Not getting the value from the on/off switch checkbox

[eluser]Lykos22[/eluser]
Hi, I'd like some help please. I have this form group: This is the view:

Code:

<?php echo form_open('admin/posts/post/'.$post->id); ?>
// other fields here...

<div class="form-group">
                <label for="visible" class="col-sm-2">Visible</label>
                <div class="col-sm-10">
                    <div class="onoffswitch">
                        &lt;?php  
                            $is_checked = ($post->visible) ? $post->visible : $this->input->post('visible');
                            $visible = array(
                                'class' => 'onoffswitch-checkbox',
                                'id' => 'visible',
                                'checked' => ($is_checked == '1') ? true : false,
                                'name' => 'visible',
                                'value' => $is_checked,
                                );
                        ?&gt;
                        &lt;?php echo form_checkbox($visible); ?&gt;
                        <label class="onoffswitch-label" for="visible">
                            <div class="onoffswitch-inner"></div>
                            <div class="onoffswitch-switch"></div>
                        </label>
                    </div>
                </div>
            </div>


// more fields here ...
&lt;?php echo form_close(); ?&gt;

Basicly this works as an on/off switch button. The problem is that when I click the submit button of the form, I cannot get the $_POST data of the field ( $this->input->post('visible') ) in order to pass it to my model and store it in the database.

Any ideas what I'm doing wrong and how should fix it?