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Figure 9-5. The JavaScript callback with the alert Excellent. Your Flex applications can now talk to the JavaScript layer. But what if you want the JavaScript layer to be able to specify the name of the function to call Well, in that case, I can specify a parameter to the SWF for the application. That Flex code is shown here:

/** * Receive the signal that the remote player is done * moving (no more jumps possible). */ public synchronized void endRemoteTurn(String taunt) { myState = LOCAL_TURN; myGame.endOpponentTurn(); myCanvas.setWaitScreen(false); myCanvas.repaint(); myCanvas.serviceRepaints(); if(taunt != null) { myCheckers.displayTauntMessage(taunt); } } } Note that none of the code up to this point has been specific to the game of checkers. By modularizing the code, you make it reusable. In the next chapter you ll see how to replace the SMS communications code with Bluetooth communications code, adapting the same game code to a different protocol. By the same token, all of the code so far could easily be adapted (with very little modification) to any SMS-based two-player game where the players take turns.

<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" minWidth="1024" minHeight="768" creationComplete="creationCompleteHandler()"> <fx:Script> <![CDATA[ private var callbackName:String=""; protected function creationCompleteHandler():void { callbackName = ( parameters["callback"] != null ) parameters["callback"] : "itemSelected"; } private function onDoubleClick(event:Event):void { ExternalInterface.call(callbackName, list.selectedItem); } ]]> </fx:Script> <s:List id="list" width="300" doubleClick="onDoubleClick(event);" doubleClickEnabled="true"> <s:dataProvider> <s:ArrayCollection> <fx:String>Apples</fx:String> <fx:String>Oranges</fx:String> <fx:String>Bananas</fx:String> </s:ArrayCollection> </s:dataProvider> </s:List> </s:Application>

Now if you pass a different value for callback, the new value will be used as the name of the JavaScript function to get the callback message. You also need to change the index.template.html pageto create the Flash with the parameter. This change is shown in Figure 9-6. flashvars.callback = myCallback;

In the example source code, the href property is http://www.apress.com, but the comparison is the value http://www.apress.com/. Between the two buffers, there is a missing slash character. When the web browser processes the link element written as HTML, a slash is added to the href property. The added slash is not obvious to the script author and leads to a by-accident error, where by debugging you find out that a slash has been added. Using the id property, there is no translation by the web browser causing a by-accident error. Following is the rewritten HTML that uses id properties to identify each link: <div onclick="return MonitorLinks( event)"> <a href="http://www.apress.com" id="apress" target="external">Apress is not allowed</a> <a href="http://www.google.com" id="google" target="external">Google is not allowed</a> <a href="http://www.slashdot.org" id="slashdot" target="external">Slashdot is allowed</a> </div> Following is the MonitorLinks function rewritten to use the id property: function MonitorLinks( evt) { evt = (evt) evt : ((event) event : null); if( evt) { var elem = (evt.target) evt.target : ((evt.srcElement) evt.srcElement : null); EBVN if( elem) { if( elem.id == "apress") { window.alert( "Not allowed on Apress"); return false; } else if( elem.id == "google") { window.alert( "Not allowed on Google"); return false; } else if( elem.id == "slashdot") { return true; } } } return false; } The HTML and the function implementation stay relatively the same, with the only real change being the addition and comparison of the id property.

Now let s have a look at the code that makes this game Checkers. Listing 6-8 shows the CheckersCanvas class. Listing 6-8. CheckersCanvas.java package net.frog_parrot.checkers; import javax.microedition.lcdui.*; /** * This class is the display of the game. * * @author Carol Hamer */ public class CheckersCanvas extends Canvas { //--------------------------------------------------------// static fields /** * color constant */ public static final int BLACK = 0;

Figure 9-6. The update required to index.template.html Also, you need to change the JavaScript function to match the one you specified to the SWF application.

After making all these changes, you can run the example again in Flash Builder 4, and it should look and work exactly the same. Having shown this connection two questions arise: how many arguments can you send over and how complex can they be The answer to the first question is as many as you like. As for the second, primitive values (strings, numbers, etc.) all work, as do arrays. Variables of type Object can go across as JavaScript associative arrays. To demonstrate this, we will show one further refinement on the original example. This new code is as follows:

There are other ways to wire events. One popular other way is to retrieve the HTML element and then associate a function to that element. So, for example, if you were capturing the click event, you would assign the onclick property to a function. Then when a click occurs, an event