ResizeObserver: unobserve() method
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
BCD tables only load in the browser