Programmer's Guide > Interfaces > W3C NamedNodeMap interface > setNamedItem method
  
setNamedItem method
Adds a node using its nodeName attribute. If a node with that name is already present in this map, it is replaced by the new one.
As the nodeName attribute is used to derive the name which the node must be stored under, multiple nodes of certain types (those that have a "special" string value) cannot be stored as the names would clash. This is seen as preferable to allowing nodes to be aliased.
setNamedItem(arg )
Parameters
Nodearg
A node to store in this map. The node will later be accessible using the value of its nodeName attribute.
Returns
Node. If the new Node replaces an existing node the replaced Node is returned, otherwise null is returned.
Throws
DOMException
WRONG_DOCUMENT_ERR: Raised if arg was created from a different document than the one that created this map.
NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.
INUSE_ATTRIBUTE_ERR: Raised if arg is an Attr that is already an attribute of another Element object. The DOM user must explicitly clone Attr nodes to re-use them in other elements.