public interface Attr extends Node
Attrinterface represents an attribute in an
Elementobject. Typically the allowable values for the attribute are defined in a document type definition.
Attr objects inherit the
Node interface, but
since they are not actually child nodes of the element they describe, the
DOM does not consider them part of the document tree. Thus, the
nextSibling have a
null value for
Attr objects. The DOM takes the
view that attributes are properties of elements rather than having a
separate identity from the elements they are associated with; this should
make it more efficient to implement such features as default attributes
associated with all elements of a given type. Furthermore,
Attr nodes may not be immediate children of a
DocumentFragment. However, they can be associated with
Element nodes contained within a
DocumentFragment. In short, users and implementors of the
DOM need to be aware that
Attr nodes have some things in
common with other objects inheriting the
Node interface, but
they also are quite distinct.
The attribute's effective value is determined as follows: if this
attribute has been explicitly assigned any value, that value is the
attribute's effective value; otherwise, if there is a declaration for
this attribute, and that declaration includes a default value, then that
default value is the attribute's effective value; otherwise, the
attribute does not exist on this element in the structure model until it
has been explicitly added. Note that the
Attr instance can also be used to retrieve the string
version of the attribute's value(s).
In XML, where the value of an attribute can contain entity references,
the child nodes of the
Attr node may be either
EntityReference nodes (when these are
in use; see the description of
discussion). Because the DOM Core is not aware of attribute types, it
treats all attribute values as simple strings, even if the DTD or schema
declares them as having tokenized types.
See also the Document Object Model (DOM) Level 2 Core Specification.
|Modifier and Type||Method and Description|
Returns the name of this attribute.
If this attribute was explicitly given a value in the original document, this is
On retrieval, the value of the attribute is returned as a string.
appendChild, cloneNode, getAttributes, getChildNodes, getFirstChild, getLastChild, getLocalName, getNamespaceURI, getNextSibling, getNodeName, getNodeType, getNodeValue, getOwnerDocument, getParentNode, getPrefix, getPreviousSibling, hasAttributes, hasChildNodes, insertBefore, isSupported, normalize, removeChild, replaceChild, setNodeValue, setPrefix
true; otherwise, it is
false. Note that the implementation is in charge of this attribute, not the user. If the user changes the value of the attribute (even if it ends up having the same value as the default value) then the
specifiedflag is automatically flipped to
true. To re-specify the attribute as the default value from the DTD, the user must delete the attribute. The implementation will then make a new attribute available with
falseand the default value (if one exists).
true, and the value is the assigned value. If the attribute has no assigned value in the document and has a default value in the DTD, then
false, and the value is the default value in the DTD. If the attribute has no assigned value in the document and has a value of #IMPLIED in the DTD, then the attribute does not appear in the structure model of the document. If the
null(i.e. because it was just created or was set to
nullby the various removal and cloning operations)
Textnode with the unparsed contents of the string. I.e. any characters that an XML processor would recognize as markup are instead treated as literal text. See also the method
DOMException- NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
Elementnode this attribute is attached to or
nullif this attribute is not in use.