Programmer's Guide > Interfaces > W3C Element interface > setAttributeNode method
  
setAttributeNode method
Adds a new attribute node. If an attribute with that name ( nodeName) is already present in the element, it is replaced by the new one.
To add a new attribute node with a qualified name and namespace URI, use the setAttributeNodeNS method.
setAttributeNode(newAttr )
Parameters
AttrnewAttr
The Attr node to add to the attribute list.
Returns
Attr. If the newAttr attribute replaces an existing attribute, the replaced Attr node is returned, otherwise null is returned.
Throws
DOMException
WRONG_DOCUMENT_ERR: Raised if newAttr was created from a different document than the one that created the element.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an attribute of another Element object. The DOM user must explicitly clone Attr nodes to re-use them in other elements.