The XPathEvaluator
interface allows to compile and evaluate XPath expressions.
It is implemented by the Document
interface.
Methods
XPathEvaluator.createExpression()
- Creates a parsed XPath expression with resolved namespaces.
XPathEvaluator.createNSResolver()
- Adapts any DOM node to resolve namespaces allowing the XPath expression to be evaluated relative to the context of the node where it appeared within the document.
XPathEvaluator.evaluate()
- Evaluates an XPath expression string and returns a result of the specified type if possible.
Example
The following example shows the use of the XPathEvaluator
interface.
HTML
<div>XPath example</div>
<div>Number of <div>s: <output></output></div>
JavaScript
var xpath = "//div";
var evaluator = new XPathEvaluator();
var expression = evaluator.createExpression("//div");
var result = expression.evaluate(document, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE);
document.querySelector("output").textContent = result.snapshotLength;
Result
Specifications
Specification | Status | Comment |
Document Object Model (DOM) Level 3 XPath SpecificationThe definition of 'XPathEvaluator' in that specification. | Recommendation | Initial definition |
Browser compatibility
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See also
XPathEvaluator by Mozilla Contributors is licensed under CC-BY-SA 2.5.