How to implement full-screen sliding on mobile terminals with JS-JS Tutorial-php.cn

How to implement full-screen sliding on mobile terminals with JS

小云云

Release： 2018-05-14 10:25:48

Original

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This article uses example code to share with you the full-screen sliding effect on mobile based on js. The basic idea is to detect the sliding direction of the finger, obtain the position when the finger is lifted, and subtract the position when the finger is pressed. The correct result is the direction. After sliding down, this article will share with you the example code of JS to realize full screen sliding on the mobile terminal.

Basic idea:

1) Detect the finger sliding direction: get the position when the finger is lifted, subtract the position when the finger is pressed , getting it right means sliding down

2) After lifting the finger, change the position of the current page in the corresponding reverse operation

The specific code is as follows:

html

<p id="wrap">
  <p id="page01" class="pages">第一屏</p>
  <p id="page02" class="pages">第二屏</p>
  <p id="page03" class="pages">第三屏</p>
  <p id="page04" class="pages">第四屏</p>
</p>
<p id="dots">
  <span class="now"></span><span class=""></span><span class=""></span><span class=""></span>
</p>

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css

*{
      margin:0;
      padding:0;
    }
    body{
      overflow: hidden;
    }
    #wrap > p{
      width: 10rem;
      position: absolute;
      left: 0;
      top: 0;
      background: #fff;
      transition: all 0.3s ease;
    }
    #dots{
      position: fixed;
      right: 5px;
      top: 40%;
      z-index: 9;
    }
    #dots span{
      display: block;
      height: 0.2rem;
      width: 0.2rem;
      border: 1px solid #000;
      border-radius: 50%;
      margin-bottom: 3px;
    }
    #dots .now{
      background: #555;
    }

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js is divided into two parts

First, set the font-size of the html tag in order to set the base of rem (put in Page header)

document.getElementsByTagName("html")[0].style.fontSize = window.innerWidth/10 + "px";

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Second, the specific sliding operation code

 window.onload = function(){
      var op = document.getElementById("wrap");
      var aPages = op.getElementsByClassName("pages");
      var aDots = document.getElementById("dots").getElementsByTagName("span");
      var winH = window.innerHeight;
      var tTime = 1;
      //设置每页的高度和zindex值
      for(var i=0; i<aPages.length; i++){
        aPages[i].style.height = winH + "px";
        aPages[i].style.zIndex = 1;
      }
      aPages[0].style.zIndex = 3;
      aPages[1].style.zIndex = 2;
      op.style.height = winH + "px";
      //手指拖动事件（去除默认动作）
      document.addEventListener("touchmove",function(e){
        e.preventDefault();
      });
      var YStart = 0;
      var iNow = 0;
      //手指按下
      op.addEventListener("touchstart",function(e){
        YStart = e.changedTouches[0].clientY;
      });
      //手指移动
      op.addEventListener("touchmove",function(e){
        disY = e.changedTouches[0].clientY-YStart; //向下滑正，向上滑负
      });
      //手指离开
      op.addEventListener("touchend",function(e){
        disY = e.changedTouches[0].clientY-YStart; //向下滑正，向上滑负
        if(Math.abs(disY)>winH/20){ //只有当滑动距离大于了一定值得时候，才执行切换
          if(disY<0){
            iNow++;
            if(iNow>=aDots.length){
              iNow = 0;
            }
            aPages[0].style.transform = "translateY("+ -winH +"px)";
            doSlide();
          }else{
            iNow--;
            if(iNow<0){
              iNow = aDots.length-1;
            }
            aPages[0].style.transform = "translateY("+ winH +"px)";
            doSlide("up");
          }
        }
      });
      function doSlide(upflag){
        for(var i=0;i<aDots.length;i++){
          aDots[i].className = "";
        }
        aDots[iNow].className = "now";
        if(upflag){
            //向上滑
            aPages[3].style.zIndex = 2;
            aPages[1].style.zIndex = 1;
            op.insertBefore(aPages[3],aPages[1]);
            setTimeout(function(){
              aPages[1].style.transform = "translateY(0px)";
              aPages[1].style.zIndex = 2;
              aPages[0].style.zIndex = 3;
            },300)
        }else{
          setTimeout(function(){
            aPages[0].style.transform = "translateY(0px)";
            aPages[0].style.zIndex = 1;
            aPages[1].style.zIndex = 3;
            aPages[2].style.zIndex = 2;
            op.appendChild(aPages[0]);
          },300)
        }
      }
    }

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Okay, let me share with you a simple code to implement full-page sliding on the mobile side with JS Screen display, the specific code is as follows:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8"/>
    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=0" />
    <meta name="format-detection" content="telephone=no" />
    <meta content="yes" name="mobile-web-app-capable">
    <meta content="yes" name="apple-mobile-web-app-capable" />
    <meta http-equiv="Cache-Control" content="no-siteapp" />
    <title>移动端整页滑屏示例</title>
    <style type="text/css">
      * {
        padding: 0;
        margin: 0;
        font-family: Verdana;
      }
      body,
      html {
        height: 100%;
        background-color: #000000;
      }
      .wrap {
        width: 100%;
        height: 100%;
        overflow: hidden;
      }
      .wrap2 {
        width: 100%;
        height: 1000%;
        transition: 0.3s linear
      }
      .page {
        width: 100%;
        height: 10%
      }
      .page {
        background-color: #fdfdfd;
        font-size: 100px;
        line-height: 400px;
        text-align: center;
        font-weight: bold;
      }
    </style>
  </head>
  <body>
    <p class="wrap" id="wrap">
      <p class="wrap2" id="wrap2">
        <p class="page">1</p>
        <p class="page" style="background-color:#dddddd;">2</p>
        <p class="page">3</p>
        <p class="page" style="background-color:#dddddd;">4</p>
        <p class="page">5</p>
        <p class="page" style="background-color:#dddddd;">6</p>
      </p>
    </p>
    <script type="text/javascript">
      //重要！禁止移动端滑动的默认事件
      document.body.addEventListener(&#39;touchmove&#39;, function(event) {
        event = event ? event : window.event;
        if(event.preventDefault) {
          event.preventDefault()
        } else {
          event.returnValue = false
        }
      }, false)
      var pages = function(obj) {
        var box = document.getElementById(obj.wrap);
        var box2 = document.getElementById(obj.wrap2);
        var len = obj.len;
        var n = obj.n;
        var startY, moveY, cliH;
        //获取屏幕高度
        var getH = function() {
          cliH = document.body.clientHeight
        };
        getH();
        window.addEventListener(&#39;resize&#39;, getH, false);
        //touchStart
        var touchstart = function(event) {
          if(!event.touches.length) {
            return;
          }
          startY = event.touches[0].pageY;
          moveY = 0;
        };
        //touchMove
        var touchmove = function(event) {
          if(!event.touches.length) {
            return;
          }
          moveY = event.touches[0].pageY - startY;
          box2.style.transform = &#39;translateY(&#39; + (-n * cliH + moveY) + &#39;px)&#39;; //根据手指的位置移动页面
        };
        //touchEnd
        var touchend = function(event) {
          //位移小于+-50的不翻页
          if(moveY < -50) n++;
          if(moveY > 50) n--;
          //最后&最前页控制
          if(n < 0) n = 0;
          if(n > len - 1) n = len - 1;
          //重定位
          box2.style.transform = &#39;translateY(&#39; + (-n * 10) + &#39;%)&#39;; //根据百分比位置移动页面
          console.log(n)
        };
        //touch事件绑定
        box.addEventListener("touchstart", function(event) {
          touchstart(event)
        }, false);
        box.addEventListener("touchmove", function(event) {
          touchmove(event)
        }, false);
        box.addEventListener("touchend", function(event) {
          touchend(event)
        }, false);
      };
      pages({
        wrap: &#39;wrap&#39;, //.wrap的id
        wrap2: &#39;wrap2&#39;, //.wrap2的id
        len: 6, //一共有几页
        n: 0 //页面一打开默认在第几页？第一页就是0，第二页就是1
      });
    </script>
  </body>
</html>

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