class DOM.NodeFilter


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Module khtml
Namespace dom
Class DOM.NodeFilter
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Filters are objects that know how to "filter out" nodes. If an Iterator or TreeWalker is given a filter, before it returns the next node, it applies the filter. If the filter says to accept the node, the Iterator returns it; otherwise, the Iterator looks for the next node and pretends that the node that was rejected was not there.

The DOM does not provide any filters. Filter is just an interface that users can implement to provide their own filters.

Filters do not need to know how to iterate, nor do they need to know anything about the data structure that is being iterated. This makes it very easy to write filters, since the only thing they have to know how to do is evaluate a single node. One filter may be used with a number of different kinds of Iterators, encouraging code reuse.

To create your own custom NodeFilter, define a subclass of CustomNodeFilter which overrides the acceptNode() method and assign an instance of it to the NodeFilter. For more details see the CustomNodeFilter class



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