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| 1 | +<!DOCTYPE html> |
| 2 | +<html lang="en"> |
| 3 | +<head> |
| 4 | + <meta charset="UTF-8"> |
| 5 | + <title>Scoped CSS Variables and JS</title> |
| 6 | +</head> |
| 7 | +<body> |
| 8 | + <h2>Update CSS Variables with <span class='hl'>JS</span></h2> |
| 9 | + |
| 10 | + <div class="controls" rel-controlbox> |
| 11 | + <label for="spacing">Spacing:</label> |
| 12 | + <input type="range" name="padding" min="10" max="200" value="10" data-sizing="px"> |
| 13 | + |
| 14 | + <label for="blur">Blur:</label> |
| 15 | + <input type="range" name="blur" min="0" max="25" value="10" data-sizing="px"> |
| 16 | + |
| 17 | + <label for="base">Base Color</label> |
| 18 | + <input type="color" name="color" value="#ffc600"> |
| 19 | + |
| 20 | + <div class="codeBox"> |
| 21 | + <code> |
| 22 | + img{ |
| 23 | + padding: <span id="js-padding">10</span>px; |
| 24 | + filter: blur(<span id="js-blur">0</span>px); |
| 25 | + background:<span id="js-color">#ffc600</span>; |
| 26 | + } |
| 27 | + </code> |
| 28 | + </div> |
| 29 | + </div> |
| 30 | + |
| 31 | + <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500"> |
| 32 | + |
| 33 | + <style> |
| 34 | + |
| 35 | + /* |
| 36 | + misc styles, nothing to do with CSS variables |
| 37 | + */ |
| 38 | + :root{ |
| 39 | + --padding: 10px; |
| 40 | + --blur: 0px; |
| 41 | + --color: #ffc600; |
| 42 | + } |
| 43 | + img{ |
| 44 | + padding: var(--padding); |
| 45 | + filter: blur(var(--blur)); |
| 46 | + background: var(--color); |
| 47 | + } |
| 48 | + |
| 49 | + body { |
| 50 | + text-align: center; |
| 51 | + } |
| 52 | + |
| 53 | + body { |
| 54 | + background: #193549; |
| 55 | + color: white; |
| 56 | + font-family: 'helvetica neue', sans-serif; |
| 57 | + font-weight: 100; |
| 58 | + font-size: 50px; |
| 59 | + } |
| 60 | + |
| 61 | + .controls { |
| 62 | + margin-bottom: 50px; |
| 63 | + } |
| 64 | + |
| 65 | + input { |
| 66 | + width:100px; |
| 67 | + } |
| 68 | + </style> |
| 69 | + |
| 70 | + <script> |
| 71 | + |
| 72 | + /* |
| 73 | + 业务需求： |
| 74 | + 拖动滑块、选择颜色， |
| 75 | + 1、实时改变对应元素的样式，img使用:root中定义的变量，直接改变根节点的数据即可 |
| 76 | + 2、实时改变code中的代码 |
| 77 | + */ |
| 78 | + const controls = document.querySelectorAll("[rel-controlbox] input"), |
| 79 | + handle = function(){ |
| 80 | + const prefix = this.dataset.sizing || '', |
| 81 | + name = this.name, |
| 82 | + value = this.value; |
| 83 | + document.documentElement.style.setProperty(`--${name}`, value + prefix); |
| 84 | + document.getElementById(`js-${name}`).innerHTML = value; |
| 85 | + }; |
| 86 | + controls.forEach((item)=>{ |
| 87 | + // 鼠标滑动->实时改变 |
| 88 | + item.addEventListener("mousemove", handle, false); |
| 89 | + // 改变值 |
| 90 | + item.addEventListener("change", handle,false); |
| 91 | + }) |
| 92 | + </script> |
| 93 | + |
| 94 | +</body> |
| 95 | +</html> |
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