ResizeObserver: unobserve() 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 2020.
The unobserve()
method of the
ResizeObserver
interface ends the observing of a specified
Element
or SVGElement
.
Syntax
js
unobserve(target)
Parameters
target
-
A reference to an
Element
orSVGElement
to be unobserved.
Return value
None (undefined
).
Exceptions
None.
Examples
The following snippet is taken from the resize-observer-text.html (see source) example:
js
const resizeObserver = new ResizeObserver((entries) => {
for (const entry of entries) {
if (entry.contentBoxSize) {
// Checking for chrome as using a non-standard array
if (entry.contentBoxSize[0]) {
h1Elem.style.fontSize = `${Math.max(
1.5,
entry.contentBoxSize[0].inlineSize / 200,
)}rem`;
pElem.style.fontSize = `${Math.max(
1,
entry.contentBoxSize[0].inlineSize / 600,
)}rem`;
} else {
h1Elem.style.fontSize = `${Math.max(
1.5,
entry.contentBoxSize.inlineSize / 200,
)}rem`;
pElem.style.fontSize = `${Math.max(
1,
entry.contentBoxSize.inlineSize / 600,
)}rem`;
}
} else {
h1Elem.style.fontSize = `${Math.max(
1.5,
entry.contentRect.width / 200,
)}rem`;
pElem.style.fontSize = `${Math.max(1, entry.contentRect.width / 600)}rem`;
}
}
console.log("Size changed");
});
resizeObserver.observe(divElem);
checkbox.addEventListener("change", () => {
if (checkbox.checked) {
resizeObserver.observe(divElem);
} else {
resizeObserver.unobserve(divElem);
}
});
Specifications
Specification |
---|
Resize Observer # dom-resizeobserver-unobserve |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
unobserve |
Legend
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- Full support
- Full support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.