用jQuery方法表格全选案例

html文件：

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>表格全选案例</title>
  <style>
    * {
      padding: 0;
      margin: 0;
    }
    
    .wrap {
      width: 300px;
      margin: 100px auto 0;
    }
    
    table {
      border-collapse: collapse;
      border-spacing: 0;
      border: 1px solid #c0c0c0;
      width: 300px;
    }
    
    th,
    td {
      border: 1px solid #d0d0d0;
      color: #404060;
      padding: 10px;
    }
    
    th {
      background-color: #09c;
      font: bold 16px "微软雅黑";
      color: #fff;
    }
    
    td {
      font: 14px "微软雅黑";
    }
    
    tbody tr {
      background-color: #f0f0f0;
      text-align: center;
    }
    
    tbody tr:hover {
      cursor: pointer;
      background-color: #fafafa;
    }
  </style>
</head>
<body>
<div class="wrap">
  <table>
    <thead>
    <tr>
      <th>
        <input type="checkbox" id="j_cbAll"/>
      </th>
      <th>菜名</th>
      <th>饭店</th>
    </tr>
    </thead>
    <tbody id="j_tb">
    <tr>
      <td>
        <input type="checkbox"/>
      </td>
      <td>红烧肉</td>
      <td>田老师</td>
    </tr>
    <tr>
      <td>
        <input type="checkbox"/>
      </td>
      <td>西红柿鸡蛋</td>
      <td>田老师</td>
    </tr>
    <tr>
      <td>
        <input type="checkbox"/>
      </td>
      <td>红烧狮子头</td>
      <td>田老师</td>
    </tr>
    <tr>
      <td>
        <input type="checkbox"/>
      </td>
      <td>日式肥牛</td>
      <td>田老师</td>
    </tr>
    </tbody>
  </table>
</div>
<script src="jquery-1.12.4.js"></script>
<script>
    $(function(){
      $("#j_cbAll").click(function(){
        //修改下面的哪些checkbox
        $("#j_tb input").prop("checked",$(this).prop("checked"));
      });
      $("#j_tb input").click(function(){
        //下面所有的input中被选中的哪些input
        var allLength = $("#j_tb input").length;
        var checkedLength = $("#j_tb input:checked").length;
        if (allLength == checkedLength) {
          //说明可以全选了
          $("#j_cbAll").prop("checked",true);
        }else{
          $("#j_cbAll").prop("checked",false);
        }
      });
    });
</script>
</body>
</html>

　　

 

posted @ 2020-04-17 23:32  迷幻天空岛  阅读(322)  评论(0)    收藏  举报