To control CSS animations not to automatically play when the page is loaded, there are three methods to do so. 1. Use animation-play-state: paused to pause the animation, and then use JavaScript to start with .style.animationPlayState = 'running'; 2. Set a huge animation-delay value (such as 9999s) to delay playback, and use JS to set it to 0 seconds when needed; 3. No animation classes are added initially, and dynamically add an animation class through JS to control the playback timing.
Sometimes you may not want CSS animations to play automatically when the page is loaded, such as using JavaScript to control the triggering timing of the animation. To achieve this effect, there are actually several simple and effective methods.
1. Use animation-play-state attribute
This is the most direct way. You can define the animation first, but pause it by setting animation-play-state: paused; and then start it in JavaScript when needed.
.my-element {
animation: spin 2s linear infinite;
animation-play-state: paused;
}When a user clicks a button or other event occurs, use JS to change the state:
document.querySelector('.my-element').style.animationPlayState = 'running';
The advantage of this approach is that it is flexible in control and is suitable for animations that require interactive triggering.
2. Delay animation start time: animation-delay
If you just want the animation to "wait for a while" after the page is loaded, you can use animation-delay to set a large delay value (such as tens of thousands of seconds), which is equivalent to not allowing it to move at the beginning.
.my-element {
animation: fadeIn 1s ease-in;
animation-delay: 9999s;
}Then, you can set delay to 0 in JS and trigger the animation:
const el = document.querySelector('.my-element'); el.style.animationDelay = '0s';
This method is suitable for scenes where you don't want to pause completely but don't want to play as soon as you come up.
3. Dynamically add animation class names
Another idea is: not to apply an animation class in the initial HTML, but to add it when needed.
HTML:
<div id="box"></div> <button onclick="startAnimation()">Play animation</button>
CSS:
#box {
width: 100px;
height: 100px;
background: red;
}
.animate {
animation: bounce 1s ease-in-out;
}JS:
function startAnimation() {
document.getElementById('box').classList.add('animate');
}This way, the animation will not be performed when the page is loaded, and it will not start until the user operation or certain conditions are met.
Let's summarize
- If you want to control the animation switch at any time, use
animation-play-state. - If you just don't let the animation start for the time being, use
animation-delay. - If you want to completely control whether to enable animations by JS, it is recommended to add dynamic classes.
Basically, these are the methods, which one to choose depends on the specific needs. It is not complicated, but it is easy to ignore details, such as browser compatibility or JS operation methods. Just pay attention to it.
The above is the detailed content of How to stop CSS animations from running on page load?. For more information, please follow other related articles on the PHP Chinese website!
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