Name
TreeWalker.previousNode( ) — return the previous node that is not filtered out
Availability
DOM Level 2 Traversal
Synopsis
Node previousNode( );
Returns
The nearest node that precedes the current node in the document
source and is not filtered out, or null
if there
is none.
Description
This method sets currentNode
to the previous node
(in document source order) that is not filtered out and returns that
node. If there is no such node, or if the search for the previous
node takes the TreeWalker outside of the root
subtree, currentNode
remains unchanged and the
method returns null
.
Note that this method “flattens” the document tree
structure and returns nodes in the order in which they appear in the
document source. Calling previousNode( )
may cause
the current node to move down, sideways, or up the document tree.
This type of flattening traversal can also be performed with
NodeIterator.previousNode( )
.
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