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js implements sliding progress bar

coldplay.xixiforward: 2020-08-21 17:33:282868browse

[Related learning recommendations: javascript video tutorial]

The example of this article shares with you the specific code for realizing the sliding progress bar effect in js. For your reference, the specific content is as follows

Progress bar:

<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8" />
 <title>js滑动进度条效果</title>
 <style>
  *{margin:0;padding:0;user-select:none;}
  .progress-bar{position:relative;height:10px;width:400px;margin:200px auto;background:#ebeef5;border-radius:10px;}
  .progress-bar .pro-bar{position:absolute;left:0;height:10px;width:10px;background:#409eff;}
  .progress-bar .min-num{position:absolute;left:-20px;top:-5px;}
  .progress-bar .max-num{position:absolute;right:-40px;top:-5px;}
  .progress-bar .block {position:absolute;height:30px;width:10px;background:#ccc;top:-10px;border-radius:10px;}
  .progress-bar .block p{position:absolute;display:none;left:-20px;top:-45px;width:50px;height:30px;text-align:center;line-height:30px;background:#ccc;border-radius:20px;}
  .progress-bar .block:hover p{display:block;font-size:10%;color:#fff;background:#409eff;}
 </style>
</head>
<body>
 <p class="progress-bar">
 <span class="min-num">0</span>
 <span class="max-num">100</span>
 <p class="pro-bar"></p>
 <p class="block">
  <p>0</p>
 </p>
 </p>
</body>
<script>
 (function(){
 let moveBlock = document.querySelector(&#39;.block&#39;);
 let proBar = document.querySelector(&#39;.pro-bar&#39;);
 let flag = false;
 let startX = null;
 let moveMax = (400 - 10); // 背景条宽度减去滑块的宽度
 moveBlock.onmousedown = function(e){
  startX = e.pageX;
  moveBlock.style.left ? moveBlock.style.left : moveBlock.style.left = &#39;0px&#39;;
  let startLeft = parseInt(moveBlock.style.left);
  document.onmousemove = function(e){
  let moveX = (e.pageX - startX) > 0 ? true : false;
  let moveSection = startLeft + (e.pageX - startX);
  // 限定移动范围
  if (moveSection >= 0 && moveSection <= moveMax) {
   let percent = ((startLeft + (e.pageX - startX)) / moveMax).toFixed(4) * 100;
   percent.toString().length > 5 ? percent = percent.toString().subStr(0, 5) : percent = percent.toString();
   moveBlock.style.left = startLeft + (e.pageX - startX) + &#39;px&#39;;
   proBar.style.width = moveBlock.style.left;
   moveBlock.querySelector(&#39;p&#39;).innerText = percent + &#39;%&#39;;
  }
  };
 };
 // 鼠标松开移除事件
 moveBlock.onmouseup = function(){
  document.onmousemove = null;
 };
 })();
</script>
</html>

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