TreeWalker: previousNode() method

{{ APIRef("DOM") }}

The TreeWalker.previousNode() method moves the current {{domxref("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 {{domxref("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

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• The {{domxref("TreeWalker")}} interface it belongs to.