how to validate form in codeigniter - php

Question

I have a website based on codeigniter framework. I have a form on my index page and some prices of flights which are coming through my database.
here is my form:
<?php echo validation_errors(); ?>
<form action="<?php echo base_url() ?>detail/travel" method="post">
<input type="text" name="departure">
<input type="text" name="destination">
<input type="text" name="name">
<input type="text" name="cell">
</form>
so my problem is when user did not fill the whole form and submit the button, it goes into the function of "travel" which I made in my controller(detail) and show 0 results because of the error. I want that user remain on my index page with all the details until he fill the form correctly and show errors on my index page if he missed any field of my form.
here is my function "travel" that i have in my controller(detail):
function search_travel(){
if($_POST){
$config = array(
array(
'field'=>'departure',
'label'=>'departure',
'rules'=>'trim|required|alpha'
),
array(
'field'=>'destination',
'label'=>'destination',
'rules'=>'trim|required|alpha'
),
array(
'field'=>'name',
'label'=>'name',
'rules'=>'trim|required|alpha'
),
array(
'field'=>'cell',
'label'=>'cell no',
'rules'=>'trim|required|regex_match[/^[0-13]+$/]'
)
);
$this->load->library('form_validation');
$this->load->helper(array('form', 'url'));
$this->form_validation->set_rules($config);
if($this->form_validation->run() == FALSE){
$data['errors']= validation_errors();
}
else{
$destination= $this->input->post('destination');
$this->email->send();
$data['var']= $this->Travel->search_travel($destination);
$this->load->view('details',$data)
}
}
}
and my index function is:
function index(){
$data['fares']= $this->Travel->all_fares();
$this->load->view('index', $data);
}

Answer 1

you need to redirect to old page and print error in view page
<?php echo form_error('departure'); ?>
(print this in view for each input fields and below in controller)
if ($this->form_validation->run() == FALSE) {
redirect('method name that loads form');
}