Animation: commitStyles() method
The commitStyles()
method of the Web Animations API's Animation
interface writes the computed values of the animation's current styles into its target element's style
attribute. commitStyles()
works even if the animation has been automatically removed.
commitStyles()
can be used in combination with fill
to cause the final state of an animation to persist after the animation ends. The same effect could be achieved with fill
alone, but using indefinitely filling animations is discouraged. Animations take precedence over all static styles, so an indefinite filling animation can prevent the target element from ever being styled normally.
Using commitStyles()
writes the styling state into the element's style
attribute, where they can be modified and replaced as normal.
Syntax
js
commitStyles()
Parameters
None.
Return value
None (undefined
).
Examples
Committing the final state of an animation
In this example we have two buttons, labeled "Commit styles" and "Fill forwards". Both buttons animate when you click them, and both buttons persist the final state of the animation.
The difference, though, is that "Fill forwards" only uses fill: "forwards"
to persist the animation's final state: this means that the browser has to maintain the animation's state indefinitely, or until it can be automatically removed.
However, the "Commit styles" button waits for the animation to finish, then calls commitStyles()
, then cancels the animation, so the finished style is captured as the value of the style
attribute, rather than as the animation state.
HTML
html
<button class="commit-styles">Commit styles</button>
<br />
<button class="fill-forwards">Fill forwards</button>
JavaScript
js
const commitStyles = document.querySelector(".commit-styles");
let offset1 = 0;
commitStyles.addEventListener("click", async (event) => {
// Start the animation
offset1 = 100 - offset1;
const animation = commitStyles.animate(
{ transform: `translate(${offset1}px)` },
{ duration: 500, fill: "forwards" }
);
// Wait for the animation to finish
await animation.finished;
// Commit animation state to style attribute
animation.commitStyles();
// Cancel the animation
animation.cancel();
});
const fillForwards = document.querySelector(".fill-forwards");
let offset2 = 0;
fillForwards.addEventListener("click", async (event) => {
// Start the animation
offset2 = 100 - offset2;
const animation = fillForwards.animate(
{ transform: `translate(${offset2}px)` },
{ duration: 500, fill: "forwards" }
);
});
Result
Specifications
Specification |
---|
Web Animations # dom-animation-commitstyles |
Browser compatibility
BCD tables only load in the browser
See also
- Web Animations API
Animation
for other methods and properties you can use to control web page animation.