java code 39 barcode The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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The document subtree after replaceChild()
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Figure 3-7 illustrates this HTML fragment s node structure To swap the positions of List Item A and List Item B, you can use the following function, written using the JavaScript language binding for the DOM:
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function swapItems() { // get the element whose id is "node2" var theNode = documentgetElementById("node2"); var theParent = theNodeparentNode; var tempNode = theNodepreviousSibling; theParentremoveChild(theNode); theParentinsertBefore(theNode, tempNode); }
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Document structure for ordered list fragment
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3: Navigating and Manipulating Structured Documents
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The first line of the function retrieves the LI node with the ID attribute "node2" You then use the parent of this node to perform the operation of swapping its children In fact, the call to removeChild() is actually superfluous; the node would have been removed anyway by the call to insertBefore() because it was already in the tree The result of this operation is shown in Figure 3-8 Swapping nodes is actually a common enough operation that Internet Explorer provides a method for it called (appropriately enough) swapNode() It has this interface definition:
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Node swapNode(in Node refNode) raises (DOMException);
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The swapNode() method swaps the node from which this method is called with the node specified by the refNode argument, which does not need to be a child node It returns a reference to the node on which this method was invoked Using the swapNode() method, the previous example becomes even simpler:
function swapItems() { // get the element whose id is "node2" var theNode = documentgetElementById("node2"); var tempNode = theNodepreviousSibling; theNodeswapNode(tempNode); }
Figure 3-8
The ordered list fragment after swapping
The Document Object Model: Processing Structured Documents
Creating New Nodes
Of course, it probably won t be enough for your application to inspect and rearrange existing nodes At some point, you ll need to create new ones to insert into the document The DOM provides different ways of doing this You can create new nodes from scratch or duplicate existing nodes in the document
Using the Factory Methods
Usually, in most object-oriented programming languages, you create a new object by using the new operator with the type of object you want to create, like this:
var obj = new SomeDocumentObject();
This doesn t work with the DOM because there are some language bindings that do not support the new operator To make these cases easier to handle, the DOM uses special methods called factory methods that are responsible for creating new nodes It is then up to the implementation to handle the actual memory management involved with creating these new nodes Each type of node has an associated factory method For example, to create a new Text node, you would write the following code:
var newTextNode = documentcreateTextNode("This is the node content");
After a node has been created, it is in a state of limbo; it is not actually inserted into the document tree anywhere but is just sort of floating in space You need to attach it to the document tree using one of the node manipulation methods discussed earlier, such as appendChild() Table 3-5 lists the different factory methods that the DOM provides for creating new Document nodes Method
Element createElement(in DOMString tagName) DocumentFragment createDocumentFragment() Comment createComment(in DOMString data) Table 3-5
Description
Creates a new Element node of the type supplied by tagName Creates a new empty DocumentFragment node Creates a new Comment node whose content is given by the data argument
Factory Methods for Creating New Document Nodes
3: Navigating and Manipulating Structured Documents
Method
Text createTextNode(in DOMString data)
Description
Creates a new Text node whose content is given by the data argument
CDATASection Creates a CDATA section whose content is createCDATASection(in DOMString supplied by the data argument data) Creates a new ProcessingInstruction node ProcessingInstruction createProcessingInstruction(in with the given target and data DOMString target, in DOMString data) Attr createAttribute(in DOMString name) EntityReference createEntityReference(in DOMString name) Table 3-5 Creates a new Attr node with the given name Creates a new EntityReference node The name of the entity to reference is the given name
Factory Methods for Creating New Document Nodes (continued)
Suppose you want to create a new ordered list structure like the one shown earlier in Figure 3-7, and you want to insert it as the first child of the <BODY> tag To accomplish this, you need to create each node, set its content, and add the whole thing to the <BODY> tag The following listing demonstrates the necessary steps to do this
// declare some temporary variables to hold the LI nodes var newLI, newText; // create the new ordered list var newOL = documentcreateElement("OL"); // now create each new element Start with List Item A newLI = documentcreateElement("LI"); newText = documentcreateTextNode("List Item A"); // add the text to the LI node newLIappendChild(newText); // add the LI node to the ordered list newOLappendChild(newLI); newLI = documentcreateElement("LI"); // now do the same for List Item B newText = documentcreateTextNode("List Item B"); newLIappendChild(newText); newOLappendChild(newLI); newLI = documentcreateElement("LI"); // now do the same for List Item C
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