The read-only invalidIteratorState property of the XPathResult interface signifies that the iterator has become invalid. It is true if XPathResult.resultType is UNORDERED_NODE_ITERATOR_TYPE or ORDERED_NODE_ITERATOR_TYPE and the document has been modified since this result was returned.
Note: This feature is available in Web Workers
A boolean value indicating whether the iterator has become invalid.
The following example shows the use of the invalidIteratorState property.
html
<div>XPath example</div>
<p>Iterator state: <output></output></p>
js
const xpath = "//div";
const result = document.evaluate(
xpath,
document,
null,
XPathResult.ANY_TYPE,
null,
);
// Invalidates the iterator state
document.querySelector("div").remove();
document.querySelector("output").textContent = result.invalidIteratorState
? "invalid"
: "valid";
| Specification |
|---|
| DOM Standard # dom-xpathresult-invaliditeratorstate |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
invalidIteratorState |
1 | 12 | 1 | No | ≤12.1 | 3 | ≤37 | 18 | 4 | ≤12.1 | 1 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/XPathResult/invalidIteratorState