NodeIterator: 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 NodeIterator.previousNode() method returns the
previous node in the set represented by the NodeIterator and moves the
position of the iterator backwards within the set.
This method returns null when the current node is the first node in the
set.
In old browsers, as specified in old versions of the specifications, the method may
throws the INVALID_STATE_ERR DOMException if this method
is called after the NodeIterator.detach() method. Recent browsers never
throw.
Syntax
previousNode()
Parameters
None.
Return value
A Node representing the node before the current node in the set represented by this NodeIterator, or null if the current node is the first node in the set.
Examples
const nodeIterator = document.createNodeIterator(
document.body,
NodeFilter.SHOW_ELEMENT,
{
acceptNode(node) {
return NodeFilter.FILTER_ACCEPT;
},
},
);
currentNode = nodeIterator.nextNode(); // returns the next node
previousNode = nodeIterator.previousNode(); // same result, since we backtracked to the previous node
Specifications
| Specification |
|---|
| DOM # dom-nodeiterator-previousnode |
Browser compatibility
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previousNode
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Legend
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- Full support
- Full support
See also
- The interface it belongs to:
NodeIterator.