Baseline Widely available
Note: This feature is available in Web Workers.
The read-only numberValue property of the XPathResult interface returns the numeric value of a result with XPathResult.resultType being NUMBER_TYPE.
The return value is the numeric value of the XPathResult returned by Document.evaluate().
In case XPathResult.resultType is not NUMBER_TYPE, a DOMException of type TYPE_ERR is thrown.
The following example shows the use of the numberValue property.
<div>XPath example</div>
<div>Number of <div>s: <output></output></div>
const xpath = "count(//div)";
const result = document.evaluate(
xpath,
document,
null,
XPathResult.NUMBER_TYPE,
null,
);
document.querySelector("output").textContent = result.numberValue;
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