How to Detect CSS3 Transition Triggers: A Comprehensive Guide

Detecting CSS3 Transition Triggers: A Comprehensive Overview

In CSS3, transitions play a vital role in animating element changes. To monitor the state of a transition, you may wonder if there are events fired by an element to determine when it starts or ends.

W3C CSS Transition Draft

According to the W3C CSS Transitions Draft, the completion of a CSS Transition triggers a corresponding DOM Event. For each property undergoing transition, a specific event is fired. This event mechanism allows developers to synchronize actions with transition completion.

Webkit

Webkit browsers offer the webkitTransitionEnd event, an instance of WebKitTransitionEvent. You can set a JavaScript event listener for this event to know when a transition completes.

box.addEventListener( 'webkitTransitionEnd',
    lambda event: print("Finished transition!"), #handle transition
    False
)

Mozilla

Firefox and Opera use the transitionend and oTransitionEnd events, respectively, to signal the end of a transition. The single event fired covers all properties being changed.

Opera

Opera has only one transition event, oTransitionEnd, which occurs when a transition finishes.

Internet Explorer

Internet Explorer also provides a transitionend event triggered once a transition is complete. However, if the transition is removed before its conclusion, the event won't be dispatched.

Cross-Browser Normalization

For consistent event handling across browsers, consider using a cross-browser library like Modernizr or jQuery. These libraries provide normalized event bindings for various CSS3 properties, including transitions.

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