DocumentFragmentis a "lightweight" or "minimal"
Documentobject. 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
Documentobject could fulfil this role, a
Documentobject can potentially be a heavyweight object, depending on the underlying implementation. What is really needed for this is a very lightweight object.
DocumentFragmentis such an object.
Furthermore, various operations -- such as inserting nodes as children of another
Node -- may take
DocumentFragment 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 the document.
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 document.
DocumentFragment is inserted into a
Document (or indeed any other
Node that may take children) the children of the
DocumentFragment and not the
DocumentFragment itself are inserted into the
Node. This makes the
DocumentFragment very 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
Node interface, such as
Public Member Functions
|Node||appendChild (Node newChild) throws DOMException|
|Node||cloneNode (boolean deep)|
|String||getNodeValue () throws DOMException|
|Node||insertBefore (Node newChild, Node refChild) throws DOMException|
|Node||removeChild (Node oldChild) throws DOMException|
|Node||replaceChild (Node newChild, Node oldChild) throws DOMException|
|void||setNodeValue (String nodeValue) throws DOMException|
Static Public Attributes
|static final short||ATTRIBUTE_NODE = 2|
|static final short||CDATA_SECTION_NODE = 4|
|static final short||COMMENT_NODE = 8|
|static final short||DOCUMENT_FRAGMENT_NODE = 11|
|static final short||DOCUMENT_NODE = 9|
|static final short||DOCUMENT_TYPE_NODE = 10|
|static final short||ELEMENT_NODE = 1|
|static final short||ENTITY_NODE = 6|
|static final short||ENTITY_REFERENCE_NODE = 5|
|static final short||NOTATION_NODE = 12|
|static final short||PROCESSING_INSTRUCTION_NODE = 7|
|static final short||TEXT_NODE = 3|