Codeigniter avoid re-submitting the form data - php

Question

I am working with Codeigniter. I have a controller with the method named login which takes the form data and checks if user exists?, upon success it loads another view. But when I click the refresh button in my browser the method in my controller re-executes, I want to prevent the re-submission of form data. Kindly Help me. Also please suggest me how it should behave normally,whether it should just prevent the re-submission of form and stay insane or should it redirect to login screen.
here is the code :
Login Controller
<?php
class Login extends CI_Controller {
/**
*
* load the Models
*/
function __construct() {
parent::__construct();
$this->load->library('form_validation');
$this->load->model('User');
// $this->session->set_flashdata('success','data posted');
$this->load->library('session');
$this->load->helper('url');
}
public function index() {
$this->load->view('login');
}
/**
*
* Log in a user
*/
public function login() {
$this->form_validation->set_rules(array(
array(
'field' => 'username',
'label' => 'username',
'rules' => 'required|is_numeric|max_length[1]|min_length[1]',
),
array(
'field' => 'password',
'label' => 'password',
'rules' => 'required|is_numeric|max_length[1]|min_length[1]',
),
));
$this->form_validation->set_error_delimiters('<div class="alert alert-error">', '</div>');
//GETTING ID AND PASSWORD FROM THE FORM
$id = $this->input->post('username') . "<br>";
$password = $this->input->post('password') . "<br>";
//check if user exists
$user = new User();
$user_exists = $user->user_exists($id, $password);
//validate the user input
$validated = $this->form_validation->run();
if (!$validated) {
$this->load->view('login');
} else {
if ($user_exists) {
//use php function to pickup the current year from the pc
//set your min to 01-01-current year and your max to 31-12-current year
$min = strtotime(date('Y') . "-01-01");
$max = strtotime(date('Y') . "-12-31");
$date = rand($min, $max);
$dec2 = strtotime('2014-12-02');
$randomDate = date('Y-m-d', $date);
echo "random date:" . $randomDate . "<br>";
$date_timestamp = strtotime($randomDate);
if ($date_timestamp >= $dec2) {
$is_updated = $user->is_holiday_updated();
if (!$is_updated) {
// $user->update_national_holidays();
echo "holiday table updated";
} else {
echo "already updated the table";
}
} else {
echo "no update required";
}
$this->load->view('national_holiday_screen');
} else {
$this->load->view('login');
}
}
}
}
here is the View:
<h2> National Holiday Screen </h2>

Answer 1

You have to do like the following steps
in your model You have to create Method to check the username and password and in my example i will call that method Valid($username,$password);
this method will return true if matching db and false if not .
in your controller .
public function login()
{
// check if button is clicked by
if(isset($_POST['loginButton'])){
// check if username and password is correct
if($model->valid($this->input>post('username'),$this->input>post('password')){
//redirect to admin page
}else{
//load login form template
}
}else{
// load your login form template here
}
}
well , the main point here is that , to remove the post submitting from browser you have to redirect the user to another page as above example .
Note : your issue is with if statement you are displaying the template at end of the controller , you have to display the template base on if statement .