Created
June 21, 2018 01:58
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IntersectionObserver demo
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width,initial-scale=1"> | |
| <title>Intersection Observer DEMO | labs.jxck.io</title> | |
| <style> | |
| body { | |
| width: 100%; | |
| height: 1200px; | |
| font-size: 2em; | |
| } | |
| #hoge { | |
| margin: 1em; | |
| width: 500px; | |
| height: 50%; | |
| background-color: #ccc; | |
| box-sizing: border-box; | |
| } | |
| #pad1, | |
| #pad2 { | |
| margin: 1em; | |
| width: 500px; | |
| height: 200px; | |
| background-color: #ccc; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="hoge"></div> | |
| <div id="pad1" style="display: none">1</div> | |
| <div class="next-inner-page-link"> | |
| <input type="button">button</input> | |
| </div> | |
| <div id="pad2" style="display: none">2</div> | |
| <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script> | |
| <script> | |
| if (document.querySelector('.next-inner-page-link') !== null) { | |
| const ob = new IntersectionObserver(function (entry, ob) { | |
| for (var e of entry) { | |
| if (!e.isIntersecting) return | |
| setTimeout(() => { | |
| document.getElementById('pad1').style.display = 'block'; | |
| document.getElementById('pad2').style.display = 'block'; | |
| ob.unobserve(e.target) | |
| }, 1000); | |
| } | |
| }, { | |
| threshold: [0, 0.5, 1.0] | |
| }); | |
| ob.observe(document.querySelector('.next-inner-page-link')) | |
| } | |
| </script> | |
| </body> | |
| </html> |
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