public interface Element extends Node
Element interface represents an element in an HTML or XML
 document. Elements may have attributes associated with them; since the
 Element interface inherits from Node, the
 generic Node interface attribute attributes may
 be used to retrieve the set of all attributes for an element. There are
 methods on the Element interface to retrieve either an
 Attr object by name or an attribute value by name. In XML,
 where an attribute value may contain entity references, an
 Attr object should be retrieved to examine the possibly
 fairly complex sub-tree representing the attribute value. On the other
 hand, in HTML, where all attributes have simple string values, methods to
 directly access an attribute value can safely be used as a convenience.
 Note: In DOM Level 2, the method normalize is
 inherited from the Node interface where it was moved.
 
See also the Document Object Model (DOM) Level 3 Core Specification.
ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_POSITION_CONTAINED_BY, DOCUMENT_POSITION_CONTAINS, DOCUMENT_POSITION_DISCONNECTED, DOCUMENT_POSITION_FOLLOWING, DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC, DOCUMENT_POSITION_PRECEDING, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE| Modifier and Type | Method and Description | 
|---|---|
| String | getAttribute(String name)Retrieves an attribute value by name. | 
| Attr | getAttributeNode(String name)Retrieves an attribute node by name. | 
| Attr | getAttributeNodeNS(String namespaceURI,
                  String localName)Retrieves an  Attrnode by local name and namespace URI. | 
| String | getAttributeNS(String namespaceURI,
              String localName)Retrieves an attribute value by local name and namespace URI. | 
| NodeList | getElementsByTagName(String name)Returns a  NodeListof all descendantElementswith a given tag name, in document order. | 
| NodeList | getElementsByTagNameNS(String namespaceURI,
                      String localName)Returns a  NodeListof all the descendantElementswith a given local name and namespace URI in
 document order. | 
| TypeInfo | getSchemaTypeInfo()The type information associated with this element. | 
| String | getTagName()The name of the element. | 
| boolean | hasAttribute(String name)Returns  truewhen an attribute with a given name is
 specified on this element or has a default value,falseotherwise. | 
| boolean | hasAttributeNS(String namespaceURI,
              String localName)Returns  truewhen an attribute with a given local name and
 namespace URI is specified on this element or has a default value,falseotherwise. | 
| void | removeAttribute(String name)Removes an attribute by name. | 
| Attr | removeAttributeNode(Attr oldAttr)Removes the specified attribute node. | 
| void | removeAttributeNS(String namespaceURI,
                 String localName)Removes an attribute by local name and namespace URI. | 
| void | setAttribute(String name,
            String value)Adds a new attribute. | 
| Attr | setAttributeNode(Attr newAttr)Adds a new attribute node. | 
| Attr | setAttributeNodeNS(Attr newAttr)Adds a new attribute. | 
| void | setAttributeNS(String namespaceURI,
              String qualifiedName,
              String value)Adds a new attribute. | 
| void | setIdAttribute(String name,
              boolean isId)If the parameter  isIdistrue, this method
 declares the specified attribute to be a user-determined ID attribute
 . | 
| void | setIdAttributeNode(Attr idAttr,
                  boolean isId)If the parameter  isIdistrue, this method
 declares the specified attribute to be a user-determined ID attribute
 . | 
| void | setIdAttributeNS(String namespaceURI,
                String localName,
                boolean isId)If the parameter  isIdistrue, this method
 declares the specified attribute to be a user-determined ID attribute
 . | 
appendChild, cloneNode, compareDocumentPosition, getAttributes, getBaseURI, getChildNodes, getFeature, getFirstChild, getLastChild, getLocalName, getNamespaceURI, getNextSibling, getNodeName, getNodeType, getNodeValue, getOwnerDocument, getParentNode, getPrefix, getPreviousSibling, getTextContent, getUserData, hasAttributes, hasChildNodes, insertBefore, isDefaultNamespace, isEqualNode, isSameNode, isSupported, lookupNamespaceURI, lookupPrefix, normalize, removeChild, replaceChild, setNodeValue, setPrefix, setTextContent, setUserDataString getTagName()
Node.localName is different
 from null, this attribute is a qualified name. For
 example, in:
 <elementExample id="demo"> ... </elementExample> ,
tagName has the value
 "elementExample". Note that this is case-preserving in
 XML, as are all of the operations of the DOM. The HTML DOM returns
 the tagName of an HTML element in the canonical
 uppercase form, regardless of the case in the source HTML document.String getAttribute(String name)
name - The name of the attribute to retrieve.Attr value as a string, or the empty string
   if that attribute does not have a specified or default value.void setAttribute(String name, String value) throws DOMException
Attr node plus any
 Text and EntityReference nodes, build the
 appropriate subtree, and use setAttributeNode to assign
 it as the value of an attribute.
 setAttributeNS method.name - The name of the attribute to create or alter.value - Value to set in string form.DOMException - INVALID_CHARACTER_ERR: Raised if the specified name is not an XML
   name according to the XML version in use specified in the
   Document.xmlVersion attribute.
   void removeAttribute(String name) throws DOMException
Document.normalizeDocument() to guarantee this
 information is up-to-date.
 removeAttributeNS method.name - The name of the attribute to remove.DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.Attr getAttributeNode(String name)
getAttributeNodeNS method.name - The name (nodeName) of the attribute to
   retrieve.Attr node with the specified name (
   nodeName) or null if there is no such
   attribute.Attr setAttributeNode(Attr newAttr) throws DOMException
nodeName) is already present in the element, it is
 replaced by the new one. Replacing an attribute node by itself has no
 effect.
 setAttributeNodeNS method.newAttr - The Attr node to add to the attribute list.newAttr attribute replaces an existing
   attribute, the replaced Attr node is returned,
   otherwise null is returned.DOMException - WRONG_DOCUMENT_ERR: Raised if newAttr was created from a
   different document than the one that created the element.
   newAttr is already an
   attribute of another Element object. The DOM user must
   explicitly clone Attr nodes to re-use them in other
   elements.Attr removeAttributeNode(Attr oldAttr) throws DOMException
Attr node is defined in the DTD, a new node
 immediately appears with the default value as well as the
 corresponding namespace URI, local name, and prefix when applicable.
 The implementation may handle default values from other schemas
 similarly but applications should use
 Document.normalizeDocument() to guarantee this
 information is up-to-date.oldAttr - The Attr node to remove from the attribute
   list.Attr node that was removed.DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   oldAttr is not an attribute
   of the element.NodeList getElementsByTagName(String name)
NodeList of all descendant Elements
 with a given tag name, in document order.name - The name of the tag to match on. The special value "*"
   matches all tags.Element nodes.String getAttributeNS(String namespaceURI, String localName) throws DOMException
null as the
 namespaceURI parameter for methods if they wish to have
 no namespace.namespaceURI - The namespace URI of the attribute to retrieve.localName - The local name of the attribute to retrieve.Attr value as a string, or the empty string
   if that attribute does not have a specified or default value.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]).void setAttributeNS(String namespaceURI, String qualifiedName, String value) throws DOMException
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.
 null as the
 namespaceURI parameter for methods if they wish to have
 no namespace.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.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.
   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 "
   http://www.w3.org/XML/1998/namespace", if the qualifiedName or its prefix is "xmlns" and the
   namespaceURI is different from "http://www.w3.org/2000/xmlns/", or if the namespaceURI is "http://www.w3.org/2000/xmlns/" and neither the qualifiedName nor its prefix is "xmlns".
   "XML" and the language exposed
   through the Document does not support XML Namespaces (such as [HTML 4.01]).void removeAttributeNS(String namespaceURI, String localName) throws DOMException
Document.normalizeDocument() to guarantee this
 information is up-to-date.
 null as the
 namespaceURI parameter for methods if they wish to have
 no namespace.namespaceURI - The namespace URI of the attribute to remove.localName - The local name of the attribute to remove.DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   "XML" and the language exposed
   through the Document does not support XML Namespaces (such as [HTML 4.01]).Attr getAttributeNodeNS(String namespaceURI, String localName) throws DOMException
Attr node by local name and namespace URI.
 null as the
 namespaceURI parameter for methods if they wish to have
 no namespace.namespaceURI - The namespace URI of the attribute to retrieve.localName - The local name of the attribute to retrieve.Attr node with the specified attribute local
   name and namespace URI or null if there is no such
   attribute.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]).Attr setAttributeNodeNS(Attr newAttr) throws DOMException
null as the
 namespaceURI parameter for methods if they wish to have
 no namespace.newAttr - The Attr node to add to the attribute list.newAttr attribute replaces an existing
   attribute with the same local name and namespace URI, the replaced
   Attr node is returned, otherwise null is
   returned.DOMException - WRONG_DOCUMENT_ERR: Raised if newAttr was created from a
   different document than the one that created the element.
   newAttr is already an
   attribute of another Element object. The DOM user must
   explicitly clone Attr nodes to re-use them in other
   elements.
   "XML" and the language exposed
   through the Document does not support XML Namespaces (such as [HTML 4.01]).NodeList getElementsByTagNameNS(String namespaceURI, String localName) throws DOMException
NodeList of all the descendant
 Elements with a given local name and namespace URI in
 document order.namespaceURI - The namespace URI of the elements to match on. The
   special value "*" matches all namespaces.localName - The local name of the elements to match on. The
   special value "*" matches all local names.NodeList object containing all the matched
   Elements.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]).boolean hasAttribute(String name)
true when an attribute with a given name is
 specified on this element or has a default value, false
 otherwise.name - The name of the attribute to look for.true if an attribute with the given name is
   specified on this element or has a default value, false
    otherwise.boolean hasAttributeNS(String namespaceURI, String localName) throws DOMException
true when an attribute with a given local name and
 namespace URI is specified on this element or has a default value,
 false otherwise.
 null as the
 namespaceURI parameter for methods if they wish to have
 no namespace.namespaceURI - The namespace URI of the attribute to look for.localName - The local name of the attribute to look for.true if an attribute with the given local name
   and namespace URI is specified or has a default value on this
   element, false otherwise.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]).TypeInfo getSchemaTypeInfo()
void setIdAttribute(String name, boolean isId) throws DOMException
isId is true, this method
 declares the specified attribute to be a user-determined ID attribute
 . This affects the value of Attr.isId and the behavior
 of Document.getElementById, but does not change any
 schema that may be in use, in particular this does not affect the
 Attr.schemaTypeInfo of the specified Attr
 node. Use the value false for the parameter
 isId to undeclare an attribute for being a
 user-determined ID attribute.
 setIdAttributeNS method.name - The name of the attribute.isId - Whether the attribute is a of type ID.DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   void setIdAttributeNS(String namespaceURI, String localName, boolean isId) throws DOMException
isId is true, this method
 declares the specified attribute to be a user-determined ID attribute
 . This affects the value of Attr.isId and the behavior
 of Document.getElementById, but does not change any
 schema that may be in use, in particular this does not affect the
 Attr.schemaTypeInfo of the specified Attr
 node. Use the value false for the parameter
 isId to undeclare an attribute for being a
 user-determined ID attribute.namespaceURI - The namespace URI of the attribute.localName - The local name of the attribute.isId - Whether the attribute is a of type ID.DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   void setIdAttributeNode(Attr idAttr, boolean isId) throws DOMException
isId is true, this method
 declares the specified attribute to be a user-determined ID attribute
 . This affects the value of Attr.isId and the behavior
 of Document.getElementById, but does not change any
 schema that may be in use, in particular this does not affect the
 Attr.schemaTypeInfo of the specified Attr
 node. Use the value false for the parameter
 isId to undeclare an attribute for being a
 user-determined ID attribute.idAttr - The attribute node.isId - Whether the attribute is a of type ID.DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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