how to flash error data on view in codeigniter - php

Question

how to flash error on view in codeigniter.... i m creating login on
codeigniter but if user login value not equivalent to dataase table
value. then i need to show error ....invalid user name or
password.. for that i m using set_flashdata but.... on view when i
call that by error_message(). then error showing:
Call to undefined function error_message() .....
mylogin auth controller:
public function auth() {
$data['title'] = 'Heart Surgeon';
$this->form_validation->set_rules('username', 'Username', 'trim|required|xss_clean');
$this->form_validation->set_rules('password', 'Password', 'trim|required|xss_clean|callback_login');
if ($this->form_validation->run() == TRUE) {
$Value['admin_username'] = $this->input->post('username');
$Value['admin_password'] =md5($this->input->post('password'));
if ($Value != null) {
$result = $this->user_model->login($Value);
if($this->session->set_userdata($result) != null){
redirect('dashboard');
}
}
} else {
$this->index();
}
}
my model
public function login($value) {
$query = $this->db->get_where('tbl_admin', $value, 1);
if ($query->num_rows() > 0) {
$row = $query->row_array();
$sess_arr = array(
'admin_user' => $row['admin_username'],
'adm_key' => $row['admin_key'],
'admin_type' => $row['admin_type'],
'admin_id' => $row['admin_id'],
'admin_logged_in' => TRUE
);
$this->session->set_userdata($sess_arr);
}
else{
$this->session->set_userdata(array('msg_type'=>'error'));
$this->session->set_flashdata('error', 'Invalid username/password');
redirect('home');
}
}
my view
<?php if (!defined('BASEPATH')) exit('No direct script access
allowed'); ?> <?php $this->load->view('layout/header'); ?>
<div class="container">
<div class="row">
<div class="col-md-4 col-md-offset-4 text-center logo-margin ">
<img src="<?php echo base_url(); ?>assets/img/logo.png" alt=""/>
</div>
<div class="col-md-4 col-md-offset-4">
<div class="login-panel panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">Please Sign In</h3>
</div>
<div class="panel-body">
<?php if (validation_errors()) {
?>
<div class="warning" style="padding: 0px;">
<?php echo validation_errors(); ?>
</div>
<?php
}
$atts = array(
'width' => '650',
'height' => '400',
'scrollbars' => 'yes',
'status' => 'yes',
'resizable' => 'yes',
'screenx' => '0',
'screeny' => '0'
);
?>
<div><?php echo error_message();?></div>
<?php echo form_open('home/auth'); ?>
<fieldset>
<div class="form-group">
<input class="form-control" placeholder="E-mail" name="username" type="email" autofocus>
</div>
<div class="form-group">
<input class="form-control" placeholder="Password" name="password" type="password" value="">
</div>
<div class="checkbox">
<label>
<input name="remember" type="checkbox" value="Remember Me">Remember Me
</label>
</div>
<!-- Change this to a button or input when using this as a form -->
<input type="submit" value="login" class="btn btn-lg btn-success btn-block">
</fieldset>
<?php echo form_close(); ?>
</div>
</div>
</div>
</div> </div> <?php $this->load->view('layout/footer'); ?>

Answer 1

you calling wrong function to get flash error
try set flash error on controller :-
$this->session->set_flashdata('error', 'Invalid username/password');
get error flashdata on view :-
<?php echo $this->session->flashdata('error');?>
For more :- http://ellislab.com/codeigniter/user-guide/libraries/sessions.html

Answer 2

Basically when we set any name value pair using set_flashdata method(),
$this->session->set_flashdata('error', 'Invalid username/password');
it will automatically be discarded/removed from the session once it will be read using
$this->session->flashdata(); method.
I am 100% agreed with Rakesh.