NAME¶
XML::DOM::NamedNodeMap - A hash table interface for XML::DOM
DESCRIPTION¶
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.
Note that in this implementation, the objects added to a NamedNodeMap are kept
in order.
METHODS
- getNamedItem (name)
- Retrieves a node specified by name.
Return Value: A Node (of any type) with the specified name, or undef if the
specified name did not identify any node in the map.
- setNamedItem (arg)
- Adds a node using its nodeName attribute.
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.
Parameters:
arg A node to store in a named node map.
The node will later be accessible using the value of the nodeName attribute
of the node. If a node with that name is already present in the map, it is
replaced by the new one.
Return Value: If the new Node replaces an existing node with the same name
the previously existing Node is returned, otherwise undef is returned.
DOMExceptions:
- * WRONG_DOCUMENT_ERR
- Raised if arg was created from a different document than the one that
created the NamedNodeMap.
- * NO_MODIFICATION_ALLOWED_ERR
- Raised if this NamedNodeMap 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.
- removeNamedItem (name)
- Removes a node specified by name. If the removed node is an Attr with a
default value it is immediately replaced.
Return Value: The node removed from the map or undef if no node with such a
name exists.
DOMException:
- * NOT_FOUND_ERR
- Raised if there is no node named name in the map.
- item (index)
- Returns the indexth item in the map. If index is greater than or equal to
the number of nodes in the map, this returns undef.
Return Value: The node at the indexth position in the NamedNodeMap, or undef
if that is not a valid index.
- getLength
- Returns the number of nodes in the map. The range of valid child node
indices is 0 to length-1 inclusive.
Additional methods not in the DOM Spec
- getValues
- Returns a NodeList with the nodes contained in the NamedNodeMap. The
NodeList is "live", in that it reflects changes made to the
NamedNodeMap.
When this method is called in a list context, it returns a regular perl list
containing the values. Note that this list is not "live". E.g.
@list = $map->getValues; # returns a perl list
$nodelist = $map->getValues; # returns a NodeList (object ref.)
for my $val ($map->getValues) # iterate over the values
- getChildIndex (node)
- Returns the index of the node in the NodeList as returned by getValues, or
-1 if the node is not in the NamedNodeMap.
- dispose
- Removes all circular references in this NamedNodeMap and its descendants
so the objects can be claimed for garbage collection. The objects should
not be used afterwards.