- namespaceURI
- The namespace URI of the attribute to create or alter.
- qualifiedName
- The qualified name of the attribute to create or alter.
- value
- The value to set in string form.
Type Reason Org.W3c.Dom.DOMException INVALID_CHARACTER_ERR: Raised if the specified qualified name is not an XML name according to the XML version in use specified in the Document.xmlVersion attribute.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NAMESPACE_ERR: Raised if the qualifiedName is malformed per the Namespaces in XML specification, if the qualifiedName has a prefix and the namespaceURI is null, if the qualifiedName has a prefix that is "xml" and the namespaceURI is different from "", if the qualifiedName or its prefix is "xmlns" and the namespaceURI is different from "", or if the namespaceURI is "" and neither the qualifiedName nor its prefix is "xmlns".
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 []).
Adds a new attribute. If an attribute with the same local name and
namespace URI is already present on the element, its prefix is
changed to be the prefix part of the qualifiedName, and
its value is changed to be the value parameter. This
value is a simple string; it is not parsed as it is being set. So any
markup (such as syntax to be recognized as an entity reference) is
treated as literal text, and needs to be appropriately escaped by the
implementation when it is written out. In order to assign an
attribute value that contains entity references, the user must create
an Attr node plus any Text and
EntityReference nodes, build the appropriate subtree,
and use setAttributeNodeNS or
setAttributeNode to assign it as the value of an
attribute.
Per []
, applications must use the value null as the
namespaceURI parameter for methods if they wish to have
no namespace.