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Element: setAttributeNodeNS() method

setAttributeNodeNS adds a new namespaced attribute node to an element.

Syntax

js

setAttributeNodeNS(attributeNode)

Parameters

  • attributeNode is an Attr node.

Return value

The replaced attribute node, if any, returned by this function.

Examples

js

// <div id="one" xmlns:myNS="http://www.mozilla.org/ns/specialspace"
//            myNS:special-align="utterleft">one</div>
// <div id="two">two</div>

const myns = "http://www.mozilla.org/ns/specialspace";
const d1 = document.getElementById("one");
const d2 = document.getElementById("two");
const a = d1.getAttributeNodeNS(myns, "special-align");
d2.setAttributeNodeNS(a.cloneNode(true));
alert(d2.attributes[1].value); // returns: `utterleft'

Notes

If the specified attribute already exists on the element, then that attribute is replaced with the new one and the replaced one is returned.

Note that if you try to set without cloning the node, Mozilla gives an NS_ERROR_DOM_INUSE_ATTRIBUTE_ERR "Attribute already in use" error, as the DOM requires cloning for Attr to be reused (unlike other Nodes which can be moved).

DOM methods dealing with element's attributes:

Not namespace-aware, most commonly used methods Namespace-aware variants (DOM Level 2) DOM Level 1 methods for dealing with Attr nodes directly (seldom used) DOM Level 2 namespace-aware methods for dealing with Attr nodes directly (seldom used)
setAttribute (DOM 1) setAttributeNS setAttributeNode setAttributeNodeNS
getAttribute (DOM 1) getAttributeNS getAttributeNode getAttributeNodeNS
hasAttribute (DOM 2) hasAttributeNS - -
removeAttribute (DOM 1) removeAttributeNS removeAttributeNode -

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
setAttributeNodeNS 1
12Returns a ClientRectList with ClientRect objects (which do not contain x and y properties) instead of DOMRect objects.
1
9Returns a ClientRectList with ClientRect objects (which do not contain x and y properties) instead of DOMRect objects.
≤12.1 1 4.4 18 4 ≤12.1 1 1.0

See also

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https://developer.mozilla.org/en-US/docs/Web/API/Element/setAttributeNodeNS