TreeWalker: previousNode() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The TreeWalker.previousNode() method moves the current Node to the previous visible node in the document order, and returns the found node. If no such node exists, or if it is before that the root node defined at the object construction, it returns null and the current node is not changed.

Syntax

previousNode()

Parameters

None.

Return value

A Node object or null.

Examples

const treeWalker = document.createTreeWalker(
  document.body,
  NodeFilter.SHOW_ELEMENT,
  {
    acceptNode(node) {
      return NodeFilter.FILTER_ACCEPT;
    },
  },
  false,
);
const node = treeWalker.previousNode(); // returns null as there is no parent