如何检查电子邮件是否已经在PHP/HTML/MYSQL/数据库中 [英] how to check if the email is already in database in PHP/HTML/MYSQL/

问题描述

示例场景

当我在文本框中输入电子邮件地址时，它将自动写出已经存在的电子邮件

该怎么做?

只需要简单和基本的答案，谢谢您.

sample scenario

when i put the email address in the textbox it will automatically write email already exists

how to do that?

just need simple and basic answers thank you

推荐答案

使用AJAX. OnBlur或OnKeyDown根据需要的时间向服务器发出AJAX调用，并检查是否已存在书面文本/电子邮件.根据收到的响应，显示内容.

您可以使用传统的XMLHttpRequest或jQuery Ajax.选择适合的对象.

Use AJAX. OnBlur or OnKeyDown, based on when you want, fire an AJAX call to server and check if the written text/email already exists or not. Based on the response received, display the content.

You can use traditional XMLHttpRequest or jQuery Ajax. Pick that you are suitable with.

文本框调用c#函数的ontextchange事件，检查表中是否存在电子邮件ID

ontextchange event of textbox call c# function that check email id present or not in a table

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