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the purpose of the Factory pattern is to determine which type to instantiate at runtime. That way, when the resulting object is referenced, the methods being queried should exist. The downside to dynamic languages is that you don t know whether your code works until you actually test it. There is no such thing as a JavaScript compiler, and hence it is not possible to know if your code works or does not work. This is partially what can make developing with JavaScript tedious as you may have to wade through a series of syntax errors before being able to test and debug your source code. However, do not think that JavaScript is an environment where you need to use printouts to see what the code is doing. Mozilla includes a very sophisticated and useful debugger that makes it simple to figure out what your JavaScript code is doing.

if ( thumb.exists && movie.exists ) movieList.push( { thumbnail: thumb, movie: movie } ); } localList.dataProvider = movieList; } ]]> </fx:Script> <fx:Declarations> <mx:HTTPService id="srchYoutube" url="http://gdata.youtube.com/feeds/api/videos/ vq= {escape(txtSearch.text)}&orderby=updated" resultFormat="e4x" result="onSearchResult( event );" /> </fx:Declarations> <mx:HDividedBox width="100%" height="100%"> <mx:Panel width="40%" title="Search" height="100%" paddingBottom="5" paddingLeft="5" paddingRight="5" paddingTop="5"> <mx:HBox width="100%"> <mx:TextInput id="txtSearch" text="lady gaga" width="100%" /> <mx:Button label="Search" click="onSearch()" /> </mx:HBox> <mx:TileList id="srchFound" width="100%" height="100%" doubleClickEnabled="true" doubleClick="downloadVideo()"> <mx:itemRenderer> <fx:Component> <mx:HBox paddingBottom="5" paddingLeft="5" paddingRight="5" paddingTop="5"> <mx:Image source="{data.thumbnail}" toolTip="{data.description}" height="100" width="130"> </mx:Image> </mx:HBox> </fx:Component> </mx:itemRenderer> </mx:TileList> </mx:Panel> <mx:Panel width="60%" height="100%" title="Offline Videos" paddingBottom="5" paddingLeft="5" paddingRight="5" paddingTop="5"> <mx:HorizontalList id="localList" width="100%" doubleClickEnabled="true" doubleClick="playVideo()"> <mx:itemRenderer> <fx:Component> <mx:HBox paddingBottom="5" paddingLeft="5" paddingRight="5" paddingTop="5"> <mx:Image source="{data.thumbnail.url}" height="100" width="130">

Figure 10-1. The command menu of the old version of Dungeon and the new version of Dungeon running on a large-screen emulator with Locale (language) set to French

</mx:Image> </mx:HBox> </fx:Component> </mx:itemRenderer> </mx:HorizontalList> <mx:HBox width="100%" height="100%" verticalAlign="middle" horizontalAlign="center"> <mx:VideoDisplay id="movieDisplay" width="400" height="300" /> </mx:HBox> </mx:Panel> </mx:HDividedBox> </s:WindowedApplication>

Getting back to the Factory pattern and instantiation of XMLHttpRequest, the pattern is needed because each browser (for example, Firefox, Internet Explorer, and Safari) has a different way of instantiating the XMLHttpRequest object, and using the Factory pattern is the only way to mask the decision of the object instantiation. If you search the Internet (query XMLHttpRequest factory ), you ll find a multitude of techniques proposed to abstract the instantiation of XMLHttpRequest. As much as I would like to reference a toolkit or factory, there is a problem with doing so. A web browser is by default a cross-platform end client, or at least mostly a cross-platform end client. Using a comprehensive toolkit to create cross-browser applications is like creating a cross-platform toolkit for the E B V N Java environment. Like the Web, Java is cross-platform, and adding a layer on top complicates development and distribution of the application. The aim of this book is to focus on those methods, properties, and objects that are cross-browser compatible and when necessary introduce very lightweight functions or classes. The instantiation of the XMLHttpRequest object is an example where it is necessary to introduce a lightweight function. The XMLHttpRequest Factory pattern is illustrated as follows: function FactoryXMLHttpRequest() { if(window.XMLHttpRequest) { return new XMLHttpRequest(); } else if(window.ActiveXObject) { var msxmls = new Array( 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'Msxml2.XMLHTTP.3.0', 'Msxml2.XMLHTTP', 'Microsoft.XMLHTTP'); for (var i = 0; i < msxmls.length; i++) { try { return new ActiveXObject(msxmls[i]); } catch (e) { } } } throw new Error("Could not instantiate XMLHttpRequest"); }

If you notice from the script, you are calling a php proxy to extract the FLV video from YouTube. At the time of writing, the proxy works. However, YouTube is changing often and the script may stop working. In case this happened, you will have to find a new PHP proxy to replace this one. Place the proxy on your local server or web server.

As you ve seen throughout this book, handling the differences between one platform and the next is a constant problem that you always need to keep in mind. It comes up in obvious ways when writing a GUI as you choose what sizes and kinds of graphics are appropriate and optimize the use of resources for a given handset. Less obvious issues also come up such as identifying different keypress actions using keycodes, as you ll see in the Implementing Softkeys section later in this chapter. And while you re customizing your labels and other strings, it s a good time to think about adding custom labels for different languages as well.