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jQuery implements simple operation of checkbox

韦小宝Original: 2018-01-16 11:11:381016browse

This article mainly introduces the simple operation of jQuery to implement checkbox. It has certain reference and learning for selecting all, not selecting all, and not selecting all of the checkbox group. The value of jquery. Friends who are interested in jquery can refer to this article

Select all, unselect all, and select none of the check box group, and obtain the value of the selected check box

1. Click the Select All button to select all the check box groups or cancel them all.
2. Realize the linkage between the select all button and the check box group. When one of the check box groups is not selected, the select all button with id='checkedAll' should be unchecked; when the check box group Once all are selected, the Select All button should also be selected.
3. Get the value of the selected check box.

Code:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>对复选框组的全选操作</title>
  <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js" type="text/javascript"></script>
  <script type="text/javascript">
    $(function(){
      /*全选
      全选cheched和下方的checkbox按钮的checked是一致的，
      故可用this.checked。
      注意：$(this).checked是错的
      */
      $(&#39;#checkedAll&#39;).click(function() {
        $(&#39;[name=item]:checkbox&#39;).prop(&#39;checked&#39;, this.checked);
      });

      /*判断复选框的总数，是否和选中的复选框的数量相等
      相等：全选了
      不相等：没有全选
      */
      $(&#39;[name=item]:checkbox&#39;).click(function() {
        /*得到的是ul下 name=item 的复选框数组*/
        var $checkedArray = $(&#39;[name=item]:checkbox&#39;);
        /*$checkedArray.filter(&#39;:checked&#39;) -----> 已经选择的复选框 */
        $(&#39;#checkedAll&#39;).prop(&#39;checked&#39;,$checkedArray.length==$checkedArray.filter(&#39;:checked&#39;).length);
　　　　　　　　　　　　
      });
    });
  </script>
  <script type="text/javascript">
    $(function () {
      //获取已选的复选框的值
      var checkedArray = new Array();//放已经选择的checkbox的value
      var count;//已经选择的个数
      $(&#39;#btn_submit&#39;).click(function() {
        checkedArray.length=0;
        count=0;
        $(&#39;[name=item]:checkbox:checked&#39;).each(function() {
          checkedArray.push($(this).val());
          count++;
        });
        if (checkedArray.length==0) {
          alert("Please check one at least.");
          return;
        }
        confirm("已选复选框的值："+checkedArray+"\n"+"选中的复选框个数："+count);
      });
    })
  </script>
</head>
<body>
  <form action="#" method="POST">
    <input type="checkbox" id="checkedAll"><label for="checkedAll">全选</label>
    <ul>
      <li><input type="checkbox" name="item" value="basketball">篮球</li>
      <li><input type="checkbox" name="item" value="football">足球</li>
      <li><input type="checkbox" name="item" value="badminton">羽毛球</li>
      <li><input type="checkbox" name="item" value="pingpong">兵乓球</li>
      <li><input type="checkbox" name="item" value="swimming">游泳</li>
      <li><input type="checkbox" name="item" value="running">跑步</li>
    </ul>
    <button type="button" id="btn_submit" value="提交button">提交</button>
  </form>
</body>
</html>

Regarding the deficiencies in the code and the areas that are not concise enough, they can be further optimized. If you have any better ideas and implementation methods, you are welcome to exchange and learn together.

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