asp.net mvc validation must be a number custom error

Question

I am new to asp.net and I have a problem. When the users insert in a editor for a decimal field something other than numbers, they get an error \"Field name\" is not a number. B

Answer 1

Look for solution at the end of this page:

http://jwwishart.wordpress.com/2010/03/22/custom-server-and-client-side-required-validator-in-mvc-2-using-jquery-validate/

I checked this in my MVC 3 RTM project and it works well.

Answer 2

You can set ResourceClassKey of ClientDataTypeModelValidatorProvider class to name of a global resource that contains FieldMustBeNumeric key to replace mvc validation error message of number with your custom message. Also key of date validation error message is FieldMustBeDate.

ClientDataTypeModelValidatorProvider.ResourceClassKey="MyResources"; // MyResource is my global resource

See here for more details on how to add the MyResources.resx file to your project:

The field must be a number. How to change this message to another language?

Answer 3

This is the actual answer:

Create a class CustomClientDataTypeModelValidatorProvider. Copy the code from the MVC sources. Change the method MakeErrorString to output the appropiate message like this:

private static string MakeErrorString(string displayName)
{
    return string.Format(
        CultureInfo.CurrentCulture, 
        Core.Resources.Errors.EroareNuENr, 
        displayName);
}

I couldn't find a way not to copy the code just extend it as it uses this static method. If anyone knows this please tell me.

Then, in global.asax, I wrote this:

var cdProvider = ModelValidatorProviders.Providers.SingleOrDefault(p => p.GetType().Equals(typeof(ClientDataTypeModelValidatorProvider)));
            if(cdProvider != null)
            {
                ModelValidatorProviders.Providers.Remove(cdProvider);
                ModelValidatorProviders.Providers.Add(
                        new CustomClientDataTypeModelValidatorProvider());
            }

so that the flow would actually be routed to my class and not the class in the asp.net MVC dll

I got the idea from here:

Answer 4

Unfortunately this is is not a trivial task. However you can try the following hack... Better to do this only on essential fields, as this is more code to maintain.

In the controller's action method

if(ModelState.IsValid)
{
  // code
}
else
{
  if (ModelState["YourField"].Errors.Count > 0)
  {
    ModelState["YourField"].Errors.Clear(); 
    ModelState.AddModelError("YourField", "Your custom message here");
  }

  // code
}

Answer 5

Hope I understand your, to change RangeValidator ErrorMessage just initialize ErrorMessage parameter:

[Range(0, 100, ErrorMessage = "Some another error message insert here!")]
[RegularExpression("\d", ErrorMessage = "!!!")]
public decimal DecimalField { get; set; }

Answer 6

... or use jQuery to change to message on the client.