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自定义拖动进度条，包含样式和事件

2018-09-18 06:33:24来源：博客园阅读 ()

自定义可拖动的进度条，如下图效果：

代码分三部分

HTML

 1 <body>
 2     <div id="demo">
 3 
 4         <div class="progress">
 5             <div class="progress-bar">
 6                 <div class="progress-thumb"></div>
 7             </div>
 8         </div>
 9 
10     </div>
11 </body>

CSS

 1 #demo { 
 2     width: 600px; height: 100px; margin: 100px auto; 
 3     display: flex; align-items: center; 
 4 }
 5 
 6 #demo .progress { 
 7     width: 100%; height: 6px; border-radius: 3px; 
 8     background: #F1F5FD; 
 9 }
10 
11 #demo .progress .progress-bar { 
12     width: 40%; height: 100%; border-radius: 3px; 
13     background: #0072FF; 
14 }
15 
16 #demo .progress .progress-bar .progress-thumb { 
17     width: 14px; height: 14px; border-radius: 50%; 
18     background: #FFFFFF; box-shadow: 0 0 15px 5px #0072FF; 
19     float: right; 
20     position: relative; left: 7px; top: -5px; 
21 }

到这步就基本实现了自定义的样式，只需改变 .progress-bar 的 width 就能显示不同的进度；接下来给进度条加上拖动事件

JavaScript

 1     <script>
 2            
 3         var slider = {
 4             use: function(id) {
 5                 var self = this;
 6                 self.slider = document.getElementById(id);
 7                 self.bar = self.slider.querySelector('.progress-bar');
 8                 self.thumb = self.slider.querySelector('.progress-thumb');
 9                 self.slider.addEventListener('mousedown', function(e) {
10                     if (e.button == 0) { // 判断点击左键
11                         self.mDown = true;
12                         self.beginX = e.offsetX;
13                         self.positionX = e.offsetX;
14                         self.beginClientX = e.clientX;
15                         self.sliderLong = parseInt(self.getStyle(self.slider, 'width'));
16                         var per = parseInt(self.positionX / self.sliderLong * 100);
17                         self.bar.style.width = per + '%';
18                     }
19                 });
20                 document.addEventListener('mousemove', function(e) {
21                     if (self.mDown) {
22                         var moveX = e.clientX - self.beginClientX;
23                         self.positionX = (self.beginX + moveX > self.sliderLong) ? self.sliderLong : (self.beginX + moveX < 0) ? 0 : self.beginX + moveX;
24                         var per = parseInt(self.positionX / self.sliderLong * 100);
25                         self.bar.style.width = per + '%';
26                     }
27                 });
28                 document.addEventListener('mouseup', function(e) {
29                     if (e.button == 0) { 
30                         self.mDown = false;
31                     }
32                 });
33             },
34             getStyle: function(obj,styleName){ // 获取元素样式的方法
35                 if(obj.currentStyle){
36                     return obj.currentStyle[styleName];
37                 }else{
38                     return getComputedStyle(obj,null)[styleName];
39                 }
40             }
41         };
42         slider.use('demo');
43 
44     </script>