XPathResult.numberValue - Web APIs 编辑

The read-only numberValue property of the XPathResult interface returns the numeric value of a result with XPathResult.resultType being NUMBER_TYPE.

Note:

Syntax

var value = result.numberValue;

Return value

The return value is the numeric value of the XPathResult returned by Document.evaluate().

Exceptions

TYPE_ERR

In case XPathResult.resultType is not NUMBER_TYPE, an XPathException of type TYPE_ERR is thrown.

Example

The following example shows the use of the numberValue property.

HTML

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

JavaScript

var xpath = "count(//div)";
var result = document.evaluate(xpath, document, null, XPathResult.NUMBER_TYPE, null);
document.querySelector("output").textContent = result.numberValue;

Result

Specifications