asp.net必填字段校验器至少有一个文本框，包含文本 [英] asp.net required field validator for at least one textbox contains text

问题描述

我有一个asp.net Web窗体，我怎么/可以使用必填字段校验，以确保它们中的至少一个包含文本的三个文本框？

I have three textboxes on an asp.net webform, how/can I use a required field validator to ensure that at least one of them contains text?

推荐答案

我会用一个CustomFieldValidator是这样的：

I would use a CustomFieldValidator like this:

<asp:CustomValidator runat="server"
         ID="MyCustomValidator"
         ValidationGroup="YOUR_VALIDATION_GROUP_NAME"
         OnServerValidate="MyCustomValidator_ServerValidate"
         ErrorMessage="At least one textbox needs to be filled in." />

，然后在codebehind您有：

and then in your codebehind you have:

protected void MyCustomValidator_ServerValidate(object source, ServerValidateEventArgs args)
{
     if (/* one of three textboxes has text*/)
         args.IsValid = true;
     else
         args.IsValid = false;
}

您还可以添加一个客户端组件，此验证，并使其性感与AJAX工具包的ValidatorCalloutExtender控制扩展它。

You can also add a Client-side component to this validation, and make it sexy by extending it with AJAX toolkit's ValidatorCalloutExtender control.

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