55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
---
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title: Bouncing loader
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tags: animation,intermediate
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---
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Creates a bouncing loader animation.
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- `@keyframes` defines an animation that has two states, where the element changes `opacity` and is translated up on the 2D plane using `transform: translate3d()`. Using a single axis translation on `transform: translate3d()` improves the performance of the animation.
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- `.bouncing-loader` is the parent container of the bouncing circles and uses `display: flex` and `justify-content: center` to position them in the center.
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- `.bouncing-loader > div`, targets the three child `div`s of the parent to be styled. The `div`s are given a width and height of `1rem`, using `border-radius: 50%` to turn them from squares to circles.
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- `margin: 3rem 0.2rem` specifies that each circle has a top/bottom margin of `3rem` and left/right margin of `0.2rem` so that they do not directly touch each other, giving them some breathing room.
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- `animation` is a shorthand property for the various animation properties: `animation-name`, `animation-duration`, `animation-iteration-count`, `animation-direction` are used.
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- `nth-child(n)` targets the element which is the nth child of its parent.
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- `animation-delay` is used on the second and third `div` respectively, so that each element does not start the animation at the same time.
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- Note that `1rem` is usually `16px`.
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```html
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<div class="bouncing-loader">
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<div></div>
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<div></div>
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<div></div>
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</div>
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```
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```css
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@keyframes bouncing-loader {
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to {
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opacity: 0.1;
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transform: translate3d(0, -1rem, 0);
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}
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}
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.bouncing-loader {
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display: flex;
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justify-content: center;
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}
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.bouncing-loader > div {
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width: 1rem;
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height: 1rem;
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margin: 3rem 0.2rem;
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background: #8385aa;
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border-radius: 50%;
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animation: bouncing-loader 0.6s infinite alternate;
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}
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.bouncing-loader > div:nth-child(2) {
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animation-delay: 0.2s;
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}
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.bouncing-loader > div:nth-child(3) {
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animation-delay: 0.4s;
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}
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```
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