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The attributes property returns an object containing all of the attributes of the specified XMLNode object: oXMLNode.attributes You can loop through all attributes within the XMLNode using this code: for (var theAtt:String in oXMLNode.attributes) { ..//process attributes }
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parentNode
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The parentNode property returns the XMLNode that is the parent of the current node: oXMLNode.parentNode Remember that attributes don t have a parent node, as they are not the children of their containing element. If the node doesn t have a parent, it returns null.
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The childNodes property returns an array of child XMLNode objects: oXMLNode.childNodes You can refer to a specific child node by using its position within the collection: oXMLNode.childNodes[0] The previous line refers to the first child node of the oXMLNode element. You can find out how many child nodes exist within an element by using the length property: oXMLNode.childNodes.length This allows you to loop through the collection: for (var i:Number=0; i < oXMLNode.childNodes.length; i++) { //do something } As text nodes don t have child nodes, this property will return undefined.
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CHAPTER 10 USING FLASH TO DISPLAY XML
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The firstChild and lastChild properties return the first and last XMLNode objects in the XMLNode s list of child nodes: oXMLNode.firstChild oXMLNode.lastChild If there are no children, the lastChild property returns null. Note that text nodes are always the first child of their containing element.
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These properties return the previous and next XMLNode objects that share the same parent as the current XMLNode object: oXMLNode.previousSibling oXMLNode.nextSibling
nodeType
Unlike the XML DOM property of the same name, this property returns a value of either 1 (element node) or 3 (text node) for the specified XMLNode: oXMLNode.nodeType Flash doesn t support the other numeric node type indicators from the recommendation.
nodeName
The nodeName property returns the name of the current XMLNode object: oXMLNode.nodeName Text nodes don t have a nodeName property. XMLNodes with a nodeType of 3 i.e., text nodes will return null.
nodeValue
The nodeValue property returns the content of the specified text node: oXMLNode.firstChild.nodeValue The preceding line finds the text within the oXMLNode element. Note that the text node is the firstChild of the XMLNode object. The property returns null for an element node (nodeType = 1).
hasChildNodes()
The hasChildNodes()method returns a Boolean value that indicates whether an XMLNode object has child elements: oXMLNode.hasChildNodes()
CHAPTER 10 USING FLASH TO DISPLAY XML
appendChild(newChild:XMLNode)
The appendChild()method adds a new child after the last child node of the current XMLNode object. You can use this method to append a node that you ve just created: oNewNode = oXML.createElement("dvd"); oXML.childNodes[0].appendChild(oNewNode); You can also use the method to move an existing node to a new location.
cloneNode(deep:Boolean)
The cloneNode()method clones an existing XMLNode object. It copies all attributes within the node. Set the deep parameter to true to clone all child nodes recursively: oXML.oXMLNode.cloneNode(true) The method returns the cloned node without a parent. You ll need to use appendChild() or insertBefore() to locate it within the document tree.
insertBefore(newChild:XMLNode, insertPoint:XMLNode)
This method inserts a new XMLNode object before an existing XMLNode object: var oOldNode:XMLNode = oXML.firstChild.childNode[1]; var oNewNode:XMLNode = oXML.createElement("dvd"); oXML.insertBefore(oNewNode, oOldNode); If insertPoint is not a child of the XMLNode object, the insert will fail.
removeNode()
The removeChild()method removes the specified XMLNode. It returns nothing: var nodeToRemove:XMLNode = oXML.firstChild.childNodes[2]; nodeToRemove.removeNode();
Loading and Displaying XML Content in Flash
In the previous section, I covered the methods and properties that are available to you when working with XML content in Flash. These will make much more sense if I work through an example. The example file dvd2.fla shows how to load the dvd.xml file into Flash and display the details of a selected DVD in UI components. Figure 10-2 shows this movie with a selected DVD.
CHAPTER 10 USING FLASH TO DISPLAY XML
Figure 10-2. Displaying XML content in UI components I ll walk through this example so you can see how to traverse the document tree. The example will also show you how to work with the UI components in Flash. Open the dvd2.fla file in Flash 8, and you ll see a number of UI components on the Stage. If you re not familiar with Flash, clicking each component displays its name in the Properties panel at the bottom of the screen. Figure 10-3 shows the Properties panel with the List component selected. I can refer to a component using this name.
Figure 10-3. The Properties panel showing a component instance name You ll also see two layers in the timeline in the top left-hand corner of the screen. Select Frame 1 of the actions layer, as shown in Figure 10-4.
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