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Interface NamedNodeMap

public interfaceNamedNodeMap

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

NamedNodeMap objects in the DOM are live.

See also theDocument Object Model (DOM) Level 2 Core Specification.

getNamedItem

publicNodegetNamedItem(java.lang.String name)

Retrieves a node specified by name.

Parameters:

name - ThenodeName of a node to retrieve.

Returns:

ANode (of any type) with the specifiednodeName, ornull if it does not identify any node in this map.

setNamedItem

publicNodesetNamedItem(Node arg)                  throwsDOMException

Adds a node using itsnodeName attribute. If a node with that name is already present in this map, it is replaced by the new one.
As thenodeName 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.

Parameters:

arg - A node to store in this map. The node will later be accessible using the value of itsnodeName attribute.

Returns:

If the newNode replaces an existing node the replacedNode is returned, otherwisenull is returned.

Throws:

DOMException - WRONG_DOCUMENT_ERR: Raised ifarg 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 ifarg is anAttr that is already an attribute of anotherElement object. The DOM user must explicitly cloneAttr nodes to re-use them in other elements.
HIERARCHY_REQUEST_ERR: Raised if an attempt is made to add a node doesn't belong in this NamedNodeMap. Examples would include trying to insert something other than an Attr node into an Element's map of attributes, or a non-Entity node into the DocumentType's map of Entities.

removeNamedItem

publicNoderemoveNamedItem(java.lang.String name)                     throwsDOMException

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.

Parameters:

name - ThenodeName of the node to remove.

Returns:

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 namedname in this map.
NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.

item

publicNodeitem(int index)

Returns theindexth item in the map. Ifindex is greater than or equal to the number of nodes in this map, this returnsnull.

Parameters:

index - Index into this map.

Returns:

The node at theindexth position in the map, ornull if that is not a valid index.

getLength

public intgetLength()

The number of nodes in this map. The range of valid child node indices is0 tolength-1 inclusive.

getNamedItemNS

publicNodegetNamedItemNS(java.lang.String namespaceURI,                           java.lang.String localName)

Retrieves a node specified by local name and namespace URI.
Documents which do not support the "XML" feature will permit only the DOM Level 1 calls for creating/setting elements and attributes. Hence, if you specify a non-null namespace URI, these DOMs will never find a matching node.

Parameters:

namespaceURI - The namespace URI of the node to retrieve.

localName - The local name of the node to retrieve.

Returns:

ANode (of any type) with the specified local name and namespace URI, ornull if they do not identify any node in this map.

Since:

DOM Level 2

setNamedItemNS

publicNodesetNamedItemNS(Node arg)                    throwsDOMException

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

Parameters:

arg - A node to store in this map. The node will later be accessible using the value of itsnamespaceURI andlocalName attributes.

Returns:

If the newNode replaces an existing node the replacedNode is returned, otherwisenull is returned.

Throws:

DOMException - WRONG_DOCUMENT_ERR: Raised ifarg 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 ifarg is anAttr that is already an attribute of anotherElement object. The DOM user must explicitly cloneAttr nodes to re-use them in other elements.
HIERARCHY_REQUEST_ERR: Raised if an attempt is made to add a node doesn't belong in this NamedNodeMap. Examples would include trying to insert something other than an Attr node into an Element's map of attributes, or a non-Entity node into the DocumentType's map of Entities.
NOT_SUPPORTED_ERR: Always thrown if the current document does not support the"XML" feature, since namespaces were defined by XML.

Since:

DOM Level 2

removeNamedItemNS

publicNoderemoveNamedItemNS(java.lang.String namespaceURI,                              java.lang.String localName)                       throwsDOMException

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 theNode interface. If so, an attribute immediately appears containing the default value as well as the corresponding namespace URI, local name, and prefix when applicable.
Documents which do not support the "XML" feature will permit only the DOM Level 1 calls for creating/setting elements and attributes. Hence, if you specify a non-null namespace URI, these DOMs will never find a matching node.

Parameters:

namespaceURI - The namespace URI of the node to remove.

localName - The local name of the node to remove.

Returns:

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 specifiednamespaceURI andlocalName in this map.
NO_MODIFICATION_ALLOWED_ERR: Raised if this map is readonly.

Since:

DOM Level 2