Validation with variables

Since you do a POST ajax call, the variables you send in that call will be available in the $_POST global. This means you can use the CodeIgniter form validation library just like you wold for a regular submitted form. I use it all the time.

Lets say the variable you send in your AJAX call is 'user_email'. This is what I would do to validate it.

PHP Code:

// Load library here or in your autoload config file
$this->load->library('form_validation');

// Set up validation rules
$this->form_validation->set_rules('user_email', 'Users email', 'required|valid_email');

if ($this->form_validation->run() == FALSE)
{
    // Submitted data not valid
}
else
{
    // Submitted data is valid
}