TreeWalker: previousNode() method
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
js
previousNode()
Parameters
None.
Return value
A Node
object or null
.
Examples
js
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
Specification |
---|
DOM Standard # dom-treewalker-previousnode |
Browser compatibility
BCD tables only load in the browser
See also
- The
TreeWalker
interface it belongs to.