How to Select All Animated Elements in jQuery

Targeting actively animating elements in jQuery is essential for managing dynamic user interfaces and preventing animation build-up. This article explains how to select running animations using jQuery's built-in :animated pseudo-selector, demonstrates practical code implementations, and covers key performance best practices.

The :animated Selector

jQuery provides a dedicated selector, :animated, specifically designed to match all elements currently undergoing a transition or animation managed by jQuery (such as .animate(), .slideDown(), or .fadeIn()).

To select every animated element on the page, use:

$(":animated")

Common Usage Examples

1. Selecting Specific Animated Elements

You can combine :animated with tag names, classes, or IDs to limit the scope of the selection:

// Select all animated <div> elements
$("div:animated");

// Select animated elements with a specific class
$(".notification:animated");

2. Stopping Active Animations

A frequent use case is halting animations that are currently in progress to prevent queue buildup caused by rapid user events:

// Stop all active animations immediately
$(":animated").stop();

// Stop animations on a specific container's children
$("#carousel").find(":animated").stop(true, true);

3. Checking If an Element Is Currently Animating

To determine if a specific element is mid-animation before triggering a new action, use the .is() method:

if ($("#menu").is(":animated")) {
    console.log("The menu animation is currently running.");
} else {
    $("#menu").slideToggle();
}

Performance Considerations

Because :animated is a custom jQuery selector rather than a standard CSS specification, browsers cannot optimize it using the native querySelectorAll API.

To maintain optimal DOM performance:

• Narrow the scope: Avoid running $(":animated") across the entire document. Instead, scope it down using a parent element, such as $("#wrapper").find(":animated").
• Use .filter(): Query standard elements first using native-friendly selectors before filtering:

$(".slider-item").filter(":animated");