Document: createExpression() method

This method compiles an XPathExpression which can then be used for (repeated) evaluations.

You must call this method on the same document that you run the expression against.

Syntax

createExpression(xpathText, namespaceURLMapper)

Parameters

xpathText

A string which is the XPath expression to be compiled.

namespaceURLMapper

A function which maps a namespace prefix to a namespace URL (or null if none needed).

Return value

Examples

const xpathExpr = document.createExpression("//div");
const xpathResult = xpathExpr.evaluate(document); // returns an XPathResult object
const nodeContext = document.querySelector("nav");
// Re-using the XPathExpression "xpathExpr"
const otherResult = xpathExpr.evaluate(nodeContext); // returns an XPathResult object

Specifications

• DOM

See also

• Document.evaluate()
• XPathExpression