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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】

作者:最骚的就是你

这篇文章主要介绍了原生js实现可兼容PC和移动端的拖动滑块功能,结合实例形式详细分析了javascript事件响应及页面元素属性动态操作实现滑块拖动功能的相关操作技巧,需要的朋友可以参考下

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:

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

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

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:

<!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>

感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具http://tools.jb51.net/code/HtmlJsRun测试上述代码运行效果。

更多关于JavaScript相关内容可查看本站专题:《JavaScript页面元素操作技巧总结》、《JavaScript操作DOM技巧总结》、《JavaScript切换特效与技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》及《JavaScript数学运算用法总结

希望本文所述对大家JavaScript程序设计有所帮助。

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