org.w3c.dom.DocumentFragment |
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
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.
When a
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
Node.insertBefore
and
Node.appendChild
.
See also the Document Object Model (DOM) Level 3 Core Specification .
[Expand]
Inherited Constants
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
From interface
org.w3c.dom.Node
|
[Expand]
Inherited Methods
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
From interface
org.w3c.dom.Node
|