如何使用Asp.NET 4.5和Razor视图（非MVC）添加自定义验证消息

Question

I have an ASP.NET 4.5 Web Site project which is using Razor views. This is not an MVC project, it is an empty web site with just a few .cshtml files in it.

I have a form where I want to validate. I found a site here that explains how to do this with a Razor view, but the Validation class does not have the methods shown in the example. I then came across the required attribute in HTML5, and I added that to each <input> in my form. This is validating the form when I submit it, but it is using generic error messages like shown in the image:

Here are my questions:

Is there some way to customize these messages?

Is there some way to validate other requirements besides required - like making sure its a number, or a certain length, etc?

*Note** I am not using MVC, so no models, etc. I also was trying to use something built in to ASP.NET if possible, and not use jQuery Validation directly.

Thanks in advance!

Answer 1

You can set your custom message with data-val-required attribute.

Make sure you added the jquery validation and Microsoft jquery unobstrustive js file in your page.

Below are the example. You can mix all data-val attributes and achieve all your combination

Example 1: Required, length

<input type="text" value="" name="UserName" id="checking-user" 
 data-val="true"
 data-val-required="The UserName field is required." 
 data-val-length-max="100" 
 data-val-length="The field UserName must be a string a maximum length of 100." 
 />

Example 2: Required, Number and Regex

<input type="text" value="" name="PaidAmount" 
   data-val="true" 
   data-val-required="Amount is required" 
   data-val-regex-pattern="[-+]?[0-9]*\.?[0-9]?[0-9]" 
   data-val-regex="Amount should be in numbers" 
   data-val-number="The field PaidAmount must be a number." 
   />

Answer 2

Yeah you can do a lot of validation with HTML5 only

Along with the text input type, there are now a host of other options, including email, url, number, tel, date and many others.

You can use setCustomValidity to customize messages and whatnot.