NamedNodeMap
interface NamedNodeMap
org.w3c.dom.NamedNodeMap |
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.
NamedNodeMap
objects in the DOM are live.
See also the Document Object Model (DOM) Level 3 Core Specification.
Summary
Public methods | |
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abstract Int |
The number of nodes in this map. |
abstract Node! |
getNamedItem(name: String!) Retrieves a node specified by name. |
abstract Node! |
getNamedItemNS(namespaceURI: String!, localName: String!) Retrieves a node specified by local name and namespace URI. |
abstract Node! |
Returns the |
abstract Node! |
removeNamedItem(name: String!) Removes a node specified by name. |
abstract Node! |
removeNamedItemNS(namespaceURI: String!, localName: String!) Removes a node specified by local name and namespace URI. |
abstract Node! |
setNamedItem(arg: Node!) Adds a node using its |
abstract Node! |
setNamedItemNS(arg: Node!) Adds a node using its |
Public methods
getLength
abstract fun getLength(): Int
The number of nodes in this map. The range of valid child node indices is 0
to length-1
inclusive.
getNamedItem
abstract fun getNamedItem(name: String!): Node!
Retrieves a node specified by name.
Parameters | |
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name |
String!: The nodeName of a node to retrieve. |
Return | |
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Node! |
A Node (of any type) with the specified nodeName , or null if it does not identify any node in this map. |
getNamedItemNS
abstract fun getNamedItemNS(
namespaceURI: String!,
localName: String!
): Node!
Retrieves a node specified by local name and namespace URI.
Per [XML Namespaces] , applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.
Parameters | |
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namespaceURI |
String!: The namespace URI of the node to retrieve. |
localName |
String!: The local name of the node to retrieve. |
Return | |
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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. |
Exceptions | |
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org.w3c.dom.DOMException |
NOT_SUPPORTED_ERR: May be raised if the implementation does not support the feature "XML" and the language exposed through the Document does not support XML Namespaces (such as [HTML 4.01]). |
item
abstract fun item(index: Int): Node!
Returns the index
th item in the map. If index
is greater than or equal to the number of nodes in this map, this returns null
.
Parameters | |
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index |
Int: Index into this map. |
Return | |
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Node! |
The node at the index th position in the map, or null if that is not a valid index. |
removeNamedItem
abstract fun removeNamedItem(name: String!): Node!
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 | |
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name |
String!: The nodeName of the node to remove. |
Return | |
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Node! |
The node removed from this map if a node with such a name exists. |
Exceptions | |
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org.w3c.dom.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. |
removeNamedItemNS
abstract fun removeNamedItemNS(
namespaceURI: String!,
localName: String!
): Node!
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.
Per [XML Namespaces] , applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.
Parameters | |
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namespaceURI |
String!: The namespace URI of the node to remove. |
localName |
String!: The local name of the node to remove. |
Return | |
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Node! |
The node removed from this map if a node with such a local name and namespace URI exists. |
Exceptions | |
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org.w3c.dom.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. NOT_SUPPORTED_ERR: May be raised if the implementation does not support the feature "XML" and the language exposed through the Document does not support XML Namespaces (such as [HTML 4.01]). |
setNamedItem
abstract fun setNamedItem(arg: Node!): Node!
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. Replacing a node by itself has no effect.
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 | |
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arg |
Node!: A node to store in this map. The node will later be accessible using the value of its nodeName attribute. |
Return | |
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Node! |
If the new Node replaces an existing node the replaced Node is returned, otherwise null is returned. |
Exceptions | |
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org.w3c.dom.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. 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. |
setNamedItemNS
abstract fun setNamedItemNS(arg: Node!): Node!
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. Replacing a node by itself has no effect.
Per [XML Namespaces] , applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.
Parameters | |
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arg |
Node!: A node to store in this map. The node will later be accessible using the value of its namespaceURI and localName attributes. |
Return | |
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Node! |
If the new Node replaces an existing node the replaced Node is returned, otherwise null is returned. |
Exceptions | |
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org.w3c.dom.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. 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: May be raised if the implementation does not support the feature "XML" and the language exposed through the Document does not support XML Namespaces (such as [HTML 4.01]). |