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TreeWalkers, like NodeIterators, allow you to navigate among the nodes of a document subtree Unlike NodeIterators, however, TreeWalkers preserve the document s tree hierarchy In fact, using a TreeWalker is almost exactly the same as using the node navigation properties of the base Node interface itself, and the provided methods are analogous to those provided by the Node interface One major difference between TreeWalkers and NodeIterators is that TreeWalkers do not have the notion of a position Instead, TreeWalkers are attached to the node that they are currently operating on This will be discussed in detail later TreeWalkers have the following interface definition:
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interface TreeWalker readonly attribute readonly attribute readonly attribute readonly attribute attribute { Node root; unsigned long whatToShow; NodeFilter filter; boolean expandEntityReferences; Node currentNode; // raises(DOMException) on setting parentNode(); firstChild(); lastChild(); previousSibling();
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Node Node Node Node
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The Document Object Model: Processing Structured Documents
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Node Node Node }; nextSibling(); previousNode(); nextNode();
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The root property contains the root node of this iterator, as specified when the iterator was created The whatToShow property determines what types of nodes are visible to the iterator The available values for this property are listed under the NodeFilter interface (discussed earlier in the Node Filters section) The filter property is an optional NodeFilter that can be used to further screen nodes When both whatToShow and filter are used, the whatToShow property takes precedence The expandEntityReferences property determines whether the children of EntityReference nodes are visible to the iterator The currentNode property is the node at which the TreeWalker is currently positioned The parentNode() method returns the closest visible ancestor node of the TreeWalker s current node and sets currentNode to its parent node If currentNode has no parent node, null is returned and the current node is not changed The firstChild() method moves the TreeWalker to the first visible child of currentNode and returns the new node It returns null if currentNode has no visible children and the current node is not changed The lastChild() method moves the TreeWalker to the last visible child of currentNode and returns the new node It returns null if currentNode has no visible children and the current node is not changed The previousSibling() method moves the TreeWalker to the previous sibling of currentNode and returns the new node It returns null if currentNode has no visible previous sibling and the current node is not changed The nextSibling() method moves the TreeWalker to the next sibling of currentNode and returns the new node It returns null if currentNode has no visible next sibling and the current node is not changed The nextNode() method moves the TreeWalker to the next visible node in document order relative to currentNode and returns the new node It returns null if currentNode has no next node, or if the search for the next node attempts to step upward from the TreeWalker s root node and retains the current node The previousNode() method moves the TreeWalker to the previous visible node in document order relative to currentNode, and returns the new node It returns null if currentNode has no previous node, or if the search for the previous node attempts to step upward from the TreeWalker s root node and retains the current node Navigating Documents with TreeWalkers Let s examine the effects of document traversal using a TreeWalker on the same example document we used earlier for the NodeIterator Recall that our example document had the structure shown in Figure 3-11
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3: Navigating and Manipulating Structured Documents
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Figure 3-11
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Document structure of the example XML fragment
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Suppose we create a TreeWalker and assign node4 as its root This also assigns node4 as the current node, as shown in Figure 3-12 A call to any method that would cause the TreeWalker to step above the root node will return null, such as parentNode() Calling firstChild() will return node5 and will also set node5 as the new current node Because node5 has no child nodes, subsequent calls to firstChild() will return null and leave node5 as the current node You can also call methods that allow the TreeWalker to behave like NodeIterator, such as nextNode() and previousNode() If node4 is the current node, calling nextNode() will return node5 Calling nextNode() again will return node6 Calling previousNode() will move the TreeWalker back to node5 Using the TreeWalker interface, we can rewrite the recursive document traversing logic that we wrote earlier using the Node interface methods The only change we have to make is to ensure that the current node is restored by the processing function because calling TreeWalker navigation methods will change the currentNode property This is easily handled by saving aside the current node at the start of the function and restoring it before the function completes
Figure 3-12
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