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Detailed explanation of jQuery operation checkbox steps

php中世界最好的语言Original: 2018-04-19 14:11:151419browse

This time I will bring you a detailed explanation of the steps for operating checkbox with jQuery, and what are the precautions for operating checkbox with jQuery. The following is a practical case, let’s take a look.

Select all, unselect all, and unselect all of the checkboxes group, and obtain the value of the selected checkbox

1. Click the Select All button to select or cancel all check boxes in the group.
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
      */
      $('#checkedAll').click(function() {
        $('[name=item]:checkbox').prop('checked', 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
      */
      $('[name=item]:checkbox').click(function() {
        /*得到的是ul下 name=item 的复选框数组*/
        var $checkedArray = $('[name=item]:checkbox');
        /*$checkedArray.filter(':checked') -----> 已经选择的复选框 */
        $('#checkedAll').prop('checked',$checkedArray.length==$checkedArray.filter(':checked').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
      $('#btn_submit').click(function() {
        checkedArray.length=0;
        count=0;
        $('[name=item]:checkbox:checked').each(function() {
          checkedArray.push($(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>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Detailed explanation of jQuery operation checkbox steps

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