第126天：移动端-原生实现响应式模态框

时间：2017-12-26 23:52:17 阅读：451 评论：0 收藏：0 [点我收藏+]

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下面采用HTML+CSS+JavaScript实现模态框，并采用Flex布局和多媒体查询实现响应式。

一、模态框HTML代码

 1 <!DOCTYPE html>  
 2 <html lang="en">  
 3 <head>  
 4     <meta charset="UTF-8">  
 5     <title>模态框实现</title>  
 6     <link rel="stylesheet" href="css\modal.css" type="text/css">  
 7 </head>  
 8 <body>  
 9 <button class="btn" id="showModel">模态框展示</button>  
10 <div id="modal" class="modal">  
11     <div class="modal-content">  
12         <header class="modal-header">  
13             <h4>模态框标题</h4>  
14             <span class="close">×</span>  
15         </header>  
16         <div class="modal-body">  
17             <p>HTML+CSS+JS原生实现响应式模态框演示！</p>  
18         </div>  
19         <footer class="modal-footer">  
20             <button id="cancel">取消</button>  
21             <button id="sure">确定</button>  
22         </footer>  
23     </div>  
24 </div>  
25 </body>  
26 </html>

首先定义模态框的overlayer，然后定义模态框的内容包括header（带关闭按钮）、body和footer。

二、模态框CSS代码

  1 h4{  
  2     margin-left: 20px;  
  3 }  
  4 p{  
  5     text-align: center;  
  6 }  
  7 .btn{  
  8     width: 100px;  
  9     height: 35px;  
 10     border-radius: 5px;  
 11     font-size: 16px;  
 12     color: white;  
 13     background-color: cornflowerblue;  
 14 }  
 15 .btn:hover, .btn:focus{  
 16     background-color: #95b4ed;  
 17 }  
 18 .modal{  
 19     display: none;  
 20     width: 100%;  
 21     height: 100%;  
 22     position: fixed;  
 23     left: 0;  
 24     top: 0;  
 25     z-index: 1000;  
 26     background-color: rgba(0,0,0,0.5);  
 27 }  
 28 .modal-content{  
 29     display: flex;  
 30     flex-flow: column nowrap;  
 31     justify-content: space-between;  
 32     width: 50%;  
 33     max-width: 700px;  
 34     height: 40%;  
 35     max-height: 500px;  
 36     margin: 100px auto;  
 37     border-radius:10px;  
 38     background-color:#fff;  
 39     -webkit-animation: zoom 0.6s;  
 40     animation: zoom 0.6s;  
 41     resize: both;  
 42     overflow: auto;  
 43 }  
 44 @-webkit-keyframes zoom{  
 45     from {-webkit-transform: scale(0)}  
 46     to {-webkit-transform: scale(1)}  
 47 }  
 48 @keyframes zoom{  
 49     from {transform: scale(0)}  
 50     to {transform: scale(1)}  
 51 }  
 52 .modal-header{  
 53     box-sizing:border-box;  
 54     border-bottom:1px solid #ccc;  
 55     display: flex;  
 56     justify-content: space-between;  
 57     align-items: center;  
 58 }  
 59 .close{  
 60     color: #b7b7b7;  
 61     font-size: 30px;  
 62     font-weight: bold;  
 63     margin-right: 20px;  
 64     transition: all 0.3s;  
 65 }  
 66 .close:hover, .close:focus{  
 67     color: #95b4ed;  
 68     text-decoration: none;  
 69     cursor: pointer;  
 70 }  
 71 .modal-body{  
 72     padding: 10px;  
 73     font-size: 16px;  
 74     box-sizing:border-box;  
 75 }  
 76 .modal-footer{  
 77     box-sizing:border-box;  
 78     border-top:1px solid #ccc;  
 79     display: flex;  
 80     padding: 15px;  
 81     justify-content: flex-end;  
 82     align-items: center;  
 83 }  
 84 .modal-footer button{  
 85     width: 60px;  
 86     height: 35px;  
 87     padding: 5px;  
 88     box-sizing: border-box;  
 89     margin-right: 10px;  
 90     font-size: 16px;  
 91     color: white;  
 92     border-radius: 5px;  
 93     background-color: cornflowerblue;  
 94 }  
 95 .modal-footer button:hover, .modal-footer button:focus{  
 96     background-color: #95b4ed;  
 97     cursor: pointer;  
 98 }  
 99 @media only screen and (max-width: 700px){  
100     .modal-content {  
101         width: 80%;  
102     }  
103 }

模态框model默认不显示（display：none），且固定占满整个屏幕，覆盖其它内容（z-index），蒙层背景颜色为黑色半透明；

模态框的显示通过animateion动画逐渐放大显示出来；

模态框响应式布局，首先设置整个模态框为flex容器，flex项目为header、body和footer，且主轴为纵向。header和footer模块又可用flex布局，flex容器为header和footer，flex项目为内部元素，主轴为水平方向。

多媒体media查询实现当屏幕小到一定程度时，模态框大小比例可适当放大。

三、模态框JavaScript代码

 1 <script>  
 2     var btn = document.getElementById(‘showModel‘);  
 3     var close = document.getElementsByClassName(‘close‘)[0];  
 4     var cancel = document.getElementById(‘cancel‘);  
 5     var modal = document.getElementById(‘modal‘);  
 6     btn.addEventListener(‘click‘, function(){  
 7         modal.style.display = "block";  
 8     });  
 9     close.addEventListener(‘click‘, function(){  
10         modal.style.display = "none";  
11     });  
12     cancel.addEventListener(‘click‘, function(){  
13         modal.style.display = "none";  
14     });  
15 </script>