基于javascript制作微信聊天面板

2016-03-17 网页编程网 网页编程网

点击头像更换说话对象，简单说下实现原理，html中创建一个ul用于存放所有说话的内容，对话内容是有javascript 动态生成，主要难点：先布局好css，当时用户发送时候，让这个li有浮动，当是其他用户时候，让这个li左浮动。

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>模拟短信发送</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      list-style: none;
      font-family: '微软雅黑'
    }
    #container {
      width: 450px;
      height: 780px;
      background: #eee;
      margin: 80px auto 0;
      position: relative;
      box-shadow: 20px 20px 55px #777;
    }
    .header {
      background: #000;
      height: 34px;
      color: #fff;
      line-height: 34px;
      font-size: 20px;
      padding: 0 10px;
    }
    .footer {
      width: 430px;
      height: 50px;
      background: #666;
      position: absolute;
      bottom: 0;
      padding: 10px;
    }
    .footer input {
      width: 275px;
      height: 45px;
      outline: none;
      font-size: 20px;
      text-indent: 10px;
      position: absolute;
      border-radius: 6px;
      right: 80px;
    }
    .footer span {
      display: inline-block;
      width: 62px;
      height: 48px;
      background: #ccc;
      font-weight: 900;
      line-height: 45px;
      cursor: pointer;
      text-align: center;
      position: absolute;
      right: 10px;
      border-radius: 6px;
    }
    .footer span:hover {
      color: #fff;
      background: #999;
    }
    #icon {
      display: inline-block;
      background: red;
      width: 60px;
      height: 60px;
      border-radius: 30px;
      position: absolute;
      bottom: 6px;
      left: 14px;
      cursor: pointer;
      overflow: hidden;
    }
    img {
      width: 60px;
      height: 60px;
    }
    .content {
      font-size: 20px;
      width: 435px;
      height: 662px;
      overflow: auto;
      padding: 5px;
    }
    .content li {
      margin-top: 10px;
      padding-left: 10px;
      width: 412px;
      display: block;
      clear: both;
      overflow: hidden;
    }
    .content li img {
      float: left;
    }
    .content li span{
      background: #7cfc00;
      padding: 10px;
      border-radius: 10px;
      float: left;
      margin: 6px 10px 0 10px;
      max-width: 310px;
      border: 1px solid #ccc;
      box-shadow: 0 0 3px #ccc;
    }
    .content li img.imgleft { 
      float: left; 
    }
    .content li img.imgright { 
      float: right; 
    }
    .content li span.spanleft { 
      float: left;
      background: #fff;
    }
    .content li span.spanright { 
      float: right;
      background: #7cfc00;
    }
  </style>
  <script>
    window.onload = function(){
      var arrIcon = ['img/1.jpg','img/2.jpg'];
      var num = 0;   //控制头像改变
      var iNow = -1;  //用来累加改变左右浮动
      var icon = document.getElementById('icon').getElementsByTagName('img');
      var btn = document.getElementById('btn');
      var text = document.getElementById('text');
      var content = document.getElementsByTagName('ul')[0];
      var img = content.getElementsByTagName('img');
      var span = content.getElementsByTagName('span');
 
      icon[0].onclick = function(){
        if(num==0){
          this.src = arrIcon[1];
          num = 1;
        }else if(num==1){
          this.src = arrIcon[0];
          num = 0;
        }        
      }
      btn.onclick = function(){
        if(text.value ==''){
          alert('发送内容不能为空');
        }else {
          content.innerHTML += '<li><img src="'+arrIcon[num]+'"><span>'+text.value+'</span></li>';
          iNow++;
          if(num==0){
            img[iNow].className += 'imgright';
            span[iNow].className += 'spanright';
          }else {
            img[iNow].className += 'imgleft';
            span[iNow].className += 'spanleft';
          }
          text.value = '';
        }
      }
    }
  </script>
</head>
<body>
  <div id="container">
    <div class="header">
      <span style="float: left;">网页编程网</span>
      <span style="float: right;">20:30</span>
    </div>
    <ul class="content"></ul>
    <div class="footer">
      <div id="icon">
        <img src="img/1.jpg" alt="">
      </div>
      <input id="text" type="text" placeholder="说点什么吧...">
      <span id="btn">发送</span>
    </div>
  </div>
</body></html>

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