Created
November 22, 2019 07:20
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simple solution to add sticky header for bootstrap 4 tables
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| let style = document.createElement('style') | |
| document.head.appendChild(style) | |
| document.addEventListener('scroll', () => { | |
| let table = document.querySelector('.table') | |
| if (!table) return | |
| let navbar = document.querySelector('.navbar') | |
| if (!navbar) return | |
| let offset = table.getBoundingClientRect().top + window.scrollY - navbar.offsetHeight | |
| let second = document.querySelector('.table > thead > tr:nth-child(2) > th') | |
| let secondOffset = 0 | |
| if (second) { | |
| let first = document.querySelector('.table > thead > tr:nth-child(1) > th') | |
| secondOffset = second.getBoundingClientRect().top - first.getBoundingClientRect().top | |
| } | |
| if (window.scrollY <= offset) { | |
| style.innerHTML = '' | |
| } else { | |
| style.innerHTML = `.table > thead > tr > th { background: #fff; transition: top 0.2s; position: sticky; } | |
| .table > thead > tr:first-child > th { top: ${window.scrollY - offset}px; } | |
| .table > thead > tr:nth-child(2) > th { top: ${window.scrollY - offset + secondOffset}px; } | |
| .table > thead > tr > th:before { content: ''; position: absolute; top: -2px; left: 0; right: 0; height: 2px; background: #fff; } | |
| .table > thead > tr > th:after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: #dee2e6; }` | |
| } | |
| }) |
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