Codeigniter form validation error message - php

Question

I have a form on my website header where i allow the user to log in with his username/password... then i POST to /signin page and check if the username exists to allow the user to log in.. if there is a problem upon login i output these errors...
i tried using the following code to show a custom error but with no luck
if ($this->form_validation->run() == false){
$this->load->view("login/index", $data);
}else{
$return = $this->_submitLogin();
if ($return == true){
//success
}else{
$this->form_validation->set_message('new_error', 'error goes here');
//error
}
$this->load->view("login/index", $data);
}
how does set_message work and if this is the wrong method, which one allow me to show a custom error in this case?
EDIT :
validation rules:
private $validation_rules = array(
array(
'field' => 'username',
'label' => 'Username',
'rules' => 'trim|required|callback__check_valid_username|min_length[6]|max_length[20]|xss_clean'
),
array(
'field' => 'password',
'label' => 'Password',
'rules' => 'trim|required|min_length[6]|max_length[32]'
),
);

Answer 1

The set_message method allows you to set your own error messages on the fly. But one thing you should notice is that the key name has to match the function name that it corresponds to.
If you need to modify your custom rule, which is _check_valid_username, you can do so by perform set_message within this function:
function _check_valid_username($str)
{
// Your validation code
// ...
// Put this in condition where you want to return FALSE
$this->form_validation->set_message('_check_valid_username', 'Error Message');
//
}
If you want to change the default error message for a specific rule, you can do so by invoking set_message with the first parameter as the rule name and the second parameter as your custom error. E.g., if you want to change the required error :
$this->form_validation->set_message('required', 'Oops this %s is required');
If by any chance you need to change the language instead of the error statement itself, create your own form_validation_lang.php and put it into the proper language folder inside your system language directory.

Answer 2

As you can see here, you can display the custom error in your view in the following way:
<?php echo form_error('new_error'); ?>
PS: If this isn't your problem, post your corresponding view code and any other error message that you're getting.

Answer 3

The problem is that your form is already validated in your IF part! You can fix the problem by this way:
if ($this->form_validation->run() == false){
$this->load->view("login/index", $data);
}else{
$return = $this->_submitLogin();
if ($return == true){
//success
}else{
$data['error'] = 'Your error message here';
//error
}
$this->load->view("login/index", $data);
}
In the view:
echo $error;
The CI way to check user credentials is to use callbacks:
$this->form_validation->set_rules('username', 'Username', 'callback_username_check');
...
public function username_check($str) {
// your code here
}
I recommend you to read CI documentation: http://codeigniter.com/user_guide/libraries/form_validation.html

Answer 4

The way I did this was to add another validation rule and run the validation again. That way, I could keep the validation error display in the view consistent.
The following code is an edited excerpt from my working code.
public function login() {
$this->form_validation->set_rules('email', 'Email', 'required');
$this->form_validation->set_rules('password', 'Password', 'required');
$data['content'] = 'login';
if($this->form_validation->run()) {
$sql = "select * from users where email = ? and password = ?";
$query = $this->db->query($sql, array($this->input->post('email'), $this->input->post('password')));
if($query->num_rows()==0) {
// user not found
$this->form_validation->set_rules('account', 'Account', 'callback__noaccount');
$this->form_validation->run();
$this->load->view('template', $data);
} else {
$this->session->set_userdata('userid', $query->id);
redirect('/home');
}
} else {
$this->load->view('template', $data);
}
}
public function _noaccount() {
$this->form_validation->set_message('_noaccount', 'Account must exist');
return FALSE;
}

Answer 5

Require Codeigniter 3.0
Using callback_ method;
class My_controller extends CI_Controller {
function __construct() {
parent::__construct();
$this->form_validation->set_message('date_control', '%s Date Special Error');
}
public function date_control($val, $field) { // for special validate
if (preg_match("/^[0-9]{2}.[0-9]{2}.[0-9]{4}$/", $val)) {
return true;
} else {
return false;
}
}
public function my_controller_test() {
if ($this->input->post()) {
$this->form_validation->set_rules('date_field', 'Date Field', 'trim|callback_date_control[date_field]|xss_clean');
if ($this->form_validation->run() == FALSE) {
$data['errors']=validation_errors();
$this->load->view('my_view',$data);
}
}
}
}
Result:
if date = '14.07.2017' no error
if date = '14-7-2017' Date Field Date Special Error