c# create and print barcode USING FLASH TO DISPLAY XML in Font

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CHAPTER 10 USING FLASH TO DISPLAY XML
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If you re not familiar with Flash, you can generate a web page that displays the SWF file by choosing Tip
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File Publish. Flash will create the web page in the same folder as the SWF file.
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In this example, you saw how to load an XML document into Flash and display it in UI components. You can also use Flash to update content and send it to a server-side file for processing.
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Updating XML Content in Flash
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As you saw earlier in this chapter, Flash can use methods such as createNode(), appendNode(), insertBefore(), and cloneNode() to manipulate an XML tree. The manipulation takes place within Flash, but if you need to update an external data source, you ll have to send the content to a server-side file for processing. I ll work through an example where I take user input and use it to update the dvd.xml document tree within Flash. You can find this example saved in the file dvd3.fla. Figure 10-5 shows the interface populated with the dvd.xml file.
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Figure 10-5. The interface of the dvd3.fla movie This interface allows you to view the details of a DVD, add a new DVD to the XML tree, and edit or remove an existing DVD. If you open Frame 1 of the actions layer with the F9 shortcut key, you ll see that it s a little more complicated than the previous example. To start with, there are now three timeline variables: var rootNode:XMLNode; var selectedDVDNode:XMLNode; var booNew:Boolean = true; The added third line creates a Boolean variable that determines whether to add a new node or to edit an existing node.
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CHAPTER 10 USING FLASH TO DISPLAY XML
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The processXML()function is almost identical to the previous example. When it calls the loadList() function, it passes null, signifying that a DVD has not yet been selected. The loadList() function works a little differently from the previous example. This time it displays a string representation of the complete XMLNode object in the List component. The new and changed lines appear in bold in the following code block: function loadList(theNodeIndex:Number):Void { dvd_list.removeAll(); var dvdNode:XMLNode; for (var i:Number=0; i < rootNode.childNodes.length; i++) { dvdNode = rootNode.childNodes[i]; dvd_list.addItem(dvdNode.toString()); } if (theNodeIndex != null) { dvd_list.selectedIndex = theNodeIndex; } } The toString() method displays the content of each element within the List component. The new example includes onRelease handlers for each of the three buttons: Clear, Update, and Delete. The Clear button clears the selection: clear_btn.onRelease = function():Void { dvd_list.selectedIndex = undefined; selectedDVDNode = null; booNew = true; clearTextInputs(); } The function starts by removing the selection from the dvd_list component: dvd_list.selectedIndex = undefined; It then clears the selectedDVDNode variable by setting the value to null. The function sets the booNew variable to true and then calls the clearTextInputs() function to remove the text from the interface. The clearTextInputs() function follows: function clearTextInputs():Void { title_txt.text = ""; format_txt.text = ""; genre_txt.text = ""; } Clicking the Update button calls the doUpdate() function. This function either adds a new record to the XML tree or updates the currently selected element, depending on the value of the booNew variable.
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CHAPTER 10 USING FLASH TO DISPLAY XML
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The doUpdate()function follows: function doUpdate():Void { if (booNew) { if (title_txt.text.length > 0) { var newDVD:XMLNode = oXML.createElement("DVD"); newDVD.attributes.id = rootNode.childNodes.length + 1; var newDVDTitle:XMLNode = oXML.createElement("title"); newDVDTitle.appendChild(oXML.createTextNode(title_txt.text)); newDVD.appendChild(newDVDTitle); if (format_txt.text.length > 0) { var newDVDFormat:XMLNode = oXML.createElement("format"); newDVDFormat.appendChild(oXML.createTextNode(format_txt.text)); newDVD.appendChild(newDVDFormat); } if (genre_txt.text.length > 0) { var newDVDGenre:XMLNode = oXML.createElement("genre"); newDVDGenre.appendChild(oXML.createTextNode(genre_txt.text)); newDVD.appendChild(newDVDGenre); } rootNode.appendChild(newDVD); loadList(null); clearTextInputs(); } } else { var selectedNodeIndex:Number = Number(selectedDVDNode.attributes.id)-1; if (title_txt.text.length > 0) { selectedDVDNode.childNodes[0].firstChild.nodeValue = title_txt.text; } if (format_txt.text.length > 0) { selectedDVDNode.childNodes[1].firstChild.nodeValue = format_txt.text; } if (genre_txt.text.length > 0) { selectedDVDNode.childNodes[2].firstChild.nodeValue = genre_txt.text; } loadList(selectedNodeIndex); } } You can divide the function into two areas the first section adds a new record, and the second edits an existing record. If you re adding a new record (booNew is true), the code tests whether the record has a title. The function won t proceed unless a title exists: if (title_txt.text.length > 0) {
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