Archived:Using the externalInterface class of Flash in WRT

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Code Example

Source file: Media:externalInterfaceExample.zip

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Article

Created: Risalmin (15 Sep 2010)

Last edited: hamishwillee (14 May 2013)

This draft document will describe how to use the externalInterface class in Adobe Flash for communicating between a Web Runtime Widget (JavaScript) and a Flash SWF (ActionScript). A good example of such implementation is the On demand Web TV – have your favorite channels with you

HTML

Add an id to the Flash object's embed tag:

<object 
 id='swfObject' 
 height='100%' 
 width='100%' 
 data='myFlashApp.swf'
 allowscriptaccess='always' 
 allowFullScreen='true' 
 usefullscreen='true' 
 type='application/x-shockwave-flash' 
 loop='false' 
 name='swfObject'>
 
 <param name="canHandleException" value="true" />
 
</object>

ActionScript

ActionScript 2

//required to use the externalinterface class
import flash.external.*; 
 
//Add a function call that can be accessed from javascript
ExternalInterface.addCallback("hello",this, hello);
 
//and the actual function
function hello(){
//do something
}

ActionScript 3

//required to use the externalinterface class
import flash.external.*; 
 
//Add a function call that can be accessed from javascript
ExternalInterface.addCallback("hello", hello);
 
//and the actual function
function hello(){
//do something
}

Calling the function in Flash from JavaScript

function hello() {
	document.getElementById("swfObject").hello();
}

Example implementation

You can download an example FLA and WRT widget from this link