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the service call The makeObjectsBindable object is of type Boolean and is by default true. This flag determines whether the returned object should be bindable or not. In the default case, this property leads to an object type being wrapped in an ObjectProxy and an array type being wrapped in an ArrayCollection. In this example, the tree of objects maps to underlying XML. This tree of objects, which is returned as the response of the HTTP request, is assigned as the data provider of the data grid. Such an object structure is the default response data type for HTTP requests made using the Flex HTTPService object. However, you don t always have to rely on defaults and don t have to handle returning data as an object tree. You have ample choices. You can set the resultFormat property to array, xml, flashvars, text, and e4x (ECMAScript for XML) to get data in alternative formats. For example, if you specify the resultFormat as e4x and use the corresponding syntax and expressions to access the data, the example is marginally modified as follows:
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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/halo" minWidth="1024" minHeight="768"> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> <mx:HTTPService id="myHTTPService" url="http://localhost:8080/NBAScorers/" resultFormat="e4x"/> </fx:Declarations> <s:SkinnableContainer> <s:layout> <s:VerticalLayout horizontalAlign="center" paddingLeft="40" paddingTop="40" /> </s:layout> <mx:DataGrid dataProvider="{myHTTPService.lastResult.scorer as XMLList}" width="100%" height="100%" rowCount="10"> <mx:columns> <mx:DataGridColumn headerText="First Name" dataField="firstName"/> <mx:DataGridColumn headerText="Last Name" dataField="lastName"/> <mx:DataGridColumn headerText="Position" dataField="position"/> <mx:DataGridColumn headerText="Scorer Id" dataField="@scorerId"/> <mx:DataGridColumn headerText="Total Score" dataField="totalScore"/> </mx:columns> </mx:DataGrid> <mx:Button label="Invoke HTTPService" click="myHTTPService.send()"/> </s:SkinnableContainer> </s:Application>
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When resultFormat is set to type e4x, the lastResult is set to type XML and points to the root node of the document. Therefore, you don t need to refer to the collection as myHTTPService.lastResult. topScorers.scorer; you can simply access it as myHTTPService.lastResult.scorer. In legacy ActionScript, that is, the version prior to ActionScript 3.0 (AS3), the flash.xml.XMLNode class represented an XML fragment. This is a bit clumsy considering that an XML fragment contained in a larger XML document is also XML. So the use of this class is now deprecated. However, you may still want to
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use it for some reason, such as backward compatibility. In such a scenario, you need the lastResult object returned as an XMLNode, not an XML object. You can achieve this by setting resultFormat to xml and not e4x. Similarly, if you want the result to be in an array or a set of name-value pairs or plain text, you can accomplish this by setting resultFormat to array, flashvars, or text, respectively. So far, we ve done almost everything in MXML. Now let s switch gears to ActionScript. This time, let s recode the example using ActionScript only for the HTTPService component as follows:
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/* topscorers_as.mxml */ < 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/halo" minWidth="1024" minHeight="768"> <fx:Script> <![CDATA[ import mx.controls.Alert; import mx.rpc.events.FaultEvent; import mx.rpc.events.ResultEvent; import mx.collections.XMLListCollection; import mx.rpc.http.HTTPService; import mx.controls.DataGrid; private var myHTTPService:HTTPService; private var myDataGrid:DataGrid = new DataGrid(); public function useHttpService():void { trace("useHttpService invoked"); myHTTPService = new HTTPService(); myHTTPService.url = " http://localhost:8080/NBAScorers/topscorers.jsp"; myHTTPService.method = "GET"; myHTTPService.addEventListener("result", resultHandler); myHTTPService.addEventListener("fault", faultHandler); myHTTPService.send(); } public function resultHandler(event:ResultEvent):void { trace("resultHandler invoked"); var result:Object = event.result; myDataGrid.dataProvider = result.topScorers.scorer; myDataGrid.percentWidth = 100; myDataGrid.percentHeight = 100; myDataGrid.rowCount = 10; myVBox.addChild(myDataGrid); //Do something with the result. } private function faultHandler(event:FaultEvent):void { trace("faultHandler Invoked"); Alert.show('Oops there is a problem!....' + event.fault.message); } ]]>
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</fx:Script> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <s:SkinnableContainer id="skinnableContainer"> <s:layout> <s:VerticalLayout horizontalAlign="center" paddingLeft="40" paddingTop="40" /> </s:layout> <mx:VBox id="myVBox" width="100%" height="100%" /> <mx:Button label="Invoke HTTPService" click="useHttpService()"/> </s:SkinnableContainer> </s:Application>
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That wasn t too different from what we did using MXML. The example is simple so things remained straightforward, even when we switched over to ActionScript. In real-life situations, you may want to do a few other things to make your applications work:
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Make POST calls as well as GET calls. Send parameters along with the request. Invoke URL(s) that are accessible over the secure HTTPS protocol. Implement a notion of a user session for purposes like authentication or personalization. Invoke URL(s) that originate from domains that define a security policy using crossdomain.xml. Invoke URL(s) that originate from domains that don t define a security policy. Make HTTP requests that require header manipulation.
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