Codeigniter - Update email only if the email doesn't exist in the database

Question

I have an update page for my users where they can edit their name, email and other info.

So far, they can edit everything. Including their email. They can enter an e

Answer 1

Your Javascript file:

$("#form_id").validate({
        rules: {
            email: {
                required: true,
                email: true,
                remote: {
                    type: "post",
                    url: "pathtocontroller/controller.php/checkEmail",
                 }
            }
        },
        messages: {
            email: {
                required: "Please enter Email!",
                email: "Please enter valid Email!",
                remote: "Email already not available!"
            }
        }

Your Controller File:

function checkEmail() {
        $userArr = $this->input->post();
        $id = $this->session->userdata('id');//if you have stored id within session else pass it within remote function
        if (isset($userArr["email"])) {
            if ($id != '') {
                $ext_cond = "id !='" . $id . "'";
            }
            echo $this->your_model_name->getUserValidation('your_email_field_name', $userArr['email'], $ext_cond);
            exit;
        }
        exit;
    }

Your Model:

public function getUserValidation($usertype = '', $value = '', $cond = '') {

        if ($usertype != '' && $value != '') {
            $this->db->select($usertype);
            $this->db->from($this->main_table);
            if ($cond != '') {
                $this->db->where($cond);
            }

            if (is_array($usertype)) {
                foreach ($usertype as $key => $type_value) {
                    $this->db->where($type_value, $value[$key]);
                }
            } else {
                $this->db->where($usertype, $value);
            }

            $user_data = $this->db->get()->result_array();
//            echo $this->db->last_query();exit;
            if (is_array($user_data) && count($user_data) > 0) {
                return "false";
            } else {
                return "true";
            }
        } else {
            return "false";
        }
    }

Answer 2

use validate library : http://docs.jquery.com/Plugins/Validation/Methods/remote

your javascript :

$("#yourFormId").validate({
        rules: {
            email: {
                required: true,
                email: true,
                remote: {
                    url: "checkmail.php",
                    type: "post"
                 }
            }
        },
        messages: {
            email: {
                required: "Please Enter Email!",
                email: "This is not a valid email!",
                remote: "Email already in use!"
            }
        }
    });

checkmail.php:

<?php
$registeredEmails = array('test1@test.com', 'test2@test.com', 'test3@test.com');

$requestedEmail  = $_POST['email'];

if( in_array($requestedEmail, $registeredEmails) ){
    echo 'false';
}
else{
    echo 'true';
}
?>

if you use codeigniter means use checkmail.php as a controller function.. you can pass your $registeredEmails array values as $registeredEmails[] = "your query result which is in for loop".

Answer 3

You can try the following code :

$this->form_validation->set_rules('email', 'lang:email', 'trim|required|valid_email|callback__is_unique_email[email]');

and the callback function should look like this :

public  function _is_unique_email($value, $field){
    $result = $this->db->where('uid !=', $this->session->userdata('uid'))
                    ->where($field, $value)
                    ->get('users')
                    ->row_array();

    if ($result) {
        $this->form_validation->set_message('_is_unique_email', $this->lang->line('_is_unique_'));
        return false;
    }

    return true;
}