a href=""></a>
<li><a href=""></a>
<li><a href=""></a>
<li><a href=""></a>

Popular posts from this blog

Installing python 3.4.x on OSX El Capitan

I love "brew" package manager, but sometimes being too progressive breaks things.  I have several python apps that I maintain that get deployed to AWS using Elastic Beanstalk.  AWS eb can deploy with python 2.7 or 3.4.  Any recent 'brew install python3" will get 3.5.1. #annoying

Making Macbook Air with 128GB SSD usable with Bootcamp

I recently got a new Macbook Air 11" (the 2012 version) and loaded it with goodies like 8GB ram and 2GHz Core i7.  What I DIDN'T upgrade was the internal SSD.  My config came with 128GB SSD and I refused to pay $300+ to upgrade it to 256GB.  Yeah I know, some call me cheap, but SSds cost $75-$150 for 240GB, so adding another 128GB for $300 seemed way too steep for me.  I figured "ok, I'm going to make 128G work!"

Here is the story of how that went...

Election day plus 1: Social Media Nightmare

It is election day plus 1, and a very emotional day with no way to win for many.

Social media was a force to be reckoned with this election year.  No matter what position you take, the world is ready to pounce on you and tell you why YOU are evil, intolerant or a deplorable -- and the reason for all their woes.  This isn't a new problem, though...  All of the liberal vs conservative issues are causing rifts between otherwise civil people, and it seems to be the worst on Facebook and twitter.

If I say I am for Hillary:
i am part of the "corrupt system."

If I say I am against Hillary:
I am stupid and uneducated

If I say I am for Trump:
I am against women,
I am religiously intolerant,
I am a bigot

If I say I am against Trump:
I am against the 2nd amendment,
I don't have any idea how government works,
I am part of the problem with American society,
I am against the police

Stay with me now, this isn't meant to make people angry, but it is mean to shine some light on a social …