How to Communicate with JavaScript?

Question Posted / dindayal dhakar

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How to Communicate with JavaScript?..

Answer / dindayal dhakar

1. In previous versions of Flash, JavaScript communication
was done via fscommand. This was a buggy and complex
technology. In fact, it was so bad that most developers
actually preferred to put their JavaScript function calls
inside the getURL function. This got the job done, but was
far from ideal.
2. Flash 8 introduces a ground-breaking new way to
integrate Flash with its host called the External
Interface. This allows Flash/JavaScript integration to be
more powerful and stable. It is also very easy to use.
External Interface offers Flash 8 Developers the following
advantages: it's easier to implement, it allows for
synchronous communication, and it supports sending a wider
selection of data types, including objects.
3. Fscommand didn't allow for synchronous communication.

4. The External Interface allows you to call a JavaScript
function and receive a return value.
5. Fscommand allowed you to send primitive data types as
arguments in the function calls. Now, with External
Interface, you can send complex objects as arguments. In
example 2 below, we are passing the entire
system.capabilities object back to JavaScript.

<script language="JavaScript">
function getLocation() {
return window.location.toString();
}
</script>

import flash.external.ExternalInterface;
function displayPageLocation():Void {
locationDisplay.text = ExternalInterface.call
("getLocation");
}
locationButton.addEventListener("click",
mx.utils.Delegate.create(this,
displayPageLocation));

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