Attr.javaAPI DocAndroid 1.5 API6618Wed May 06 22:41:06 BST 2009org.w3c.dom


public interface Attr implements Node
The Attr interface represents an attribute in an Element object. 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 Node attributes parentNode, previousSibling, and 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 nodeValue attribute on 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 Text or EntityReference nodes (when these are in use; see the description of EntityReference for 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.

Fields Summary
Constructors Summary
Methods Summary
public java.lang.StringgetName()
Returns the name of this attribute.

the name of the attribute.

public org.w3c.dom.ElementgetOwnerElement()
The Element node this attribute is attached to or null if this attribute is not in use.

the owner Element, or null is the attribute is unused.
DOM Level 2

public booleangetSpecified()
If this attribute was explicitly given a value in the original document, this is 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 specified flag 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 specified set to false and the default value (if one exists).
In summary: If the attribute has an assigned value in the document then specified is 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 specified is 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 ownerElement attribute is null (i.e. because it was just created or was set to null by the various removal and cloning operations) specified is true.

true if the attribute was specified, false otherwise.

public java.lang.StringgetValue()
Returns the value of the attribute is returned as a string. Character and general entity references are replaced with their values. See also the method getAttribute on the Element interface.

the attribute value as a string.

public voidsetValue(java.lang.String value)
Sets the value of the attribute. This creates a Text node 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 setAttribute on the Element interface.

value the new attribute value.
DOMException NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.