RequiredFieldvalidator [英] RequiredFieldvalidator

问题描述

我的网页中有四个文本框.我想应用必填字段验证器，以便至少需要一个文本框值，这是强制性的，必须具有四个值中的任何一个.

Hi,

I have four textboxes in my web page. I want to apply required field validator such that atleast one of the text box value is required,it is mandatory to have value in any one of the four . how to validate that.

推荐答案

我建​​议您编写JavaScript代码来实现这一目标:
非常简单.做这样的事情

I would suggest you to write javascript code to achieve this:
Its pretty simple. Do something like this

function validateTextboxes()
        {
            if((document.getElementById(''txtbox1'').value == "") && (document.getElementById(''txtbox2'').value == "") && (document.getElementById(''txtbox3'').value == "") && (document.getElementById(''txtbox4'').value == ""))
            {
                alert(''alert msg'');
                return false;
            }
            
            else
            {
                return true;
            }
        }

调用按钮的onClientclick函数.如下所示:

Call the function onClientclick of button.. something like this:

OnClientClick="return validateData();"

在服务器端，请在执行操作之前进行相同的检查，以便如果禁用了javascript，则仍会执行验证.

希望对您有帮助！

On server side do the same checking before doing operations so that if javascript is diabled, validation is still performed.

Hope this helps!!!

您也可以使用AJAX进行服务器端验证，而无需执行完整的回发.在此处查看更多信息:使用Ajax进行ASP.NET验证.

另外，AJAX Control Toolkit的一些扩展可以执行相同的操作:

You could also do server side validation without performing a full postback with the use of AJAX. See more here: ASP.NET Validation using Ajax.

Also, there are some extensions to the AJAX Control Toolkit that can do the same thing: AJAX Server-Side Validation.

这篇关于RequiredFieldvalidator的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！