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Summary
Returns the specified attribute of the specified element, as an Attr node.
Syntax
var attrNode = element.getAttributeNode(attrName);
attrNodeis anAttrnode for the attribute.attrNameis a string containing the name of the attribute.
Example
// html: <div id="top" />
var t = document.getElementById("top");
var idAttr = t.getAttributeNode("id");
alert(idAttr.value == "top")
Notes
When called on an HTML element in a DOM flagged as an HTML document, getAttributeNode lower-cases its argument before proceeding.
The Attr node inherits from Node, but is not considered a part of the document tree. Common Node attributes like parentNode, previousSibling, and nextSibling are null for an Attr node. You can, however, get the element to which the attribute belongs with the ownerElement property.
getAttribute is usually used instead of getAttributeNode to get the value of an element's attribute.
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 |
- |