codeigniter session with ajax input is not working - ajax

Question

view
<input type="text" class="form-control" placeholder="Username" name="username" id="username">
<input type="password" class="form-control" placeholder="Password" name="password" id="password">
<button type="button" class="btn btn-primary btn-block btn-flat" id="login">Sign In</button>
here i pass the values to the controller using ajax
<script>
$(function()
{
$('#login').click(function()
{
var username=$("#username").val();
var password=$("#password").val();
$.ajax({
url:"<?php echo base_url();?>home/check_login",
type:"POST",
async:false,
data:{username:username,password:password},
success:function(data)
{
var obj = JSON.parse(data);
var count = Object.keys(obj).length;
console.log(obj);
console.log(count);
if(obj.length==1)
{
window.location.href = "<?php echo base_url();?>home/show_dashboard";
}
else if(obj.length==0)
{
$('#modal_warning').modal('show');
}
}
});
});
});
</script>
and my controller is
public function check_login()
{
$username= $this->input->post('username');
$password= $this->input->post('password');
$newdata = array(
'username' => $username,
);
$this->session->set_userdata('ci_session',$newdata);
$details=$this->user_model->check_username($username,$password);
echo json_encode($details);
}
when click log out button
public function log_out()
{
if($this->session->unset_userdata('ci_session'))
{
$this->load->view('login');
}
else
{
echo "nooo";
exit;
}
}
when i click the logout button it gives me "noo" which i placed in else part.
When i try to print the session data, it prints nothing. How can I set session which data is passing by ajax.
I also loaded session library

Answer 1

You are doing $this->set_userdata('ci_session',$newdata); without the session. Do it like so to set session variables. $this->session->set_userdata('ci_session',$newdata);
Also make sure the session driver is loaded. To access the session variable you can do print_r($this->session->ci_session)
Further:
Unset userdata doesn't actually return anything:
/**
* Unset userdata
*
* Legacy CI_Session compatibility method
*
* #param mixed $key Session data key(s)
* #return void
*/
public function unset_userdata($key)
{
if (is_array($key))
{
foreach ($key as $k)
{
unset($_SESSION[$k]);
}
return;
}
unset($_SESSION[$key]);
}
hence its always evaluating to false. The function itself is just an alias for unset($_SESSION[$key]) you can view the function in the session core file. There is no need for the conditional statement; just $this->session->unset_userdata('ci_session'); redirect(...); is sufficient.