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October 3, 2016 09:52
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Document</title> | |
| <link rel="stylesheet" href="./main.css" /> | |
| </head> | |
| <body> | |
| <div class="area"> | |
| <div class="box">1</div> | |
| <div class="box">2</div> | |
| <div class="box">3</div> | |
| <div class="box">4</div> | |
| <div class="box">5</div> | |
| <div id="target" class="box">6</div> | |
| <div class="box">7</div> | |
| <div class="box">8</div> | |
| <div class="box">9</div> | |
| <div class="box">10</div> | |
| </div> | |
| <script src="./scrollin.js"></script> | |
| </body> | |
| </html> |
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| .area { | |
| position: relative; | |
| display: flex; | |
| flex-direction: column; | |
| align-items: center; | |
| } | |
| .box { | |
| width: 100%; | |
| height: 250px; | |
| margin: 20px; | |
| background-color: #ddd; | |
| border: 1px solid #aaa; | |
| text-align: center; | |
| } | |
| #target { | |
| background-color: #90CAF9; | |
| } |
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| (function(){ | |
| window.addEventListener('scroll', this._scrollIn = (event) => { | |
| let viewportHeight = window.innerHeight; | |
| let targetTop = document.getElementById('target').getBoundingClientRect().top; | |
| if(0 < targetTop && targetTop <= viewportHeight) { | |
| console.log('scrollin!'); // do something | |
| window.removeEventListener('scroll', this._scrollIn); | |
| } | |
| }); | |
| })(); |
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