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XPathResult的定义

The XPathResult interface represents the results generated by evaluating an XPath expression within the context of a given node.

Since XPath expressions can result in a variety of result types, this interface makes it possible to determine and handle the type and value of the result.

Properties

XPathResult.booleanValueRead only
boolean representing the value of the result if resultType is BOOLEAN_TYPE.
XPathResult.invalidIteratorStateRead only
Signifies that the iterator has become invalid. It is true if resultType is UNORDERED_NODE_ITERATOR_TYPE or ORDERED_NODE_ITERATOR_TYPE and the document has been modified since this result was returned.
XPathResult.numberValueRead only
number representing the value of the result if resultType is NUMBER_TYPE.
XPathResult.resultTypeRead only
number code representing the type of the result, as defined by the type constants.
XPathResult.singleNodeValueRead only
Node representing the value of the single node result, which may be null.
XPathResult.snapshotLengthRead only
The number of nodes in the result snapshot.
XPathResult.stringValueRead only
string representing the value of the result if resultType is STRING_TYPE.

Methods

XPathResult.iterateNext()
If the result is a node set, this method iterates over it and returns the next node from it or null if there are no more nodes.
XPathResult.snapshotItem()
Returns an item of the snapshot collection or null in case the index is not within the range of nodes. Unlike the iterator result, the snapshot does not become invalid, but may not correspond to the current document if it is mutated.

Constants

Result Type Defined ConstantValueDescription
ANY_TYPE0A result set containing whatever type naturally results from evaluation of the expression. Note that if the result is a node-set then UNORDERED_NODE_ITERATOR_TYPE is always the resulting type.
NUMBER_TYPE1A result containing a single number. This is useful for example, in an XPath expression using the count() function.
STRING_TYPE2A result containing a single string.
BOOLEAN_TYPE3A result containing a single boolean value. This is useful for example, in an XPath expression using the not() function.
UNORDERED_NODE_ITERATOR_TYPE4A result node-set containing all the nodes matching the expression. The nodes may not necessarily be in the same order that they appear in the document.
ORDERED_NODE_ITERATOR_TYPE5A result node-set containing all the nodes matching the expression. The nodes in the result set are in the same order that they appear in the document.
UNORDERED_NODE_SNAPSHOT_TYPE6A result node-set containing snapshots of all the nodes matching the expression. The nodes may not necessarily be in the same order that they appear in the document.
ORDERED_NODE_SNAPSHOT_TYPE7A result node-set containing snapshots of all the nodes matching the expression. The nodes in the result set are in the same order that they appear in the document.
ANY_UNORDERED_NODE_TYPE8A result node-set containing any single node that matches the expression. The node is not necessarily the first node in the document that matches the expression.
FIRST_ORDERED_NODE_TYPE9A result node-set containing the first node in the document that matches the expression.
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