jQuery Validator Plugin - check for existing Username/Email in mysql database

Question

I\'ve successfully created a form that submits and adds users to a mysql database, and form validation with \'jQuery Validator\' plugin works great for everything except che

Answer 1

For WordPress & PHP

Most important thing is instead or return true or false, need to echo 'true' or 'false'

jQuery or JS

   email: {
     required: true,
     minlength: 6,
     email: true,
     remote:{
        url : 'your ajax url',
        data: { 
                'action': 'is_user_exist',
              },
        },
   },

WordPress or PHP Backend Code

In backend you will automatically get the value of field via GET method.

/*
 *@ Check user exists or not
 */
if( !function_exists('is_user_exists_ajax_function') ):
    function is_user_exists_ajax_function() {
        $email = $_GET['email'];
        if( empty($email) && is_email($email) ):
            wp_send_json_error( new \WP_Error( 'Bad Request' ) );
        endif;

        $is_email = email_exists( $email );

        if($is_email):
            echo 'false';
        else:
            echo 'true';
        endif;

        wp_die();
    }
    add_action( 'wp_ajax_is_user_exist', 'is_user_exists_ajax_function' ); 
    add_action( 'wp_ajax_nopriv_is_user_exist', 'is_user_exists_ajax_function' ); 
endif;