c# create and print barcode Figure 10-4. Selecting Frame 1 of the actions layer in Font

Draw Data Matrix in Font Figure 10-4. Selecting Frame 1 of the actions layer

Figure 10-4. Selecting Frame 1 of the actions layer
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CHAPTER 10 USING FLASH TO DISPLAY XML
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You can press the F9 shortcut key to see the actions added to this frame in the Actions panel. All of the ActionScript required to run this simple application appears on Frame 1 of this layer. I ll work through the code. The code starts by declaring timeline variables. These are similar to variables with global scope in a JavaScript code block: var rootNode:XMLNode; var selectedDVDNode:XMLNode; The rootNode variable stores a reference to the document element. In the dvd.xml file, that s the <library> element. The selectedDVDNode variable stores a reference to the DVD chosen by the user. The next code block loads the XML document and sets the onLoad event handler: var oXML:XML = new XML(); oXML.ignoreWhite = true; oXML.onLoad = processXML; oXML.load("dvd.xml"); When the dvd.xml document loads into Flash, it calls the processXML function. The function appears at the bottom of the Actions panel: function processXML(success:Boolean):Void{ if (success){ if (this.status == 0) { rootNode = this.firstChild; loadList(); } } } This function starts by testing that the XML document loaded successfully. It then checks the value of the status property to make sure that there are no errors. The remaining lines set the value of the rootNode variable to the first child of the loaded XML object, and call the loadList function: rootNode = this.firstChild; loadList(); Setting the rootNode variable is useful because it allows an application to access content from the XML document, without the XML declaration, from anywhere within the Flash movie. The loadList() function loads the content into the List component: function loadList():Void { dvd_list.removeAll(); var dvdID:Number; for (var i:Number=0; i < rootNode.childNodes.length; i++) { dvdID = rootNode.childNodes[i].attributes.id; dvd_list.addItem(dvdID); } }
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CHAPTER 10 USING FLASH TO DISPLAY XML
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The code starts by removing any existing items from the list. Then it declares a variable that will store the DVD id attribute value. The code loops through the childNodes array using a for loop. You ll notice that the construction is the same as within JavaScript: for (var i:Number=0; i < rootNode.childNodes.length; i++) { As in the previous chapters, the code uses the length property of the childNodes array to determine the end point for the loop. Within the loop, the code determines the id attribute value using this code: dvdID = rootNode.childNodes[i].attributes.id; This code finds the relevant childNode array element and finds the id property within the attributes collection. Finally, the addItem() method adds the id attribute to the dvd_list List component: dvd_list.addItem(dvdID); The other block of code within the Actions panel responds to the user making a selection from the List component: var dvdListener:Object = new Object(); dvdListener.change = function(evtObj:Object):Void { var nodeIndex:Number = evtObj.target.selectedIndex; selectedDVDNode = rootNode.childNodes[nodeIndex]; title_txt.text = selectedDVDNode.childNodes[0].firstChild.nodeValue; format_txt.text = selectedDVDNode.childNodes[1].firstChild.nodeValue; genre_txt.text = selectedDVDNode.childNodes[2].firstChild.nodeValue; } dvd_list.addEventListener("change", dvdListener); The code defines an event listener object called dvdListener and adds it to the dvd_list component, listening for the change event. When the object detects the event, it determines which item the user selected and stores it within the nodeIndex variable: var nodeIndex:Number = evtObj.target.selectedIndex; It then uses that value to set an XMLNode object to reference the appropriate element in the XML object: selectedDVDNode = rootNode.childNodes[nodeIndex]; Finally, the function sets the text property of each TextInput component to the value from the appropriate element in the XML object. For example, the title comes from the first child node (childNodes[0]) of the <dvd> element. You can find the text by using the firstChild property of this element and determining the nodeValue: title_txt.text = selectedDVDNode.childNodes[0].firstChild.nodeValue; Testing the Flash document shows something similar to Figure 10-2. You should be able to select each DVD from the List component and see the title, format, and genre of each.
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