asp.net mvc - How to change 'data-val-number' message validation in MVC while it is generated by @Html helper

Question

Assume this model:

Public Class Detail
    ...
    <DisplayName("Custom DisplayName")>
    <Required(ErrorMessage:="Custom ErrorMessage")>
    Public Property PercentChange As Integer
    ...
end class

and the view:

@Html.TextBoxFor(Function(m) m.PercentChange)

will proceed this html:

   <input data-val="true" 
    data-val-number="The field 'Custom DisplayName' must be a number." 
    data-val-required="Custom ErrorMessage"     
    id="PercentChange" 
    name="PercentChange" type="text" value="0" />

I want to customize the data-val-number error message which I guess has generated because PercentChange is an Integer. I was looking for such an attribute to change it, range or whatever related does not work.
I know there is a chance in editing unobtrusive's js file itself or override it in client side. I want to change data-val-number's error message just like others in server side.

Answer 1

You can override the message by supplying the data-val-number attribute yourself when rendering the field. This overrides the default message. This works at least with MVC 4.

@Html.EditorFor(model => model.MyNumberField, new { data_val_number="Supply an integer, dude!" })

Remember that you have to use underscore in the attribute name for Razor to accept your attribute.