JavaScript+css3 in APP achieves pull-down refresh effect-JS Tutorial-php.cn

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JavaScript+css3 in APP achieves pull-down refresh effect

ringa_lee

May 11, 2018 pm 02:15 PM

css3 javascript Pull down to refresh

The data list in the native app will use the pull-down refresh effect. In the webapp, it can be implemented using plug-ins or frameworks such as iscroll and swiper. So how can you code it yourself to achieve similar effects? Here is a simple implementation using native js+css3 Effect.

html layout

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<title>test</title>
<style type="text/css" media="screen">
 body{margin: 0;}
 ul{list-style: none;padding: 0;}
 li{height: 30px;border-bottom: 1px solid #ddd;line-height: 30px;padding-left: 10px;}
 .scroller .loading{height: 60px;line-height: 60px;text-align: center;width: 100%;background-color: #f1f1f1;}
 .scroller{-webkit-overflow-scrolling:touch;}
</style> 
</head> 
<body > 
<p id="container" class="scroller" >
<p class="loading">
 下拉刷新数据
</p>
<ul>
 <li><a href="#">列表数据1</a></li>
 <li><a href="#">列表数据2</a></li>
 <li><a href="#">列表数据3</a></li>
 <li><a href="#">列表数据4</a></li>
 <li><a href="#">列表数据5</a></li>
 <li><a href="#">列表数据6</a></li>
 <li><a href="#">列表数据7</a></li>
 <li><a href="#">列表数据8</a></li>
 <li><a href="#">列表数据9</a></li>
 <li><a href="#">列表数据10</a></li>
 <li><a href="#">列表数据11</a></li>
 <li><a href="#">列表数据12</a></li>
 <li><a href="#">列表数据13</a></li>
 <li><a href="#">列表数据14</a></li>
 <li><a href="#">列表数据15</a></li>
 <li><a href="#">列表数据16</a></li>
 <li><a href="#">列表数据17</a></li>
 <li><a href="#">列表数据18</a></li>
 <li><a href="#">列表数据19</a></li>
 <li><a href="#">列表数据20</a></li>
 <li><a href="#">列表数据21</a></li>
 <li><a href="#">列表数据22</a></li>
 <li><a href="#">列表数据23</a></li>
 <li><a href="#">列表数据24</a></li>
 <li><a href="#">列表数据25</a></li>
 <li><a href="#">列表数据26</a></li>
 <li><a href="#">列表数据27</a></li>
 <li><a href="#">列表数据28</a></li>
 <li><a href="#">列表数据29</a></li>
 <li><a href="#">列表数据30</a></li>
</ul> 
</p>
<body>
</html>

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js logic

 var slide = function (option) {
 var defaults={
  container:&#39;&#39;,
  next:function(){}
 }
 var start,
   end,
   length,
   isLock = false,//是否锁定整个操作
   isCanDo = false,//是否移动滑块
   isTouchPad = (/hp-tablet/gi).test(navigator.appVersion),
   hasTouch = &#39;ontouchstart&#39; in window && !isTouchPad;
 var obj = document.querySelector(option.container);
 var loading=obj.firstElementChild;
 var offset=loading.clientHeight;
 var objparent = obj.parentElement;
 /*操作方法*/
 var fn =
 {
  //移动容器
  translate: function (diff) {
   obj.style.webkitTransform=&#39;translate3d(0,&#39;+diff+&#39;px,0)&#39;;
   obj.style.transform=&#39;translate3d(0,&#39;+diff+&#39;px,0)&#39;;
  },
  //设置效果时间
  setTransition: function (time) {
   obj.style.webkitTransition=&#39;all &#39;+time+&#39;s&#39;;
   obj.style.transition=&#39;all &#39;+time+&#39;s&#39;;
  },
  //返回到初始位置
  back: function () {
   fn.translate(0 - offset);
   //标识操作完成
   isLock = false;
  },
  addEvent:function(element,event_name,event_fn){
   if (element.addEventListener) {
    element.addEventListener(event_name, event_fn, false);
   } else if (element.attachEvent) {
    element.attachEvent(&#39;on&#39; + event_name, event_fn);
   } else {
    element[&#39;on&#39; + event_name] = event_fn;
   }
  }
 };

 fn.translate(0-offset);
 fn.addEvent(obj,&#39;touchstart&#39;,start);
 fn.addEvent(obj,&#39;touchmove&#39;,move);
 fn.addEvent(obj,&#39;touchend&#39;,end);
 fn.addEvent(obj,&#39;mousedown&#39;,start)
 fn.addEvent(obj,&#39;mousemove&#39;,move)
 fn.addEvent(obj,&#39;mouseup&#39;,end)

 //滑动开始
 function start(e) {
  if (objparent.scrollTop <= 0 && !isLock) {
   var even = typeof event == "undefined" ? e : event;
   //标识操作进行中
   isLock = true;
   isCanDo = true;
   //保存当前鼠标Y坐标
   start = hasTouch ? even.touches[0].pageY : even.pageY;
   //消除滑块动画时间
   fn.setTransition(0);
   loading.innerHTML=&#39;下拉刷新数据&#39;;
  }
  return false;
 }

 //滑动中
 function move(e) {
  if (objparent.scrollTop <= 0 && isCanDo) {
   var even = typeof event == "undefined" ? e : event;
   //保存当前鼠标Y坐标
   end = hasTouch ? even.touches[0].pageY : even.pageY;
   if (start < end) {
    even.preventDefault();
    //消除滑块动画时间
    fn.setTransition(0);
    //移动滑块
    if((end-start-offset)/2= offset) {
    //设置滑块回弹时间
    fn.setTransition(1);
    //保留提示部分
    fn.translate(0);
    //执行回调函数
    loading.innerHTML=&#39;正在刷新数据&#39;;
    if (typeof option.next == "function") {
     option.next.call(fn, e);
    }
   } else {
    //返回初始状态
    fn.back();
   }
  }
 }
}
slide({container:"#container",next: function (e) {
 //松手之后执行逻辑,ajax请求数据，数据返回后隐藏加载中提示
 var that = this;
 setTimeout(function () {
  that.back.call();
 }, 2000);
}});

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There is not a lot of code, Details still need to be perfected.

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