XPathEvaluator
The XPathEvaluator interface allows to compile and evaluate XPath expressions.
Constructor
XPathEvaluator()-
Creates a new
XPathEvaluatorobject.
Instance 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
Count the number of <div> elements
The following example shows the use of the XPathEvaluator interface.
HTML
html
<div>XPath example</div>
<div>Number of <div> elements: <output></output></div>
JavaScript
js
const xpath = "//div";
const evaluator = new XPathEvaluator();
const expression = evaluator.createExpression(xpath);
const result = expression.evaluate(
document,
XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,
);
document.querySelector("output").textContent = result.snapshotLength;
Result
Specifications
| Specification |
|---|
| DOM Standard # interface-xpathevaluator |
Browser compatibility
| desktop | mobile | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
XPathEvaluator | |||||||||||
XPathEvaluator() constructor | |||||||||||
createExpression | |||||||||||
createNSResolver | |||||||||||
evaluate | |||||||||||