XPathExpression

This interface is a compiled XPath expression that can be evaluated on a document or specific node to return information from its DOM tree.

This is useful when an expression will be reused in an application, because it is just compiled once and all namespace prefixes which occur within the expression are preresolved.

Objects of this type are created by calling XPathEvaluator.createExpression().

Instance methods

XPathExpression.evaluate(): Evaluates the XPath expression on the given node or document.

Example

The following example shows the use of the XPathExpression interface.

HTML

html

<div>XPath example</div>
<div>Number of &lt;div&gt;s: <output></output></div>

JavaScript

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-xpathexpression

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`XPathExpression`	1	12	1	No	≤12.1	3	4.4	18	4	≤12.1	1	1.0
`evaluate`	1	12	1	No	≤12.1	3	4.4	18	4	≤12.1	1	1.0

Docs

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