Cakephp ajax 使用 j 查询删除

Question

我发现了这个 http://www.jamesfairhurst.co.uk/posts/view /ajax_delete_with_cakephp_and_jquery/ 网上教程，但适用于 cakephp 1.3。

对它进行一些调整后，我尝试运行它，但出了问题。当记录被删除时（理应如此），它刷新了页面。就像 Ajax 和 Jquery 不起作用一样。 下面是我的代码

控制器操作

function delete($id=null) {
    // set default class & message for setFlash
    $class = 'flash_failure';
    $msg   = 'Invalid User Id';

    // check id is valid
    if($id!=null && is_numeric($id)) {
        // get the Item
        $item = $this->User->read(null,$id);

        // check Item is valid
        if(!empty($item)) {
            $user = $this->Session->read('Auth.User');
           // $exists=$this->User->find('count',array('conditions'=>array("User.username" => $user)));
            if($item['User']['username']==$user['username']){
                $msg = 'You cannot delete yourself!';
            }

            // try deleting the item
            else if($this->User->delete($id)) {
                $class = 'flash_success';
                $msg   = 'User was successfully deleted';
            } else {
                $msg = 'There was a problem deleting User, please try again';
            }
        }
    }

    // output JSON on AJAX request
    if(/*$this->RequestHandler->isAjax()*/$this->request->is('ajax')) {
        $this->autoRender = $this->layout = false;
        echo json_encode(array('success'=>($class=='flash_failure') ? FALSE : TRUE,'msg'=>"<p id='flashMessage' class='{$class}'>{$msg}</p>"));
        exit;
    }

    // set flash message & redirect
    $this->Session->setFlash($msg,$class,array('class'=>$class));
    $this->redirect(array('action'=>'manage'));
}

视图

    <?php //view/users/manage.ctp ?>
<h1 class="ico_mug">Users</h1>
    <?php echo 'Add User '.$this->Html->link($this->Html->image("add.jpg"), array('action' => 'register'), array('escape' => false));//print_r ($users); ?>
</br>
<table id="table">
    <tr>

        <th>ID</th>
        <th>Username</th>
        <th>Last Login</th>
        <th>Options</th>

    </tr>

    <!-- Here is where we loop through our $posts array, printing out post info -->

    <?php foreach ($users as $rs): ?>
    <tr>
       <?php echo $this->Html->script('jquery'); ?>
        <td class="record">
            <?php echo $rs['User']['id']; ?>
        </td>
        <td class="record"><?php echo $rs['User']['username']; ?></td>
        <td class="record"><?php if(!$rs['User']['last_login']) {echo "Never Logged In";} else {echo $rs['User']['last_login'];} ?></td>
        <td class="record"> <?php echo $this->Html->link($this->Html->image("edit.jpg"), array('action' => 'edit',$rs['User']['id']), array('escape' => false));?>
            <?php
                $user = $this->Session->read('Auth.User');
                if($rs['User']['username']!=$user['username'])
                echo $this->Html->link($this->Html->image("cancel.jpg"), array('action' => 'delete',$rs['User']['id']), array('escape' => false),array('class'=>'confirm_delete'));?>
            <?php
            if($rs['User']['username']!=$user['username'])
            // simple HTML link with a class of 'confirm_delete'
            echo $this->Js->link('Delete',array('action'=>'delete',$rs['User']['id']),array('escape' => false),array('class'=>'confirm_delete'));
            ?></td>
    </tr>
    <?php endforeach; ?>

    <div class="paging">
        <?php echo $this->Paginator->prev('<< ' . __('previous'), array(), null, array('class'=>'disabled'));?>
        |  <?php echo $this->Paginator->numbers();?>
        |  <?php echo $this->Paginator->next(__('next') . ' >>', array(), null, array('class' => 'disabled'));?>
    </div>

</table>
    <div id='ajax_loader'></div>

Jquery

// on dom ready
$(document).ready(function(){
// class exists
if($('.confirm_delete').length) {
        // add click handler
    $('.confirm_delete').click(function(){
        // ask for confirmation
        var result = confirm('Are you sure you want to delete this?');

        // show loading image
        $('.ajax_loader').show();
        $('#flashMessage').fadeOut();

        // get parent row
        var row = $(this).parents('tr');

        // do ajax request
        if(result) {
            $.ajax({
                type:"POST",
                url:$(this).attr('href'),
                data:"ajax=1",
                dataType: "json",
                success:function(response){
                    // hide loading image
                    $('.ajax_loader').hide();

                    // hide table row on success
                    if(response.success == true) {
                        row.fadeOut();
                    }

                    // show respsonse message
                    if( response.msg ) {
                        $('#ajax_msg').html( response.msg ).show();
                    } else {
                        $('#ajax_msg').html( "<p id='flashMessage' class='flash_bad'>An unexpected error has occured, please refresh and try again</p>" ).show();
                    }
                }
            });
        }
    return false;
    });
}
});

请记住，我对所有这些 Jquery 和 Ajax 以及 cakephp 都非常陌生。

是什么导致了这种行为？ （此外，如果我尝试从控制器中删除重设，我会收到一条消息“未找到视图删除”）

Answer 1

首先检查食谱 HtmlHelper::链接和JsHelper::link。不确定你的蛋糕是什么版本，所以只需切换到正确的版本即可。
问题是 - 你的 Delete 链接都没有类 confirm_delete （使用 firebug 或一些调试工具） - 所以链接被点击但 JavaScript 从未被执行，这就是为什么你被重定向。
在你的情况下，它是：

echo $this->Html->link($this->Html->image('cancel.png'), array('controller' => 'users', 'action' => 'delete', $rs['User']['id']), array('escape'=>false, 'class'=>'confirm_delete') );

然后

echo $this->Js->link('Delete', array('controller' => 'users', 'action'=>'delete', $rs['User']['id']), array('escape' => false, 'class'=>'confirm_delete'));

我看到 $('.ajax_loader').hide(); 但在你看来是带有 id="ajax_loader" 的元素，所以选择器应该是 $('#ajax_loader').hide();
与 $('#ajax_msg').html( 相同，请仔细检查页面上是否有该元素，其中 id="ajax_msg"
希望它能进一步帮助您；）