在表单中输入数据期间验证用户名 [英] validation of user name during the entering the data in form

问题描述

我正在填写用户注册表格.当用户提交表单时，如果用户名是重复的，则将用户名显示为主键，不要重复.

如果他们提供的名称是重复名称，我想向用户显示该名称已经存在的消息.



非常感谢您的帮助.

I am making a user sign up form. When the user submits a form, if the user name is a duplicate then show the user name as a primary key not repeated.

I would like to show a message to the user that the name already exists if the name they provide is a duplicate.



Any help is greatly appreciated.

推荐答案

使用AJAX，
http://www.w3schools.com/php/php_ajax_database.asp [

use AJAX,
http://www.w3schools.com/php/php_ajax_database.asp[^],
you can get data without reloading a form

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