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
ElementorSVGElementto 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
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