DocumentFragment is a "lightweight" or "minimal"
Document object. It is very common to want to be able to
extract a portion of a document's tree or to create a new fragment of a
document. Imagine implementing a user command like cut or rearranging a
document by moving fragments around. It is desirable to have an object
which can hold such fragments and it is quite natural to use a Node for
this purpose. While it is true that a
Document object could
fulfill this role, a
Document object can potentially be a
heavyweight object, depending on the underlying implementation. What is
really needed for this is a very lightweight object.
DocumentFragment is such an object.
Furthermore, various operations -- such as inserting nodes as children
Node -- may take
objects as arguments; this results in all the child nodes of the
DocumentFragment being moved to the child list of this node.
The children of a
DocumentFragment node are zero or more
nodes representing the tops of any sub-trees defining the structure of
DocumentFragment nodes do not need to be
well-formed XML documents (although they do need to follow the rules
imposed upon well-formed XML parsed entities, which can have multiple top
nodes). For example, a
DocumentFragment might have only one
child and that child node could be a
Text node. Such a
structure model represents neither an HTML document nor a well-formed XML
DocumentFragment is inserted into a
Document (or indeed any other
Node that may
take children) the children of the
DocumentFragment and not
DocumentFragment itself are inserted into the
Node. This makes the
useful when the user wishes to create nodes that are siblings; the
DocumentFragment acts as the parent of these nodes so that
the user can use the standard methods from the
interface, such as
See also the Document Object Model (DOM) Level 3 Core Specification.
Inherited Constant Summary
|short||ATTRIBUTE_NODE||The node is an
|short||CDATA_SECTION_NODE||The node is a
|short||COMMENT_NODE||The node is a
|short||DOCUMENT_FRAGMENT_NODE||The node is a
|short||DOCUMENT_NODE||The node is a
|short||DOCUMENT_POSITION_CONTAINED_BY||The node is contained by the reference node.|
|short||DOCUMENT_POSITION_CONTAINS||The node contains the reference node.|
|short||DOCUMENT_POSITION_DISCONNECTED||The two nodes are disconnected.|
|short||DOCUMENT_POSITION_FOLLOWING||The node follows the reference node.|
|short||DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC||The determination of preceding versus following is implementation-specific.|
|short||DOCUMENT_POSITION_PRECEDING||The second node precedes the reference node.|
|short||DOCUMENT_TYPE_NODE||The node is a
|short||ELEMENT_NODE||The node is an
|short||ENTITY_NODE||The node is an
|short||ENTITY_REFERENCE_NODE||The node is an
|short||NOTATION_NODE||The node is a
|short||PROCESSING_INSTRUCTION_NODE||The node is a
|short||TEXT_NODE||The node is a
Inherited Method Summary
Returns a duplicate of this node, i.e., serves as a generic copy constructor for nodes.
The absolute base URI of this node or
The first child of this node.
The last child of this node.
Returns the local part of the qualified name of this node.
The namespace URI of this node, or
The node immediately following this node.
The name of this node, depending on its type; see the table above.
A code representing the type of the underlying object, as defined above.
The value of this node, depending on its type; see the table above.
The parent of this node.
The namespace prefix of this node, or
The node immediately preceding this node.
This attribute returns the text content of this node and its descendants.
Returns whether this node (if it is an element) has any attributes.
Returns whether this node has any children.