Created
August 4, 2017 13:59
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Pure JS image zoom
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| <figure | |
| id="figure" | |
| > | |
| <img | |
| id="img" | |
| src="" | |
| /> | |
| </figure> | |
| Magnification level: <input id="input" type="number" value="200" /> | |
| <br /> | |
| Image url: <input | |
| id="input2" | |
| type="text" | |
| value="https://res.cloudinary.com/active-bridge/image/upload/slide1.jpg" | |
| /> |
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| console.clear() | |
| const { Observable } = Rx | |
| optimizeUIEvent('mousemove', document) | |
| const figure = document.getElementById('figure') | |
| const img = document.getElementById('img') | |
| const input = document.getElementById('input') | |
| const input2 = document.getElementById('input2') | |
| const getMouseMove$ = () => Observable.fromEvent(document, 'mousemove') | |
| const mouseOut$ = Observable.fromEvent(figure, 'mouseout') | |
| const moseOver$ = Observable.fromEvent(figure, 'mouseover') | |
| .switchMap(() => | |
| getMouseMove$() | |
| .takeUntil(mouseOut$) | |
| ) | |
| .map(zoom(figure)) | |
| .forEach(({ x, y }) => { | |
| figure.style.backgroundPosition = `${x}% ${y}%` | |
| }) | |
| const magnificationInput$ = Observable.fromEvent(input, 'keyup') | |
| magnificationInput$ | |
| .map(e => e.target.value) | |
| .startWith("200") | |
| .forEach( | |
| val => { | |
| figure.style.backgroundSize = `${val}%` | |
| } | |
| ) | |
| const imageInput$ = Observable.fromEvent(input2, 'keyup') | |
| imageInput$ | |
| .map(e => e.target.value) | |
| .startWith("https://res.cloudinary.com/active-bridge/image/upload/slide1.jpg") | |
| .forEach( | |
| url => { | |
| figure.style.backgroundImage = `url(${url})` | |
| img.src = url | |
| } | |
| ) | |
| function zoom(figure) { | |
| return e => { | |
| let offsetX, offsetY, x, y | |
| offsetX = e.offsetX | |
| offsetY = e.offsetY | |
| x = offsetX / figure.offsetWidth * 100 | |
| y = offsetY / figure.offsetHeight * 100 | |
| return { x, y } | |
| } | |
| } |
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| <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> | |
| <script src="https://unpkg.com/rx@4.1.0/dist/rx.all.min.js"></script> | |
| <script src="https://unpkg.com/optimize-ui-event@0.0.2"></script> |
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| figure { | |
| display: block; | |
| img:hover { | |
| opacity: 0; | |
| cursor: zoom-in; | |
| } | |
| img { | |
| transition: opacity .5s; | |
| display: block; | |
| width: 100%; | |
| } | |
| position: relative; | |
| width: 500px; | |
| overflow: hidden; | |
| } |
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