Element: hasAttributeNS() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The hasAttributeNS() method of the Element interface returns a boolean value indicating whether the current element has the specified attribute with the specified namespace.

If you are working with HTML documents and you don't need to specify the requested attribute as being part of a specific namespace, use the hasAttribute() method instead.

Syntax

hasAttributeNS(namespace,localName)

Parameters

namespace: A string specifying the namespace of the attribute.
localName: The name of the attribute.

Return value

A boolean.

Examples

// Check that the attribute exists before you set a value
const d = document.getElementById("div1");
if (
 d.hasAttributeNS("http://www.mozilla.org/ns/specialspace/", "special-align")
) {
 d.setAttribute("align", "center");
}