Created
November 26, 2019 04:14
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open/collapse for an element with `height: auto`
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| <html> | |
| <head> | |
| <style> | |
| .item { | |
| display: block; | |
| overflow: hidden; | |
| } | |
| .head { | |
| height: 30px; | |
| line-height: 30px; | |
| background: tomato; | |
| color: white; | |
| } | |
| .content { | |
| opacity: 0; | |
| visibility: hidden; | |
| border: 1px solid #eee; | |
| height: 0; | |
| transition: all 0.3s; | |
| overflow: hidden; | |
| } | |
| .content.active { | |
| opacity: 0; | |
| visibility: visible; | |
| height: auto; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="item"> | |
| <div class="head">head</div> | |
| <div class="content">body</div> | |
| </div> | |
| hoge | |
| <script> | |
| const item = document.querySelector('.item'); | |
| const head = document.querySelector('.head'); | |
| const content = document.querySelector('.content'); | |
| head.addEventListener('click', () => { | |
| content.classList.toggle('active'); | |
| if (content.classList.contains('active')) { | |
| const height = content.getBoundingClientRect().height; | |
| content.style.height = '0px'; | |
| window.requestAnimationFrame(() => { | |
| content.style.height = `${height}px`; | |
| content.style.opacity = 1; | |
| }); | |
| } else { | |
| content.style.height = ''; | |
| } | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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