Document: createAttributeNS() method

{{ ApiRef("DOM") }} 

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 {{domxref("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 {{DOMxRef("Attr.namespaceURI", "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 {{DOMxRef("Attr.name", "name")}}  property of the created attribute is initialized with the value of qualifiedName.

Return value

The new {{domxref("Attr")}}  node.

Exceptions

• NamespaceError {{domxref("DOMException")}} 
  • : Thrown if the namespaceURI value is not a valid namespace URI.
• InvalidCharacterError {{domxref("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

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• {{domxref("Document.createAttribute()")}} 
• {{domxref("Document.createElementNS()")}} 
• {{domxref("Element.setAttributeNS()")}} 
• {{domxref("Element.setAttributeNode()")}} 
• {{domxref("Element.setAttributeNodeNS()")}}