136 lines
2.9 KiB
Markdown
136 lines
2.9 KiB
Markdown
### Mouse cursor gradient tracking
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A hover effect where the gradient follows the mouse cursor.
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#### HTML
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```html
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<button class="mouse-cursor-gradient-tracking">
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<span>Hover me</span>
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</button>
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```
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#### CSS
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```css
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.mouse-cursor-gradient-tracking {
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position: relative;
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background: #2379f7;
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padding: 0.5rem 1rem;
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font-size: 1.2rem;
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border: none;
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color: white;
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cursor: pointer;
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outline: none;
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overflow: hidden;
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}
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.mouse-cursor-gradient-tracking span {
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position: relative;
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}
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.mouse-cursor-gradient-tracking::before {
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--size: 0;
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content: '';
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position: absolute;
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left: var(--x);
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top: var(--y);
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width: var(--size);
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height: var(--size);
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background: radial-gradient(circle closest-side, pink, transparent);
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transform: translate(-50%, -50%);
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transition: width .2s ease, height .2s ease;
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}
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.mouse-cursor-gradient-tracking:hover::before {
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--size: 200px;
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}
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```
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#### JavaScript
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```js
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var btn = document.querySelector('.mouse-cursor-gradient-tracking')
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btn.onmousemove = function (e) {
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var x = e.pageX - btn.offsetLeft
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var y = e.pageY - btn.offsetTop
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btn.style.setProperty('--x', x + 'px')
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btn.style.setProperty('--y', y + 'px')
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}
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```
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#### Demo
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<div class="snippet-demo">
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<button class="snippet-demo__mouse-cursor-gradient-tracking">
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<span>Hover me</span>
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</button>
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</div>
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<style>
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.snippet-demo__mouse-cursor-gradient-tracking {
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position: relative;
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background: #2379f7;
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padding: 0.5rem 1rem;
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font-size: 1.2rem;
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border: none;
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color: white;
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cursor: pointer;
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outline: none;
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overflow: hidden;
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}
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.snippet-demo__mouse-cursor-gradient-tracking span {
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position: relative;
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}
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.snippet-demo__mouse-cursor-gradient-tracking::before {
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--size: 0;
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content: '';
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position: absolute;
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left: var(--x);
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top: var(--y);
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width: var(--size);
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height: var(--size);
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background: radial-gradient(circle closest-side, aqua, rgba(0,255,255,0.0001));
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transform: translate(-50%, -50%);
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transition: width .2s ease, height .2s ease;
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}
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.snippet-demo__mouse-cursor-gradient-tracking:hover::before {
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--size: 200px;
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}
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</style>
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<script>
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(function () {
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var btn = document.querySelector('.snippet-demo__mouse-cursor-gradient-tracking')
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btn.onmousemove = function (e) {
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var x = e.pageX - btn.offsetLeft - btn.offsetParent.offsetLeft
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var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
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btn.style.setProperty('--x', x + 'px')
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btn.style.setProperty('--y', y + 'px')
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}
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})()
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</script>
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#### Explanation
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_TODO_
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**Note!**
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If the element's parent has a positioning context (`position: relative`), you will need to subtract
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its offsets as well.
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```js
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var x = e.pageX - btn.offsetLeft - btn.offsetParent.offsetLeft
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var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
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```
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#### Browser support
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<div class="snippet__requires-javascript">Requires JavaScript</div>
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<span class="snippet__support-note">⚠️ Requires JavaScript.</span>
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* https://caniuse.com/#feat=css-variables
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