How to Temporarily Disable CSS Transitions During DOM Manipulation?

How to Temporarily Disable CSS Transition Effects

When working with DOM elements that have CSS transitions applied, there may be situations where you need to temporarily disable these effects for smooth resizing. This article explores the most elegant solution to achieve this.

Disabling Transitions

To disable CSS transitions effectively, you can create a "notransition" class like this:

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

Implementing with JavaScript

There are two ways to apply the "notransition" class with JavaScript:

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

Explanation

The problem with disabling transitions is that browsers buffer styling changes until JavaScript execution finishes and apply them in a single "reflow." This can result in unwanted animations. To force a reflow and flush the CSS changes, you need to read the element's offsetHeight property.

Additional Notes

• Ensure that '!important' has enough weight to override existing styles.
• Consider vendor-prefixed properties for browser compatibility.
• This solution is suitable for browsers that support transitions but remember that not all browsers do.

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