Node.previousSibling
The Node.previousSibling read-only property returns the node immediately preceding the specified one in its parent's childNodes list, or null if the specified node is the first in that list.
Syntax
<var>previousNode</var> = node.previousSibling;
Example
// <a><b1 id="b1"/><b2 id="b2"/></a> alert(document.getElementById("b1").previousSibling); // null alert(document.getElementById("b2").previousSibling.id); // "b1"
Notes
Gecko-based browsers insert text nodes into a document to represent whitespace in the source markup.
Therefore a node obtained, for example, using Node.firstChild or Node.previousSibling may refer to a
whitespace text node rather than the actual element the author intended to get.
See Whitespace in the DOM and W3C DOM 3 FAQ: Why are some Text nodes empty? for more information.
To navigate the opposite way through the child nodes list use Node.nextSibling.
Specification
- DOM Level 1 Core: previousSibling
- DOM Level 2 Core: previousSibling
- DOM Level 3 Core: previousSibling
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/node/previoussibling