How to change the default "The field must be a number"

Question

I'm working on an MVC 3 application. One of the fields in the model is of type double and defined as follows:

    [Required(ErrorMessageResourceName = "ListingItemPriceRequired", ErrorMessageResourceType = typeof(ErrorMessages))]
    [Display(Name = "DisplayListingItemPrice", ResourceType = typeof(Display))]
    [Range(1, 500000000, ErrorMessageResourceName = "ListingItemPriceNotWithinRange", ErrorMessageResourceType = typeof(ErrorMessages))]
    public double Price { get; set; }

Still, when I enter a value of a number with some trailing spaces like "342 ", I get the default message "The field price must be a number".

Even the validation attribute on the Price input field has something as "data-val-number".

Thanks

ScottE · Answer 1 · 2015-02-26T17:39:28.043

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If you're ok with changing just the unobtrusive validation side of things, you can always supply your own jquery validation attributes:

@Html.TextBoxFor(model => model.Price, new Dictionary<string, object>() { { "data-val-number", "Price must be a valid number." } })

Or, the following is simpler as MVC replaces underscores with dashes in attribute names:

@Html.TextBoxFor(model => model.Price, new { data_val_number = "Price must be a valid number." })

edited Feb 26 '15 at 17:39

answered Dec 16 '13 at 16:49

ScottE

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Awesome solution @ScottE, literally I was searched the whole internet but didn't find any relavent solution. This works great. Thank you...!!!!! – Yogesh Patel Mar 11 '16 at 03:52
Wow! I'm also surprised this worked so easily! Thanks Scott! – Andres Elizondo Apr 04 '19 at 07:00
Perfect answer !! – El7or Apr 17 '20 at 15:03

score 6 · Accepted Answer · edited May 23 '17 at 12:25

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The default message is baked deeply into the framework, as a string resource. It is added by the default model binder when trying to bind the string value to a double type. So if you want to change this default message you could write a custom model binder. Here's an example I wrote for the DateTime type which has the same issue: https://stackoverflow.com/a/7836093/29407

edited May 23 '17 at 12:25

Community

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answered Aug 06 '12 at 16:12

Darin Dimitrov

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Thanks Darin. For each data type there is a model binder? btw, do you have a blog? – Bill Aug 06 '12 at 18:52
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I implemented a custom model binder, but still on the client side, the same sentence is displayed, the default one. How to inject another message even on client side? Thanks – Bill Aug 07 '12 at 10:13

score 6 · Answer 3 · answered Nov 05 '13 at 15:40

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I found it easier to just say:

 [RegularExpression("([0-9]+)", ErrorMessageResourceType = typeof(ErrorMessage), ErrorMessageResourceName = "NumberInvalid")]

answered Nov 05 '13 at 15:40

Nick

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This is a much simpler way of doing it. – Sprintstar Feb 26 '15 at 13:02

How to change the default "The field must be a number"

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