js imitates the operation of sliding the contact to the left and sliding out the delete button in QQ-JS Tutorial-php.cn

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js imitates the operation of sliding the contact to the left and sliding out the delete button in QQ

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Jun 25, 2018 pm 04:49 PM

This article mainly introduces the operation of sliding the contact to the left and sliding out the delete button in js imitating QQ, that is, writing a js plug-in for sliding left to delete interactive effects. Interested friends can refer to it

The example in this article is to share with you the operation similar to that of contacts in QQ: slide to the left and slide out the delete button. If you release it when it slides more than halfway, it will automatically slide to the bottom. If you release it when it is less than halfway, it will return to the original position.

Pure js implementation
Uses h5's touchmove and other events, and uses js to dynamically change the translate attribute of css3 to achieve animation effects:

<!DOCTYPE html>
<html lang="en">

<head>
 <meta charset="UTF-8">
 <meta name="viewport" id="viewport" content="width=device-width, initial-scale=1">
 <title>html5向左滑动删除特效</title>
 <style>
 * {
  padding: 0;
  margin: 0;
  list-style: none;
 }
 
 header {
  background: #f7483b;
  border-bottom: 1px solid #ccc
 }
 
 header h2 {
  text-align: center;
  line-height: 54px;
  font-size: 16px;
  color: #fff
 }
 
 .list-ul {
  overflow: hidden
 }
 
 .list-li {
  line-height: 60px;
  border-bottom: 1px solid #fcfcfc;
  position: relative;
  padding: 0 12px;
  color: #666;
  background: #f2f2f2;
  -webkit-transform: translateX(0px);
 }
 
 .btn {
  position: absolute;
  top: 0;
  right: -80px;
  text-align: center;
  background: #ffcb20;
  color: #fff;
  width: 80px
 }
 </style>
 <script>
 /*
  * 描述：html5苹果手机向左滑动删除特效
  */
 window.addEventListener(&#39;load&#39;, function() {
  var initX; //触摸位置
  var moveX; //滑动时的位置
  var X = 0; //移动距离
  var objX = 0; //目标对象位置
  window.addEventListener(&#39;touchstart&#39;, function(event) {
   event.preventDefault();
   var obj = event.target.parentNode;
   if (obj.className == "list-li") {
    initX = event.targetTouches[0].pageX;
    objX = (obj.style.WebkitTransform.replace(/translateX\(/g, "").replace(/px\)/g, "")) * 1;
   }
   if (objX == 0) {
    window.addEventListener(&#39;touchmove&#39;, function(event) {
     event.preventDefault();
     var obj = event.target.parentNode;
     if (obj.className == "list-li") {
      moveX = event.targetTouches[0].pageX;
      X = moveX - initX;
      if (X >= 0) {
       obj.style.WebkitTransform = "translateX(" + 0 + "px)";
      } else if (X < 0) {
       var l = Math.abs(X);
       obj.style.WebkitTransform = "translateX(" + -l + "px)";
       if (l > 80) {
        l = 80;
        obj.style.WebkitTransform = "translateX(" + -l + "px)";
       }
      }
     }
    });
   } else if (objX < 0) {
    window.addEventListener(&#39;touchmove&#39;, function(event) {
     event.preventDefault();
     var obj = event.target.parentNode;
     if (obj.className == "list-li") {
      moveX = event.targetTouches[0].pageX;
      X = moveX - initX;
      if (X >= 0) {
       var r = -80 + Math.abs(X);
       obj.style.WebkitTransform = "translateX(" + r + "px)";
       if (r > 0) {
        r = 0;
        obj.style.WebkitTransform = "translateX(" + r + "px)";
       }
      } else { //向左滑动
       obj.style.WebkitTransform = "translateX(" + -80 + "px)";
      }
     }
    });
   }

  })
  window.addEventListener(&#39;touchend&#39;, function(event) {
   event.preventDefault();
   var obj = event.target.parentNode;
   if (obj.className == "list-li") {
    objX = (obj.style.WebkitTransform.replace(/translateX\(/g, "").replace(/px\)/g, "")) * 1;
    if (objX > -40) {
     obj.style.WebkitTransform = "translateX(" + 0 + "px)";
     objX = 0;
    } else {
     obj.style.WebkitTransform = "translateX(" + -80 + "px)";
     objX = -80;
    }
   }
  })
 })
 </script>
</head>

<body>
 <header>
  <h2>消息列表</h2>
 </header>
 <section class="list">
  <ul class="list-ul">
   <li id="li" class="list-li">
    <p class="con">
     你的快递到了，请到楼下签收
    </p>
    <p class="btn">删除</p>
   </li>
   <li class="list-li">
    <p class="con">
     哇，你在干嘛，快点来啊就等你了
    </p>
    <p class="btn">删除</p>
   </li>
  </ul>
 </section>
</body>

</html>

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Made into zepto plug-in
In actual projects, we may use this function in many places. Now we will make this function into a zepto plug-in for easy use later.

For this plug-in, we only implement this function, and then pass in the parameters (the style name of the delete button) to let the program calculate the required sliding distance in js for easy reuse.

zepto.touchWipe.js

/**
 * zepto插件：向左滑动删除动效
 * 使用方法：$(&#39;.itemWipe&#39;).touchWipe({itemDelete: &#39;.item-delete&#39;});
 * 参数：itemDelete 删除按钮的样式名
 */
;
(function($) {
 $.fn.touchWipe = function(option) {
  var defaults = {
   itemDelete: &#39;.item-delete&#39;, //删除元素
  };
  var opts = $.extend({}, defaults, option); //配置选项

  var delWidth = $(opts.itemDelete).width();

  var initX; //触摸位置
  var moveX; //滑动时的位置
  var X = 0; //移动距离
  var objX = 0; //目标对象位置
  $(this).on(&#39;touchstart&#39;, function(event) {
   event.preventDefault();
   var obj = this;
   initX = event.targetTouches[0].pageX;
   objX = (obj.style.WebkitTransform.replace(/translateX\(/g, "").replace(/px\)/g, "")) * 1;
   if (objX == 0) {
    $(this).on(&#39;touchmove&#39;, function(event) {
     event.preventDefault();
     var obj = this;
     moveX = event.targetTouches[0].pageX;
     X = moveX - initX;
     if (X >= 0) {
      obj.style.WebkitTransform = "translateX(" + 0 + "px)";
     } else if (X < 0) {
      var l = Math.abs(X);
      obj.style.WebkitTransform = "translateX(" + -l + "px)";
      if (l > delWidth) {
       l = delWidth;
       obj.style.WebkitTransform = "translateX(" + -l + "px)";
      }
     }
    });
   } else if (objX < 0) {
    $(this).on(&#39;touchmove&#39;, function(event) {
     event.preventDefault();
     var obj = this;
     moveX = event.targetTouches[0].pageX;
     X = moveX - initX;
     if (X >= 0) {
      var r = -delWidth + Math.abs(X);
      obj.style.WebkitTransform = "translateX(" + r + "px)";
      if (r > 0) {
       r = 0;
       obj.style.WebkitTransform = "translateX(" + r + "px)";
      }
     } else { //向左滑动
      obj.style.WebkitTransform = "translateX(" + -delWidth + "px)";
     }
    });
   }

  })
  $(this).on(&#39;touchend&#39;, function(event) {
   event.preventDefault();
   var obj = this;
   objX = (obj.style.WebkitTransform.replace(/translateX\(/g, "").replace(/px\)/g, "")) * 1;
   if (objX > -delWidth / 2) {
    obj.style.transition = "all 0.2s";
    obj.style.WebkitTransform = "translateX(" + 0 + "px)";
    obj.style.transition = "all 0";
    objX = 0;
   } else {
    obj.style.transition = "all 0.2s";
    obj.style.WebkitTransform = "translateX(" + -delWidth + "px)";
    obj.style.transition = "all 0";
    objX = -delWidth;
   }
  })

  //链式返回
  return this;
 };

})(Zepto);

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touchWipe.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" id="viewport" content="width=device-width, initial-scale=1">
<title>html5向左滑动删除特效</title>

<style>
  *{ padding:0; margin:0; list-style: none;}
  header{ background: #f7483b; border-bottom: 1px solid #ccc}
  header h2{ text-align: center; line-height: 54px; font-size: 16px; color: #fff}
  .list-ul{ overflow: hidden}
  .list-li{ line-height: 60px; border-bottom: 1px solid #fcfcfc; position:relative;padding: 0 12px; color: #666;
    background: #f2f2f2;
    -webkit-transform: translateX(0px);
  }
  .btn{ position: absolute; top: 0; right: -80px; text-align: center; background: #ffcb20; color: #fff; width: 80px}
</style>

</head>
<body>
<header>
  <h2>消息列表</h2>
</header>
<section class="list">
  <ul class="list-ul">
    <li id="li" class="list-li">
      <p class="con">
        你的快递到了，请到楼下签收
      </p>
      <p class="btn">删除</p>
    </li>
    <li class="list-li">
      <p class="con">
        哇，你在干嘛，快点来啊就等你了
      </p>
      <p class="btn">删除</p>
    </li>
  </ul>
</section>

<p>X: <span id="X"></span></p>
<p>objX: <span id="objX"></span></p>
<p>initX: <span id="initX"></span></p>
<p>moveX: <span id="moveX"></span></p>

<script type="text/javascript" src="http://apps.bdimg.com/libs/zepto/1.1.4/zepto.min.js"></script>
<script type="text/javascript" src="zepto.touchWipe.js"></script>
<script type="text/javascript">
  $(function() {
  $(&#39;.list-li&#39;).touchWipe({itemDelete: &#39;.btn&#39;});
  });

</script>
</body>
</html>

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Effect:

Application effect in actual projects:

Eliminate BUG
Going to the above step, we have basically achieved the functions we need. ButThere are several problems:

1. The delete button on the right fails to click because span cannot bubble to the big button;

2 . A very serious problem. We added the touchmove event to p and used preventDefault() to block the original browser event. As a result, the page could not be scrolled when sliding p up or down!

The first problem is easier to solve. We directly remove the span and write "delete" into :before in the css, like this:

.itemWipe .item-delete:before {
  content: &#39;删除&#39;;
  color: #fff;
}

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For the second problem, the Internet says to use iscroll to solve it. Here we refer to the sliding operation of contacts in mobile QQ.

General principle: At the beginning of sliding, determine whether the Y-axis moves more or the X-axis moves more. If the X-axis movement is large, it is judged to be a sliding delete operation, and we then use preventDefault();

The above is the entire content of this article. I hope it will be helpful to everyone's learning. For more related content, please pay attention to PHP Chinese website!

Related recommendations:

JS implements the function of sliding left on the mobile terminal to display the delete button

jQuery and CSS3 imitation Petal Net fixed top position navigation menu with floating effect

The above is the detailed content of js imitates the operation of sliding the contact to the left and sliding out the delete button in QQ. For more information, please follow other related articles on the PHP Chinese website!

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