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<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>
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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;
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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.
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<script> function myCallback(item) { alert( item ); } </script>
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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:
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< xml version="1.0" encoding="utf-8" > <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"> <fx:Script> <![CDATA[ import mx.collections.ArrayCollection; [Bindable] private var items:ArrayCollection = new ArrayCollection(["Apples", "Oranges", "Bananas"]); private function onDoubleClick(event:Event):void
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{ ExternalInterface.call("itemSelected", list.selectedIndex, items.source); } ]]> </fx:Script> <s:List id="list" width="300" doubleClick="onDoubleClick(event);" doubleClickEnabled="true" dataProvider="{items}"> </s:List> </s:Application>
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In this case, you send over the index of the selected item and the list of items as an array. Notice that you passed items.source instead of items since JavaScript will not read the ArrayCollection object type. Using the source property will return the array from the ArrayCollection. The JavaScript code on the other side looks like this:
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<script> function itemSelected( index, data ) { alert( [ index, data ] ); } </script>
It takes the two arguments, and then puts up an alert with the index and the data. When you run this from Flash Builder 4 and double-click an item, you should see something like Figure 9-7.
Figure 9-7. The more complex Javascript callback As you can see, integers strings, and arrays come over just fine.
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Calling from JavaScript Into Flex
Now that you know how to call from Flex into JavaScript, you need to learn how to go the other way. To demonstrate, you will allow the JavaScript on the page to dynamically add items to a Flex control using an addItem method that you will export through the ExternalInterface. Following is the code for this JavaScript-driven Flex application:
< xml version="1.0" encoding="utf-8" > <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[ import mx.collections.ArrayCollection; private var itemsList:ArrayCollection= new ArrayCollection(); protected function creationCompleteHandler():void { ExternalInterface.addCallback( "addItem", function(str:String):void { itemsList.addItem(str); list.dataProvider = itemsList; }); ExternalInterface.call( 'jscallinLoaded' ); } ]]> </fx:Script> <s:List id="list" width="200" height="250" /> </s:Application>
The Flex application is fairly simple. When it starts up, it registers the addItem method as a function that will add an item to an array and then update the dataProvider on the list with the new array. The Flex application then calls the jscallinLoaded function in the JavaScript code to let it know that the Flash application has been loaded successfully. The JavaScript code on the page that uses this Flex application is shown in the following code:
<script> function jscallinLoaded() { document.getElementById( 'JavaScriptCallingFlexExample' ). addItem( 'Carrots' ); document.getElementById( 'JavaScriptCallingFlexExample' ). addItem( 'Corn' );
document.getElementById( 'JavaScriptCallingFlexExample' ). addItem( 'Peas' ); } </script>
Note that the element name in the JavaScript code needs to match the SWF / application name so it can retrieve the object. We called the project: JavaScriptCallingFlexExample. When you run this in Flash Builder 4, you should see something like Figure 9-8.
Figure 9-8. The JavaScript-driven Flex application You might be asking yourself, why call out to JavaScript only to have it call back Can t the JavaScript call in directly It could, if the Flex application were loaded. But the loading sequence can vary from browser to browser and between operating systems. We have found that the most predictable way to know that a Flash application has been loaded is for it to call back into the JavaScript layer.
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