Baseline Widely available
This method compiles an XPathExpression which can then be used for (repeated) evaluations of the XPath expression.
createExpression(expression)
createExpression(expression, resolver)
expression
A string representing the XPath expression to be created.
resolver Optional
A Node, null, or any object implementing the lookupNamespaceURI method. Permits translation of all prefixes, including the xml namespace prefix, within the XPath expression into appropriate namespace URIs.
A XPathExpression representing the compiled form of the XPath expression.
If the expression is not legal according to the rules of the XPathEvaluator, a DOMException of type INVALID_EXPRESSION_ERR is raised.
If the expression contains namespace prefixes which cannot be resolved by the specified XPathNSResolver, a DOMException of type NAMESPACE_ERROR is raised.
The following example shows the use of the evaluate() method.
<div>XPath example</div>
<div>Number of <div>s: <output></output></div>
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;
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