Document: createAttribute() method

The createAttribute() method of the Document interface creates a new attribute node.

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.

Note: The string given in parameter is converted to lowercase.

Syntax

createAttribute(localName)

Parameters

localName: A string containing the name of the attribute. The value is used to initialize the new attribute's localName property.

Return value

An Attr node.

Exceptions

InvalidCharacterError DOMException: Thrown if the localName value is not a valid attribute name. It must have at least one character, and may not contain ASCII whitespace, NULL, /, = or > (U+0000, U+002F, U+003D, or U+003E, respectively).

Note: Earlier versions of the specification were more restrictive, requiring that the localName be a valid XML name.

Examples

Basic example

const node = document.getElementById("div1");
const a = document.createAttribute("my_attrib");
a.value = "newVal";
node.setAttributeNode(a);
console.log(node.getAttribute("my_attrib")); // "newVal"