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JavaScript imitation Weibo publishing information case

高洛峰Original: 2016-12-06 16:11:361359browse

Nowadays, there are many effects similar to posting updates on Weibo. The following is a small case written in JavaScript that is similar to posting information on Weibo

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>微博发布</title>
  <style type="text/css">
 
    *{
      padding: 0;
      margin: 0;
    }
    ul {
 
      list-style: none;
    }
 
    .box {
      width: 600px;
      height: auto;
      border: 1px solid #ccc;
      margin: 100px auto;
      text-align: center;
      padding: 30px 0;
      background-color: rosybrown;
    }
 
    .box textarea {
      width: 450px;
      resize: none; /*设置文本不能过拖动*/
    }
    .box li {
 
      width: 450px;
      line-height: 30px;
      border-bottom: 1px dashed #ccc;
      margin-left: 80px;
      text-align: left;
    }
 
    .box li a {
 
      float: right;
    }
  </style>
 
  <script type="text/javascript">
 
    window.onload = function (){
      //获取数组的第一个
      var btn = document.getElementsByTagName("button")[0];
      var txt = document.getElementsByTagName("textarea")[0];
      var ul = document.createElement("ul");
      btn.parentNode.appendChild(ul); //添加子节点
      btn.onclick = function (){
 
        //1.需要判断文本中是否有内容
        if(txt.value == ""){
 
          alert("亲!内容不能为空哦!!");
 
          return false; //让操作就在这个地方终止
        }
 
        var newli = document.createElement("li"); //创建一个新的li标签
        newli.innerHTML = txt.value +"<a href=&#39;javascript:;&#39;>删除</a>"; //给新的标签添加内容，并拼接删除已连接
        ul.appendChild(newli);
 
        //清空输入框
        txt.value = "";
 
        var aa = document.getElementsByTagName("a");//获取所有的a标签
 
        for(var i = 0;i<aa.length;i++){ // 遍历点击删除
 
          aa[i].onclick = function () {
 
            this.parentNode.remove();
          }
        }
 
 
      }
 
    }
 
  </script>
</head>
<body>
<div class="box">
 
  微博发布:<textarea name="" id="" cols="30" rows="10"></textarea>
  <button>发布</button>
 
</div>
</body>
</html>

The style laid out, click the blue delete link, it will be deleted The corresponding line of content.

JavaScript imitation Weibo publishing information case

Momo said: Important knowledge points: get the value of the input box, create sub-nodes and add content to the sub-nodes, and delete the corresponding nodes.

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