Document: createAttributeNS() method

The Document.createAttributeNS() method creates a new attribute node with the specified namespace URI and qualified name, and returns it. The object created is a node implementing the Attr interface. The DOM does not enforce what sort of attributes can be added to a particular element in this manner.

Syntax

createAttributeNS(namespaceURI, qualifiedName)

Parameters

namespaceURI

A string that specifies the namespaceURI to associate with the attribute. Some important namespace URIs are:

HTML

http://www.w3.org/1999/xhtml

SVG

http://www.w3.org/2000/svg

MathML

http://www.w3.org/1998/Math/MathML

qualifiedName

A string that specifies the name of attribute to be created. The name property of the created attribute is initialized with the value of qualifiedName.

Return value

The new Attr node.

Exceptions

NamespaceError DOMException

Thrown if the namespaceURI value is not a valid namespace URI.

InvalidCharacterError DOMException

Thrown if the qualifiedName value is not a valid XML name; for example, it starts with a number, hyphen, or period, or contains characters other than alphanumeric characters, underscores, hyphens, or periods.

Examples

const node = document.getElementById("svg");
const a = document.createAttributeNS("http://www.w3.org/2000/svg", "viewBox");
a.value = "0 0 100 100";
node.setAttributeNode(a);
console.log(node.getAttribute("viewBox")); // "0 0 100 100"

Specifications

Browser compatibility

See also

• Document.createAttribute()
• Document.createElementNS()
• Element.setAttributeNS()
• Element.setAttributeNode()
• Element.setAttributeNodeNS()