CodeIgniter - 唯一值 - 错误显示

Question

I made a simple form, a newsletter subscription, which has two inputs: email and city. I use is_unique in form validation, but this error shows as text. I need to modify this text show in an alert box or warning.Need something to fix this error in design, suggestions please.

user.php controller

<?php 

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class User extends CI_Controller {

    function __construct() {
        parent::__construct();
        $this->load->helper('form');
        $this->load->helper('url');
        $this->load->library('user_agent');
        $this->load->library('form_validation');
    }

    public function create_user() {
        // field name, error message, validation rules
        $lang = $this->input->post("lang");
        $this->form_validation->set_rules('email', 'Email', 'trim|required|valid_email|is_unique[users.email]');
        $this->form_validation->set_rules('city', 'City', 'trim|required');
        if ($this->form_validation->run() == FALSE) {
            if ($lang == "en") {
                if ($this->agent->is_mobile()) {
                    $this->load->view('m_english_signup');
                } 
                else 
                {
                    $this->load->view('d_english_signup');
                }
                } //if ($this->agent->is_mobile())
            else 
            {
                if ($this->agent->is_mobile()) {
                    $this->load->view('m_arabic_signup');
                } 
                else 
                {
                    $this->load->view('d_arabic_signup');
                }
            }
        } 
        else 
        {
            $this->load->model('Users_model');
            if ($query = $this->Users_model->create_member()) {
                if ($lang == "en") {
                    if ($this->agent->is_mobile()) {
                        $this->load->view('m_english_thanks');
                    } 
                    else 
                    {
                        $this->load->view('d_english_thanks');
                    }
                } 
                else
                {
                    if ($this->agent->is_mobile()) {
                        $this->load->view('m_arabic_thanks');
                    } 
                    else 
                    {
                        $this->load->view('d_arabic_thanks');
                    }
                }
            }
        }
    }

}

Answer 1

You need to set your own error message ?

try CodeIgnitor Userguide http://ellislab.com/codeigniter%20/user-guide/libraries/form_validation.html#settingerrors