codeigniter login validation not validating rules - validation

Question

am using codeigniter 3.0.4 .here this Here the action send to the controler(first.php)not validating anything it will turn to else statement and display login page again(as set as in redirect('welcome/login_page');). my register function in the same controller working good. what is the exact problem ..please help me to find it.thanks.
..............the controller(first.php).....
public function signup_validation(){
$this->load->library('form_validation');
$this->form_validation->set_rules('email', 'Email', 'required|trim|xss_clean|valid_email|callback_validate_credentials');
$this->form_validation->set_rules('password', 'Password', 'required|md5|trim');
if($this->form_validation->run() ){
$user_id= $this->model_users->get_id($this->input->post('email'));
$user_status = $this->model_users->get_status($this->input->post('email'));
$data = array (
'user_id' => $user_id,
'email' => $this->input->post('email'),
'user_status' =>$user_status,
'is_logged_in' => 1
);
$this->session->set_userdata($data);
}
if ($this->session->userdata('user_status')=='0') {
redirect('main/admins');
}
elseif ($this->session->userdata('user_status')=='1') {
redirect('main/members');
}else{
redirect('welcome/login_page');
}
}
public function validate_credentials(){
$this->load->model('model_users');
if($this->model_users->can_log_in() ){
return TRUE;
} else {
$this->form_validation->set_message('validate_credentials', 'Invalid useername(email-id) or password. !');
return FALSE;
}
}
....the view(login.php)......
echo form_open("first/signup_validation");
echo'<div class="row">';
echo'<div class="form-group col-md-6 col-xs-12 col-sm-6">';
echo'<label for="email">Email<span></span></label>';
echo'<input type="text" class="form-control" id="email">';
echo'</div>';
echo'<div class="form-group col-md-6 col-xs-12 col-sm-6">';
echo'<label for="password">Password<span></span></label>';
echo'<input type="password" class="form-control" id="password">';
echo'</div>';
echo'</div>';
$data2 = array(
'class' => 'btn btn-default',
);
echo form_submit($data2, 'Login');
echo form_close('');
?>

Answer 1

echo '<input type="text" class="form-control" id="email">';
Your input elements don't contain a name attribute. The name is what's used as the identifier in the validation rule.
$this->form_validation->set_rules('email'... // <- 'email' is the name attribute
Do this...
echo'<input type="text" class="form-control" id="email" name="email">';