CodeIgniter on/off form_checkbox() button not sending $_POST data

I'd like some help please. I have this form group: This is the view:

<?php echo form_open('admin/posts/post/'.$post->id); ?>
// other fields here...
<div class="form-group">
                <label for="" class="col-sm-2">Visible</label>

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

// more fields ...
<?php echo form_close(); ?>

This is the controller

public function post($id){
        $this->data['post'] = $this->post_model->get($id);

        $this->form_validation->set_rules($this->post_model->rules);
        if ($this->form_validation->run() === true) {

              var_dump($this->input->post('visible')); //not getting anything from the visible field

             // store data in database and redirect
             $this->post_model->save($id);
        }

        // load the view
        $this->load->view('admin/post/edit');
    }

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

Any ideas what wrong and how should fix it??

This has nothing to do with Codeigniter, it's just how browsers work, if a checkbox is unchecked no POST data is sent to the server.

So you can either check in the controller for $this->input->post('visible') (it will return false if the checkbox is unchecheck and whatever you have in value.

Or you can do a small hack and put an hidden input with the same name and the value as false before you checkbox.

In your example you should put value="1" on the checkbox and have a <?=form_hidden('visible', 0)?> before the checkbox.