GlobalEventHandlers.ontransitionend
The ontransitionend
property of the
GlobalEventHandlers
mixin is an event handler that
processes transitionend
events.
The transitionend
event is sent to when a CSS transition completes.
Note: If the transition is removed from its target node before the transition completes
execution, the transitionend
event won't be generated. One way this can
happen is by changing the value of the transition-property
attribute
which applies to the target. Another is if the display
attribute is set
to none
.
Syntax
var transitionEndHandler = target.ontransitionend;
target.ontransitionend = Function
Value
A Function
to be called when a transitionend
event occurs
indicating that a CSS transition has completed on the target
,
where the target object is an HTML element (HTMLElement
), document
(Document
), or window (Window
). The function receives as
input a single parameter: a TransitionEvent
object describing the event
which occurred; the event's TransitionEvent.elapsedTime
property's value
should be the same as the value of transition-duration
.
Note: elapsedTime
does not include time prior to the transition effect
beginning; that means that the value of transition-delay
doesn't affect
the value of elapsedTime
, which is zero until the delay period ends and
the animation begins.
Example
In this example, we use the transitionrun
and transitionend
events to detect when the transition begins and ends, to cause a text update to occur
during the transition. This could also be used to trigger animations or other effects,
to allow chaining of reactions.
HTML
This creates a <div>
which we'll style with CSS below to make into a
box that resizes and changes color and such.
<div class="box"></div>
CSS
The CSS below styles the box and applies a transition effect which makes the box's color and size change, and causes the box to rotate, while the mouse cursor hovers over it.
.box {
margin-left: 70px;
margin-top: 30px;
border-style: solid;
border-width: 1px;
display: block;
width: 100px;
height: 100px;
background-color: #0000FF;
color: #FFFFFF;
padding: 20px;
font: bold 1.6em "Helvetica", "Arial", sans-serif;
transition: width 2s, height 2s, background-color 2s, transform 2s, color 2s;
}
.box:hover {
background-color: #FFCCCC;
color: #000000;
width: 200px;
height: 200px;
transform: rotate(180deg);
}
JavaScript
Next, we need to establish our event handlers to change the text content of the box when the transition begins and ends.
let box = document.querySelector(".box");
box.ontransitionrun = function(event) {
box.textContent = "Zooming...";
}
box.ontransitionend = function(event) {
box.textContent = "Done!";
}
Result
The resulting content looks like this:
Notice what happens when you hover your mouse cursor over the box, then move it away.
Specifications
Specification |
---|
CSS Transitions Level 2 # ref-for-dom-globaleventhandlers-ontransitionend |
Browser compatibility
BCD tables only load in the browser
See also
- The
transitionend
event this event handler is triggered by TransitionEvent
- The
transitionrun
event, which occurs when the transition begins