XPathResult

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.

特性

XPathResult.booleanValue 只读
A boolean representing the value of the result if resultType is BOOLEAN_TYPE .
XPathResult.invalidIteratorState 只读
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.numberValue 只读
A number representing the value of the result if resultType is NUMBER_TYPE .
XPathResult.resultType 只读
A number code representing the type of the result, as defined by the type constants.
XPathResult.singleNodeValue 只读
A Node representing the value of the single node result, which may be null .
XPathResult.snapshotLength 只读
The number of nodes in the result snapshot.
XPathResult.stringValue 只读
A string representing the value of the result if resultType is STRING_TYPE .

方法

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.

常量

Result Type Defined Constant 描述
ANY_TYPE 0 A 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_TYPE 1 A result containing a single number. This is useful for example, in an XPath expression using the count() 函数。
STRING_TYPE 2 A result containing a single string.
BOOLEAN_TYPE 3 A result containing a single boolean value. This is useful for example, in an XPath expression using the not() 函数。
UNORDERED_NODE_ITERATOR_TYPE 4 A 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_TYPE 5 A 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_TYPE 6 A 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_TYPE 7 A 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_TYPE 8 A 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_TYPE 9 A result node-set containing the first node in the document that matches the expression.

规范

规范 状态 Comment
Document Object Model (DOM) Level 3 XPath Specification
The definition of 'XPathResult' in that specification.
Recommendation 初始定义

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
XPathResult Chrome Yes Edge ≤18 Firefox Yes IE ? Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android Yes Opera Android Yes Safari iOS ? Samsung Internet Android Yes
invalidIteratorState Chrome Yes Edge 12 Firefox Yes IE ? Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android Yes Opera Android Yes Safari iOS ? Samsung Internet Android Yes
iterateNext Chrome Yes Edge 12 Firefox Yes IE ? Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android Yes Opera Android Yes Safari iOS ? Samsung Internet Android Yes
resultType Chrome Yes Edge 12 Firefox Yes IE ? Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android Yes Opera Android Yes Safari iOS ? Samsung Internet Android Yes
snapshotItem Chrome Yes Edge 12 Firefox Yes IE ? Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android Yes Opera Android Yes Safari iOS ? Samsung Internet Android Yes

图例

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另请参阅