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原生js实现可兼容PC和移动端的拖动滑块功能详解【测试可用】

时间:2019-08-15来源/作者:最骚的就是你 编辑:源码库 文章热度:

本文实例讲述了原生js实现可兼容PC和移动端的拖动滑块功能。分享给大家供大家参考,具体如下:

废话少说:

js,PC,移动端,拖动滑块

在PC端可以用mousedown来触发一个滑块滑动的效果,但在手机上,貌似无法识别这个事件,但手机上有touchstart事件,可以通过一系列“touch”事件来替代PC端的“mouse”事件。

移动端触屏滑动的效果其实就是图片轮播,在PC的页面上很好实现,绑定click和mouseover等事件来完成。但是在移动设备上,要实现这种轮播的效果,就需要用到核心的touch事件。处理touch事件能跟踪到屏幕滑动的每根手指。

以下是四种touch事件

  • touchstart:     //手指放到屏幕上时触发
  • touchmove:      //手指在屏幕上滑动式触发
  • touchend:    //手指离开屏幕时触发
  • touchcancel:     //系统取消touch事件的时候触发,这个好像比较少用

每个触摸事件被触发后,会生成一个event对象,event对象里额外包括以下三个触摸列表

  • touches:     //当前屏幕上所有手指的列表
  • targetTouches:      //当前dom元素上手指的列表,尽量使用这个代替touches
  • changedTouches:     //涉及当前事件的手指的列表,尽量使用这个代替touches

这些列表里的每次触摸由touch对象组成,touch对象里包含着触摸信息,主要属性如下:

  • clientX / clientY:      //触摸点相对浏览器窗口的位置
  • pageX / pageY:       //触摸点相对于页面的位置
  • screenX  /  screenY:    //触摸点相对于屏幕的位置
  • identifier:        //touch对象的ID
  • target:       //当前的DOM元素
<!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>

兼容PC端和移动端:

<!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
        //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>

希望本文所述对大家JavaScript程序设计有所帮助。


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