检查空字段和显示红色警告消息（Javascript） [英] Check empty Fields and Display red warning Message ( Javascript )

问题描述

我有一个文本字段和一个如下所示的列表：

I have a textfield and a list which looks like this :

<form name="myform" method="post" action="register.php">

    Username : <input name="username" type="text">
    Country  : <select name="country">	  
               <option value="" selected></option>
               <option value="Afghanistan">Afghanistan</option>
               </select>

<input name="submit" type="button" value="REGISTER">
</form>

首先，我想检查是否有空字段。然后，如果有空字段，则在文本字段旁边显示红色警告消息，如空用户名或空国家。因此，当我按下REGISTER按钮时，如果有空字段，它将显示警告。否则，它将进入register.php



提前致谢！

First, I want to check if there is empty field. Then, if there is empty field , display a red warning message like "Empty username" or "Empty Country" beside the textfield. So, when i press REGISTER button, it will display warning if there is any empty field. Otherwise, It will proceed to register.php

Thanks in advance!

推荐答案

看看这些链接在Javascript表单验证 -

JavaScript表单验证 [ ^ ]

JavaScript - 表单验证 [ ^ ]

Javascript验证 [ ^ ]

[ ^ ]

Have a look at these links on Javascript form validation -
JavaScript Form Validation[^]
JavaScript - Form Validation[^]
Javascript Validation [^]
Client Side Validation using JavaScript[^]

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