JavaScript實現水平進度條拖拽效果
阿新 • • 發佈：2019-02-01
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
.scroll{
margin:100px;
width: 500px;
height: 5px;
background: #ccc;
position: relative;
}
.bar{
width: 10px;
height: 20px;
background: #369;
position: absolute;
top: -7px;
left: 0;
cursor: pointer;
}
.mask{
position: absolute;
left: 0;
top: 0;
background: #369;
width: 0;
height: 5px;
}
</style>
</head>
<body>
<div class="scroll" id="scroll">
<div class="bar" id="bar">
</div>
<div class="mask" id="mask"></div>
</div>
<p></p>
<script>
var scroll = document.getElementById('scroll');
var bar = document.getElementById('bar');
var mask = document.getElementById('mask');
var ptxt = document.getElementsByTagName('p')[0];
var barleft = 0;
bar.onmousedown = function(event){
var event = event || window.event;
var leftVal = event.clientX - this.offsetLeft;
var that = this;
// 拖動一定寫到 down 裡面才可以
document.onmousemove = function(event){
var event = event || window.event;
barleft = event.clientX - leftVal;
if(barleft < 0)
barleft = 0;
else if(barleft > scroll.offsetWidth - bar.offsetWidth)
barleft = scroll.offsetWidth - bar.offsetWidth;
mask.style.width = barleft +'px' ;
that.style.left = barleft + "px";
ptxt.innerHTML = "已經走了" + parseInt(barleft/(scroll.offsetWidth-bar.offsetWidth) * 100) + "%";
//防止選擇內容--當拖動滑鼠過快時候，彈起滑鼠，bar也會移動，修復bug
window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
}
}
document.onmouseup = function(){
document.onmousemove = null; //彈起滑鼠不做任何操作
}
</script>
</body>
</html>
效果：
原文：http://www.jb51.net/article/103461.htm