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js实现兼容PC端和移动端滑块拖动选择数字效果

2019-06-20 11:47 来源:互联网 编辑:admin

本文为大家分享了js实现移动端滑块拖动选择数字的效果,可以通过鼠标拖拽滑动效果来选择数字,供大家参考,具体内容如下

<!DOCTYPE html>
<html lang="zh-cn">

  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    <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
        //事件
        var start = function(e) {
          e.stopPropagation();
          ifBool = true;
          console.log("鼠标按下")
        }
        var move = function(e) {
          console.log("鼠标拖动")
          if(ifBool) {
            if(!e.touches) {  //兼容移动端
              var x = e.clientX;
            } else {   //兼容PC端
              var x = e.touches[0].pageX;
            }
            //var x = e.touches[0].pageX || e.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);
          }
        }
        var end = function(e) {
            console.log("鼠标弹起")
            ifBool = false;
          }
          //鼠标按下方块
        minDiv.addEventListener("touchstart", start);
        minDiv.addEventListener("mousedown", start);
        //拖动
        window.addEventListener("touchmove", move);
        window.addEventListener("mousemove", move);
        //鼠标松开
        window.addEventListener("touchend", end);
        window.addEventListener("mouseup", end);
        //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>

以上就是本文的全部内容,希望对大家的学习有所帮助。

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