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NamedNodeMap
interface are used to
represent collections of nodes that can be accessed by name. Note that
NamedNodeMap
does not inherit from NodeList
;
NamedNodeMap
s 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.
index
th item in the map.
nodeName
attribute.
public abstract Node getNamedItem(String name)
Node
(of any type) with the specified name, or
null
if the specified name did not identify any node in
the map.
public abstract Node setNamedItem(Node arg) throws DOMException
nodeName
attribute.
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.
nodeName
attribute of
the node. If a node with that name is already present in the map, it
is replaced by the new one.
Node
replaces an existing node with the
same name the previously existing Node
is returned,
otherwise null
is returned.
arg
was created from a
different document than the one that created the
NamedNodeMap
.
NamedNodeMap
is readonly.
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.
public abstract Node removeNamedItem(String name) throws DOMException
Attr
with a default value it is immediately replaced.
null
if no node
with such a name exists.
name
in
the map.
public abstract Node item(int index)
index
th item in the map. If index
is greater than or equal to the number of nodes in the map, this returns
null
.
index
th position in the
NamedNodeMap
, or null
if that is not a valid
index.
public abstract int getLength()
length-1
inclusive.
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