CakePHP AJAX删除与J查询

Question

i've found this http://www.jamesfairhurst.co.uk/posts/view/ajax_delete_with_cakephp_and_jquery/ tutorial on the web, but it was for cakephp 1.3.

After making some adjustements to it , i try to run it, but something is going wrong. While the record gets deleted(as it should be), it refreshed the page. It's like Ajax and Jquery are not working. Below is my code

The Controller Action

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'));
}

The View

    <?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>

The 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;
    });
}
});

Please take in mind that i'm very new to all this Jquery and Ajax thing, as well as in cakephp.

What is causing that behaviour ? (also if i try to remove the redire from the controller, i get a message that "view delete was not found" )

Answer 1

First of all check cookbook for HtmlHelper::link and JsHelper::link . Not sure what version of cake you have, so just switch to the right one. The thing is - none of your Delete links has class confirm_delete (use firebug or some debugging tool) - so the link gets clicked but the javascript is never executed, that's why you get redirected. In your case it would be:

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

and

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

Then I see $('.ajax_loader').hide(); but in your view is element with id="ajax_loader" , so the selector should be $('#ajax_loader').hide(); Same with $('#ajax_msg').html( , double check you have that element on page with the id="ajax_msg" Hope it helps you further;)