ResizeObserver.unobserve()

The unobserve() method of the ResizeObserver interface ends the observing of a specified Element or SVGElement.

Syntax

unobserve(target)

Parameters

target

A reference to an Element or SVGElement to be unobserved.

Return value

None (undefined).

Exceptions

None.

Examples

The following snippet is taken from the resize-observer-text.html (see source) example:

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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