jquery - 使用ajax更新页面数据

Question

如果我点击书籍链接，他会按升序对书进行排序，如果我再次点击，他会按降序对书籍进行排序，但除非我点击下一个或上一个提交，否则他不会执行此操作，为什么他没有更新页面没有点击下一个或上一个？

$(document).ready(function() {
$("#sorter").click(function(e) {
e.preventDefault();
var order_by_value = $('input[name="order_by"]').val();
    $.ajax({
      type: 'GET',
       url: "" + 'http://test.local/UUser.php?action=getBooks',
      data:{
     'order_by_value': order_by_value,

     // button: 'button',
      },
      success: function (res) {
        console.log(res);
        if(order_by_value == "ASC"){
       $('input[name="order_by"]').val("DESC");
      }
      else {
       $('input[name="order_by"]').val("ASC");
       }
     // $('input[name="current"]').trigger('click');
    }
   });
});
});

这是我的功能

public function getBooks($start = 0, $limit = 2, $order = "ASC")
 {
   $sql_start = $start * $limit;
   $sql_limit = $limit;
   $sql_order_by = $order;

   $query = "SELECT Library.nameOfBook, userBook.book_id, userBook.user_id FROM loginUser JOIN userBook JOIN Library ON userBook.user_id = loginUser.id AND userBook.book_id = Library.id WHERE loginUser.username=:username ORDER BY Library.nameOfBook $sql_order_by LIMIT $sql_start, $sql_limit";
   $statment = $this->db->prepare($query);
   $statment->execute([
       ':username' => $this->username
   ]);
   $result = $statment->fetchAll();

  echo "<table id='myTable' border='1'>

  <tr>
   <th><a id='sorter' href='#'>Books</a></th>
   <th>Action</th>
   </tr>";
   foreach($result as $row){
       echo "<tr>";
       echo "<td>" . $row['nameOfBook'] . "</td>";
       echo "<td>" ."<input type='submit' id='delete".$row['book_id']."-".$row['user_id']."' onclick='deleteBook(this)' name='delete' value='Delete'>" . "</td>";
       echo "</tr>";
   }

   echo "</table>";
   echo "";
   return count($result);

 }

Answer 1

此事件正在监听具有 Id 排序器的元素，因此它工作正常，您只需将服务器的答案显示到客户端即可

success: function (res) {
        console.log(res);
        if(order_by_value == "ASC"){
       $('input[name="order_by"]').val("DESC");
      }
      else {
       $('input[name="order_by"]').val("ASC");
       }
     // $('input[name="current"]').trigger('click');
     //here you display the result from the server
    $("#myTable").html(res);
    }