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.
TreeWalker: previousNode() method
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
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
previousNode |
1 | 12 | 4 | 9 | 9 | 3 | 3 | 18 | 4 | 10.1 | 3 | 1.0 |
See also
- The
TreeWalkerinterface it belongs to.
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https://developer.mozilla.org/en-US/docs/Web/API/TreeWalker/previousNode