Error message not displaying in CodeIgniter - php

Question

I want to edit some data after a POST in CodeIgniter.
The problem is when I make an edit I want to show a message that tells me the edit is done. I tried to do the following, but no message is displayed. Why?
Controller
function edit($id = 0) {
$this->load->model('Event_Model');
if ($id > 0) {
$this->data['eventinfo'] = $this->Event_Model->getInfo($id);
}
$this->data['pagetitle'] = "Edit";
$this->data['formID'] = $this->uri->segment(2)."-".$this->uri->segment(3);
$this->template->build('admin/events/add',$this->data);
}
function do_edit() {
$this->load->model('Event_Model');
$id = $this->input->post('hID');
$data = array(
'ev_text' => $this->input->post('ev_text'),
'ev_pic' => $this->input->post('ev_pic'),
);
$this->Event_Model->update($id, $data);
$this->data['success'] = "Done";
$this->data['errors'] = $this->errors;
$this->template->build('admin/events/add',$this->data);
}
Model
function update($id, $data) {
$this->db->where('ev_id', $id);
$this->db->update('events', $data);
}
View (where I want the message)
<?php
if (isset($success)) { ?>
<div class="alert alert-success normal-alert" style="display: block;">
<p><span class="ico-text ico-alert-success" ></span><?= $success; ?></p>
</div>
<?php
}
if (isset($errors)) { ?>
<div class="alert alert-error normal-alert" style="display: block;">
<div>
<span class="ico-text ico-alert-error"></span>
<?php if (count($errors) > 0) { ?>
<ul>
<?php
foreach ($errors as $error) {
echo "<li>$error</li>";
}
?>
</ul>
<?php } ?>
<div class="clear"></div>
</div>
</div>
<?php } ?>
and the second error, update data with picture not work, its get me error in dubg that call me the $_FILES['choose-file']['name'] not define

Answer 1

Try This:
Controller
function do_edit() {
$this->load->model('Event_Model');
$id = $this->input->post('hID');
$data = array(
'ev_text' => $this->input->post('ev_text'),
'ev_pic' => $this->input->post('ev_pic'),
);
$result = $this->Event_Model->update($id, $data);
if($result) {
$this->data['success'] = "Done";
$this->template->build('admin/events/add',$this->data);
}
$this->data['errors'] = $this->errors;
$this->template->build('admin/events/add',$this->data);
}
Model:
function update($id, $data) {
$this->db->where('ev_id', $id);
$this->db->update('events', $data);
return $this->db->affected_rows();
}