基于JavaScript实现拖动滑块效果

2019-11-19 17:32:40

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本文实例为大家分享了js拖动滑块效果的具体代码，供大家参考，具体内容如下

效果：

代码：

<!DOCTYPE html><html lang="zh-cn"> <head>  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">  <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />  <title>鼠标拖动小方块</title>  <style type="text/css">   .lineDiv {    position: relative;    height: 5px;    background: red;    width: 300px;    margin: 50px auto;   }   .lineDiv .minDiv {    position: absolute;    top: -5px;    left: 0;    width: 15px;    height: 15px;    background: green;    cursor: pointer   }   .lineDiv .minDiv .vals {    position: absolute;    font-size: 20px;    top: -45px;    left: -10px;    width: 35px;    height: 35px;    line-height: 35px;    text-align: center;    background: blue;   }   .lineDiv .minDiv .vals:after {    content: "";    width: 0px;    height: 0px;    border-top: 6px solid blue;    border-left: 6px solid transparent;    border-right: 6px solid transparent;    border-bottom: 6px solid transparent;    display: block;    margin-left: 11px;   }  </style> </head> <body>  <center>   <h3>用鼠标拖动小方块<span id="msg">0</span>%</h3>  </center>  <div id="lineDiv" class="lineDiv">   <div id="minDiv" class="minDiv">    <div id="vals" class="vals">0</div>   </div>  </div>  <script>   window.onload = function() {    var lineDiv = document.getElementById('lineDiv'); //长线条    var minDiv = document.getElementById('minDiv'); //小方块    var msg = document.getElementById("msg");    var vals = document.getElementById("vals");    var ifBool = false; //判断鼠标是否按下    //鼠标按下方块    minDiv.addEventListener("touchstart", function(e) {     e.stopPropagation();     ifBool = true;     console.log("鼠标按下")    });    //拖动    window.addEventListener("touchmove", function(e) {     console.log("鼠标拖动")     if(ifBool) {      var x = e.touches[0].pageX || e.touches[0].clientX; //鼠标横坐标var x      var lineDiv_left = getPosition(lineDiv).left; //长线条的横坐标      var minDiv_left = x - lineDiv_left; //小方块相对于父元素（长线条）的left值       if(minDiv_left >= lineDiv.offsetWidth - 15) {       minDiv_left = lineDiv.offsetWidth - 15;      }      if(minDiv_left < 0) {       minDiv_left = 0;      }      //设置拖动后小方块的left值      minDiv.style.left = minDiv_left + "px";      msg.innerText = parseInt((minDiv_left / (lineDiv.offsetWidth - 15)) * 100);      vals.innerText = parseInt((minDiv_left / (lineDiv.offsetWidth - 15)) * 100);     }    });    //鼠标松开    window.addEventListener("touchend", function(e) {     console.log("鼠标弹起")     ifBool = false;    });    //获取元素的绝对位置    function getPosition(node) {     var left = node.offsetLeft; //获取元素相对于其父元素的left值var left     var top = node.offsetTop;     current = node.offsetParent; // 取得元素的offsetParent     　 // 一直循环直到根元素     　　     while(current != null) {　　      left += current.offsetLeft;　　      top += current.offsetTop;　　      current = current.offsetParent;　　     }     return {      "left": left,      "top": top     };    }   }  </script> </body></html>

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