DOM: Get Element's Attribute Value

node.getAttribute(attribute_name) → Return a element's attribute value.

Attributes are things like class, id, style, width, height, etc.

If the attribute doesn't exist, returns null. (browsers before 2010 may return empty string "")

attribute_name should be a string, e.g. "style".

node is a HTML element object. [see DOM: Get Elements by ID, Tag, Name, Class, CSS Selector].

// get the value of attribute “href” in first link element
document.getElementsByTagName("a")[0].getAttribute("href");

As of 2012-04-26, this works in all major browsers.

Using Properties for Standard Attributes

For HTML elements (not XML), usually there's a corresponding property for standard attributes.

Example:

• vallue = element.id
• vallue = element.class
• vallue = link_element.href
• vallue = img_element.width

const myE = document.getElementsByTagName("a")[0];

myE.getAttribute("href");
// is equivalent to
myE.href

const xx = document.getElementById("n20652");

// example of creating a non-standard attribute
xx.setAttribute("data-user-name","John")

Class Attribute

When working with the attribute class, there are more convenient methods.

See: DOM: List/Add/Remove Class Attribute

Set Element's Attribute Value

DOM: Set Element's Attribute Value