Codeigniter将数据变量从控制器传递到视图

Question

I am using codeigniter framework and on one of the controllers I have tis code below

public function index() {
    $this->data['users'] = $this->user_m->get();
    $this->data['subview'] = 'admin/usuarios/index';
    $this->load->view('admin/layout_principal', $this->data);
}

My problem is when I try to use the data users and subviews into a view. As you can see "subviews" has a location of another view file, and when I call "subviews" in the main view like this:

<div class="span9">
<?php $this->load->view($subview); ?>
</div>

I get this error:

A PHP Error was encountered
Severity: Notice
Message: Undefined variable: subview
Filename: admin/layout_principal.php
Line Number: 19
An Error Was Encountered
Unable to load the requested file: .php*

And I said "well, its just a location I'll put it directly, and go on loading my users data, but then when I use "users" from the data like this:

<?php if(count($users)): foreach($users as $user):?>        
<tr>
<td><?php echo anchor('admin/usuario/editar/' . $user->id, $user->email);?></td>
<td><?php echo btn_edit('admin/usuario/editar', $user->id); ?></td>
<td><?php echo btn_delete('admin/usuario/borrar', $user->id); ?></td>
</tr>
<?php endforeach; ?>
<?php else: ?>
<tr>
<td colspan="3">No users found</td>
</tr>
<?php endif;?>

I get this error:

A PHP Error was encountered
Severity: Notice
Message: Undefined variable: users
Filename: usuario/index.php
Line Number: 15

The view it's not recognizing the data variables, I had searched and tried for ways to solve this but I still with the same problem, and well, I posted this for help as last resource, can you help me? what can I do to make the view recognize the data, because I can't find what's wrong with this.

Answer 1

I can not see that you have loaded the user model

$this->load->model('user_m');

Controller

public function index() {
    $this->load->model('user_m');

    $this->data['users'] = $this->user_m->get();
    $this->data['subview'] = 'admin/usuarios/index';
    $this->load->view('admin/layout_principal', $this->data);
}

Also you need to load view file sub view like so

public function index() {
    $this->load->helper('url'); // Should autoload it.
    $this->load->model('user_m');

    $data['users'] = $this->user_m->get();
    $data['subview'] = $this->load->view('sub_view');

    //if any data in sub view
    //$data['subview'] = $this->load->view('sub_view', $data);

    $this->load->view('admin/layout_principal', $data);
}

If you need to load controller into controller you need HMVC

I also have not heard of <?php echo btn_delete();?> and <?php echo btn_edit();?> http://www.codeigniter.com/userguide2/helpers/url_helper.html

View Try

<?php if(count($users)): foreach($users as $user):?>        
<tr>
<td><?php echo anchor('admin/usuario/editar' .'/'. $user['id']); ?></td>
<td><?php echo anchor('admin/usuario/borrar' .'/'. $user['id']); ?></td>
</tr>
<?php endforeach; ?>
<?php else: ?>
<tr>
<td colspan="3">No users found</td>
</tr>
<?php endif;?>

Answer 2

in your controller function

public function index() {
    $this->data['users'] = $this->user_m->get();
    $this->data['subview'] = 'admin/usuarios/index';
    $this->load->view('admin/layout_principal', $this->data);
}

in your view file:

<div class="span9">
<?php 
 if(isset($subview))
foreach($subview as $subvi)
{
  echo $subvi;
}
 ?>
</div>

for users data in your file as given below:

<?php 
if(count($users)!=0) (OR) if(isset($users))
foreach($users as $user):?>        
<tr>
<td><?php echo anchor('admin/usuario/editar/'.$user->id, $user->email);?>    </td>
<td><?php echo btn_edit('admin/usuario/editar', $user->id); ?></td>
<td><?php echo btn_delete('admin/usuario/borrar', $user->id); ?></td>
</tr>
<?php endforeach; ?>
<?php else: ?>
<tr>
<td colspan="3">No users found</td>
</tr>
<?php endif;?>

Answer 3

Try to use below code in controller(i think you must have loaded the "user_m" model in function __construct(){} ) :

public function index() {
    $data = array();
    $data['users'] = $this->user_m->get();

    $data['subview'] = $this->load->view('admin/usuarios/index', $data, true);
    $this->load->view('admin/layout_principal', $data);
}

And then in view('admin/layout_principal'):

<div class="span9">
<?php echo $subview; ?>
</div>


<?php if(count($users)): foreach($users as $user):?>        
<tr>
<td><?php echo anchor('admin/usuario/editar/' . $user->id, $user->email);?></td>
<td><?php echo btn_edit('admin/usuario/editar', $user->id); ?></td>
<td><?php echo btn_delete('admin/usuario/borrar', $user->id); ?></td>
</tr>
<?php endforeach; ?>
<?php else: ?>
<tr>
<td colspan="3">No users found</td>
</tr>
<?php endif;?>

But try to do all looping and view loading in controller itself... I can explain how ifyou want me to... because view is only for html and php variables.. it should not contain code for loop and load view... but this must part of controller code.. and load in a variable and just echo the variable in the view... must take care of this.. for maintain standard MVC ...