All objects in a DOM document tree (including
Document object itself) implement the
Node interface, which provides basic methods for
traversing and manipulating the tree.
getParentNode( ) and
) allow you to traverse up and down the document tree. You
can enumerate the children of a given node by looping through the
elements of the
NodeList returned by
getChildNodes( ), or by using
getFirstChild( ) and
getLastChild( ) and
getPreviousSibling( ) to loop backwards). It is
sometimes useful to call
hasChildNodes( ) to
determine whether a node has children or not.
getOwnerDocument( ) returns the
Document node of which the node is a descendant or
with which it is associated. It provides a quick way to jump to the
root of the document tree.
Several methods allow you to add children to a tree or alter the list
appendChild( ) adds a new child node
at the end of this nodes list of children.
) inserts a node into this nodes list of children, placing
it immediately before a specified child node.
) removes the specified node from this
node’s list of children.
) replaces one child node of this node with another node.
For all of these methods, if the node to be appended or inserted is
already part of the document tree, it is first removed from its
current parent. Use
cloneNode( ) to produce a copy
of this node. Pass
true if you want all
descendants of this node to be cloned as well.
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