NamedNodeMap interface

Objects implementing the NamedNodeMap interface are used to represent collections of nodes that can be accessed by name. Note that NamedNodeMap does not inherit from NodeList; NamedNodeMaps are not maintained in any particular order. Objects contained in an object implementing NamedNodeMap may also be accessed by an ordinal index, but this is simply to allow convenient enumeration of the contents of a NamedNodeMap, and does not imply that the DOM specifies an order to these Nodes.

length
Access	read-only
Returns	unsigned long

getNamedItemname
Parameters	Stringname The nodeName of a node to retrieve.
Returns	Node. A Node (of any type) with the specified nodeName, or null if it does not identify any node in this map.

getNamedItemNSnamespaceURIlocalName
Parameters	StringnamespaceURI The namespace URI of the node to retrieve. StringlocalName The local name of the node to retrieve.
Returns	Node. A Node (of any type) with the specified local name and namespace URI, or null if they do not identify any node in this map.

itemnodeindex
Parameters	unsigned longnodeindex Index into this map.
Returns	Node. The node at the indexth position in the map, or null if that is not a valid index.

namedItemname
Parameters	Stringname The nodeName of a node to retrieve.
Returns	Node. A Node (of any type) with the specified nodeName, or null if it does not identify any node in this map.

Removes a node specified by name. When this map contains the attributes attached to an element, if the removed attribute is known to have a default value, an attribute immediately appears containing the default value as well as the corresponding namespace URI, local name, and prefix when applicable.

removeNamedItemname
Parameters	Stringname The nodeName of the node to remove.
Returns	Node. The node removed from this map if a node with such a name exists.
Throws	DOMException NOT_FOUND_ERR: Raised if there is no node named name in this map. NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.

Removes a node specified by local name and namespace URI. A removed attribute may be known to have a default value when this map contains the attributes attached to an element, as returned by the attributes attribute of the Node interface. If so, an attribute immediately appears containing the default value as well as the corresponding namespace URI, local name, and prefix when applicable.

removeNamedItemNSnamespaceURIlocalName
Parameters	StringnamespaceURI The namespace URI of the node to remove. StringlocalName The local name of the node to remove.
Returns	Node. The node removed from this map if a node with such a local name and namespace URI exists.
Throws	DOMException NOT_FOUND_ERR: Raised if there is no node with the specified namespaceURI and localName in this map. NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.

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.

setNamedItemarg
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.

Adds a node using its namespaceURI and localName. If a node with that namespace URI and that local name is already present in this map, it is replaced by the new one.

setNamedItemNSarg
Parameters	Nodearg A node to store in this map. The node will later be accessible using the value of its namespaceURI and localName attributes.
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.