How Can I Reliably Disable CSS Transitions in JavaScript?

Overcoming the Challenges of CSS Transitions

In the realm of web development, temporarily disabling CSS transition effects can present a challenge. While it may seem straightforward to simply toggle a CSS class, this approach often falls short due to browser optimization.

The Solution: A No-Transition Class and Forced Reflow

To effectively disable transitions, a CSS class can be employed to set all transition properties to none using the !important flag. However, this classだけでは、期待した動作は得られません。

.notransition {
  -webkit-transition: none !important;
  -moz-transition: none !important;
  -o-transition: none !important;
  transition: none !important;
}

The trick lies in forcing a reflow of the element after modifying its CSS properties. This refresh flushes the pending CSS changes, ensuring that the transition is disabled. One reliable method is by accessing the offsetHeight property of the element.

JavaScript Implementation

Without jQuery:

someElement.classList.add('notransition'); // Disable transitions
doWhateverCssChangesYouWant(someElement);
someElement.offsetHeight; // Trigger a reflow, flushing the CSS changes
someElement.classList.remove('notransition'); // Re-enable transitions

With jQuery:

$someElement.addClass('notransition'); // Disable transitions
doWhateverCssChangesYouWant($someElement);
$someElement[0].offsetHeight; // Trigger a reflow, flushing the CSS changes
$someElement.removeClass('notransition'); // Re-enable transitions

Caveats

Ensure that !important is sufficient to override existing styles. If not, consider using element.style.setProperty to disable and re-enable transitions manually. Vendor prefixes may be omitted, as most modern browsers support transitions without them.

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