javascript - ajax 使用同一按钮添加和删除

Question

我正在尝试创建一个按钮，单击该按钮时将向该数据库添加一条记录，再次单击该按钮时将从该数据库中删除该记录(这是一个“收藏夹” 按钮)。

我希望它按如下方式工作；

用户点击“fav”按钮 > 按钮状态更改为成功 > 记录已添加

用户再次单击“fav”按钮>状态更改为默认>记录从数据库中删除

到目前为止，我的代码如下(更新代码感谢@Peter)；

books_model.php

class BooksModel
{
 public function checkFav($bookid,$userid)
 {
    $book_id=$_REQUEST['book_id'];
    $user_id=$_SESSION['user_id'];

    $sql = "SELECT * FROM favourite WHERE user_id=? AND book_id=?";
    $query = $this->db->prepare($sql);
    $query->bind_param('ii', $userid,$bookid);
    $query->execute();
    $query->store_result();
    $rows_found = $query->num_rows();
     if(empty($rows_found)) {
        $sql = "INSERT INTO favourite (user_id, book_id)
                VALUES (?, ?)";
        $query = $this->db->prepare($sql);
        $query->bind_param('ii',$userid,$bookid);
        $query->execute();

    } else { 
        $sql = "DELETE FROM favourite WHERE user_id=? AND book_id =?";
        $query = $this->db->prepare($sql);
        $query->bind_param('ii',$userid,$bookid);
        $query->execute();
    }
 }
}

books_controller.php

class Books extends Controller
{
 function checkFav()
 {
    $checkFav_model = $this->loadModel('Books');
 }
}

itemView.php

$(document).ready(function(){
$( "#fav" ).click(function(){  
$( this ).toggleClass( "btn-success" );   
book_id = $(fav).val(); // set the value of the button (book_id)

    $.ajax({
         type: 'POST',
         url: '<?php echo URL; ?>books/checkFav', //location of query
         data: {book_id:book_id}, //taken from value of button

         success: function () { 
             $( "div.addtofavs" ).slideToggle( "slow" ); //show div below button
            }//end success        
        });//end ajax   
    });
});

按钮 html

<button id="fav" value="'.$book->id.'" type="button" class="btn btn-default"></button>

目前，当我单击按钮并在控制台中查看时，我可以看到该帖子，但是没有任何内容发送到我的数据库。

感谢任何建议或指导，因为我对 MVC 和 JS 很陌生。

Answer 1

public function checkFav($bookid,$userid)

{

$sql = "SELECT * FROM favourite WHERE user_id=:userid AND book_id=:bookid";
$query = $this->db->prepare($sql);
$query->bindParam(':userid', $userid);
$query->bindParam(':bookid', $bookid);
$query->execute();
$rows_found = $query->countRows();
 if(empty($rows_found)) {
    $sql = "INSERT INTO favourite (user_id, book_id) VALUES (:userid, :bookid)";
    $query = $this->db->prepare($sql);
    $query->bindParam(':userid', $userid);
    $query->bindParam(':bookid', $bookid);
    $query->execute();

} else { 
    $sql = "DELETE FROM favourite WHERE user_id=:userid AND book_id =:bookid";
    $query = $this->db->prepare($sql);
    $query->bindParam(':userid', $userid);
    $query->bindParam(':bookid', $bookid);
    $query->execute();
}
}
$book_id=$_REQUEST['book_id'];
$user_id=$_SESSION['user_id'];
checkFav($book_id,$user_id);