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Element

public interface Element
implements Node

org.w3c.dom.Element


The 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.

Summary

Inherited constants

From interface org.w3c.dom.Node

Public methods

abstract String getAttribute(String name)

Retrieves an attribute value by name.

abstract String getAttributeNS(String namespaceURI, String localName)

Retrieves an attribute value by local name and namespace URI.

abstract Attr getAttributeNode(String name)

Retrieves an attribute node by name.

abstract Attr getAttributeNodeNS(String namespaceURI, String localName)

Retrieves an Attr node by local name and namespace URI.

abstract NodeList getElementsByTagName(String name)

Returns a NodeList of all descendant Elements with a given tag name, in document order.

abstract NodeList getElementsByTagNameNS(String namespaceURI, String localName)

Returns a NodeList of all the descendant Elements with a given local name and namespace URI in document order.

abstract TypeInfo getSchemaTypeInfo()

The type information associated with this element.

abstract String getTagName()

The name of the element.

abstract boolean hasAttribute(String name)

Returns true when an attribute with a given name is specified on this element or has a default value, false otherwise.

abstract boolean hasAttributeNS(String namespaceURI, String localName)

Returns true when an attribute with a given local name and namespace URI is specified on this element or has a default value, false otherwise.

abstract void removeAttribute(String name)

Removes an attribute by name.

abstract void removeAttributeNS(String namespaceURI, String localName)

Removes an attribute by local name and namespace URI.

abstract Attr removeAttributeNode(Attr oldAttr)

Removes the specified attribute node.

abstract void setAttribute(String name, String value)

Adds a new attribute.

abstract void setAttributeNS(String namespaceURI, String qualifiedName, String value)

Adds a new attribute.

abstract Attr setAttributeNode(Attr newAttr)

Adds a new attribute node.

abstract Attr setAttributeNodeNS(Attr newAttr)

Adds a new attribute.

abstract void setIdAttribute(String name, boolean isId)

If the parameter isId is true, this method declares the specified attribute to be a user-determined ID attribute .

abstract void setIdAttributeNS(String namespaceURI, String localName, boolean isId)

If the parameter isId is true, this method declares the specified attribute to be a user-determined ID attribute .

abstract void setIdAttributeNode(Attr idAttr, boolean isId)

If the parameter isId is true, this method declares the specified attribute to be a user-determined ID attribute .

Inherited methods

From interface org.w3c.dom.Node

Public methods

getAttribute

Added in API level 1
String getAttribute (String name)

Retrieves an attribute value by name.

Parameters
name String: The name of the attribute to retrieve.
Returns
String The Attr value as a string, or the empty string if that attribute does not have a specified or default value.

getAttributeNS

Added in API level 1
String getAttributeNS (String namespaceURI, 
                String localName)

Retrieves an attribute value 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
namespaceURI String: The namespace URI of the attribute to retrieve.
localName String: The local name of the attribute to retrieve.
Returns
String The Attr value as a string, or the empty string if that attribute does not have a specified or default value.
Throws
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]).

getAttributeNode

Added in API level 1
Attr getAttributeNode (String name)

Retrieves an attribute node by name.
To retrieve an attribute node by qualified name and namespace URI, use the getAttributeNodeNS method.

Parameters
name String: The name (nodeName) of the attribute to retrieve.
Returns
Attr The Attr node with the specified name ( nodeName) or null if there is no such attribute.

getAttributeNodeNS

Added in API level 1
Attr getAttributeNodeNS (String namespaceURI, 
                String localName)

Retrieves an Attr node 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
namespaceURI String: The namespace URI of the attribute to retrieve.
localName String: The local name of the attribute to retrieve.
Returns
Attr The Attr node with the specified attribute local name and namespace URI or null if there is no such attribute.
Throws
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]).

getElementsByTagName

Added in API level 1
NodeList getElementsByTagName (String name)

Returns a NodeList of all descendant Elements with a given tag name, in document order.

Parameters
name String: The name of the tag to match on. The special value "*" matches all tags.
Returns
NodeList A list of matching Element nodes.

getElementsByTagNameNS

Added in API level 1
NodeList getElementsByTagNameNS (String namespaceURI, 
                String localName)

Returns a NodeList of all the descendant Elements with a given local name and namespace URI in document order.

Parameters
namespaceURI String: The namespace URI of the elements to match on. The special value "*" matches all namespaces.
localName String: The local name of the elements to match on. The special value "*" matches all local names.
Returns
NodeList A new NodeList object containing all the matched Elements.
Throws
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]).

getSchemaTypeInfo

Added in API level 8
TypeInfo getSchemaTypeInfo ()

The type information associated with this element.

Returns
TypeInfo

getTagName

Added in API level 1
String getTagName ()

The name of the element. If 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.

Returns
String

hasAttribute

Added in API level 1
boolean hasAttribute (String name)

Returns true when an attribute with a given name is specified on this element or has a default value, false otherwise.

Parameters
name String: The name of the attribute to look for.
Returns
boolean true if an attribute with the given name is specified on this element or has a default value, false otherwise.

hasAttributeNS

Added in API level 1
boolean hasAttributeNS (String namespaceURI, 
                String localName)

Returns true when an attribute with a given local name and namespace URI is specified on this element or has a default value, false otherwise.
Per [XML Namespaces] , applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.

Parameters
namespaceURI String: The namespace URI of the attribute to look for.
localName String: The local name of the attribute to look for.
Returns
boolean true if an attribute with the given local name and namespace URI is specified or has a default value on this element, false otherwise.
Throws
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]).

removeAttribute

Added in API level 1
void removeAttribute (String name)

Removes an attribute by name. If a default value for the removed attribute is defined in the DTD, a new attribute 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.
If no attribute with this name is found, this method has no effect.
To remove an attribute by local name and namespace URI, use the removeAttributeNS method.

Parameters
name String: The name of the attribute to remove.
Throws
DOMException NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

removeAttributeNS

Added in API level 1
void removeAttributeNS (String namespaceURI, 
                String localName)

Removes an attribute by local name and namespace URI. If a default value for the removed attribute is defined in the DTD, a new attribute 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.
If no attribute with this local name and namespace URI is found, this method 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
namespaceURI String: The namespace URI of the attribute to remove.
localName String: The local name of the attribute to remove.
Throws
DOMException NO_MODIFICATION_ALLOWED_ERR: Raised if this node 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]).

removeAttributeNode

Added in API level 1
Attr removeAttributeNode (Attr oldAttr)

Removes the specified attribute node. If a default value for the removed 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.

Parameters
oldAttr Attr: The Attr node to remove from the attribute list.
Returns
Attr The Attr node that was removed.
Throws
DOMException NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if oldAttr is not an attribute of the element.

setAttribute

Added in API level 1
void setAttribute (String name, 
                String value)

Adds a new attribute. If an attribute with that name is already present in the element, its value is changed to be that of 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 setAttributeNode to assign it as the value of an attribute.
To set an attribute with a qualified name and namespace URI, use the setAttributeNS method.

Parameters
name String: The name of the attribute to create or alter.
value String: Value to set in string form.
Throws
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.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

setAttributeNS

Added in API level 1
void setAttributeNS (String namespaceURI, 
                String qualifiedName, 
                String value)

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 [XML Namespaces] , applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.

Parameters
namespaceURI String: The namespace URI of the attribute to create or alter.
qualifiedName String: The qualified name of the attribute to create or alter.
value String: The value to set in string form.
Throws
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 " 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".
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]).

setAttributeNode

Added in API level 1
Attr setAttributeNode (Attr newAttr)

Adds a new attribute node. If an attribute with that name ( nodeName) is already present in the element, it is replaced by the new one. Replacing an attribute node by itself has no effect.
To add a new attribute node with a qualified name and namespace URI, use the setAttributeNodeNS method.

Parameters
newAttr Attr: The Attr node to add to the attribute list.
Returns
Attr If the newAttr attribute replaces an existing attribute, the replaced Attr node is returned, otherwise null is returned.
Throws
DOMException WRONG_DOCUMENT_ERR: Raised if newAttr was created from a different document than the one that created the element.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an attribute of another Element object. The DOM user must explicitly clone Attr nodes to re-use them in other elements.

setAttributeNodeNS

Added in API level 1
Attr setAttributeNodeNS (Attr newAttr)

Adds a new attribute. If an attribute with that local name and that namespace URI is already present in the element, it is replaced by the new one. Replacing an attribute 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
newAttr Attr: The Attr node to add to the attribute list.
Returns
Attr If the newAttr attribute replaces an existing attribute with the same local name and namespace URI, the replaced Attr node is returned, otherwise null is returned.
Throws
DOMException WRONG_DOCUMENT_ERR: Raised if newAttr was created from a different document than the one that created the element.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an attribute of another Element object. The DOM user must explicitly clone Attr nodes to re-use them in other elements.
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]).

setIdAttribute

Added in API level 8
void setIdAttribute (String name, 
                boolean isId)

If the parameter 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.
To specify an attribute by local name and namespace URI, use the setIdAttributeNS method.

Parameters
name String: The name of the attribute.
isId boolean: Whether the attribute is a of type ID.
Throws
DOMException NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if the specified node is not an attribute of this element.

setIdAttributeNS

Added in API level 8
void setIdAttributeNS (String namespaceURI, 
                String localName, 
                boolean isId)

If the parameter 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.

Parameters
namespaceURI String: The namespace URI of the attribute.
localName String: The local name of the attribute.
isId boolean: Whether the attribute is a of type ID.
Throws
DOMException NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if the specified node is not an attribute of this element.

setIdAttributeNode

Added in API level 8
void setIdAttributeNode (Attr idAttr, 
                boolean isId)

If the parameter 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.

Parameters
idAttr Attr: The attribute node.
isId boolean: Whether the attribute is a of type ID.
Throws
DOMException NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if the specified node is not an attribute of this element.
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