Skip to Main Content
JavaScript: The Definitive Guide, Fourth Edition
book

JavaScript: The Definitive Guide, Fourth Edition

by David Flanagan
November 2001
Intermediate to advanced content levelIntermediate to advanced
936 pages
68h 43m
English
O'Reilly Media, Inc.
Content preview from JavaScript: The Definitive Guide, Fourth Edition

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( ).

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

JavaScript: A Beginner's Guide, Fourth Edition, 4th Edition

JavaScript: A Beginner's Guide, Fourth Edition, 4th Edition

John Pollock
Coding with JavaScript For Dummies

Coding with JavaScript For Dummies

Chris Minnick, Eva Holland

Publisher Resources

ISBN: 0596000480Supplemental ContentCatalog PageErrata