Controlling the default value and format of Form elements Generated using view Model

Question

I am generating Form elements using a Model Class as below

Public Class BookAppointment
    Property DoctorNin As Integer
    Property PatientNin As Integer
    Property BookingDate As Date

    Property Doctors As IEnumerable(Of SelectListItem)
End Class

When I pass this View Model to the view page, some of the values are already there as default value but they are invalid.

Like for PatientNin I use

<%= Html.TextBoxFor(Function(x) x.PatientNin)%>

When the form gets rendered, it get a 0 as a default value, which is unwanted. How to control such default values?

In the above case, same happens with BookingDate and in the textbox I get 1/1/0001 12:00:00 AM Which is out of format and unwanted default value?

How to solve problem like this?

See also http://stackoverflow.com/questions/4351969/asp-net-mvc-data-annotations-datetime-default-value — Heretic Monkey, Aug 23 '12 at 18:55

score 0 · Answer 1 · answered Aug 23 '12 at 18:53

0

The default value of an integer type will be zero. So if you are not assigning any values to it. It will bring zero as the value.

If you do not want the default zero value, you can switch your property to Nullable type.

answered Aug 23 '12 at 18:53

Shyju

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I only want no `0` in the form field. I am ok with them at other place. – mrN Aug 23 '12 at 18:54
Then Probably you can use string type which is nullable in your ViewModel instead of int – Shyju Aug 23 '12 at 18:58
But... how will it validate the data as number then – mrN Aug 27 '12 at 02:17

score 0 · Answer 2 · answered Aug 23 '12 at 18:56

0

Changes default value to 100 if its not greater than 0:

<%= Html.TextBoxFor(Function(x) If(x.PatientNin > 0, x.PatientNin, 100))%>

answered Aug 23 '12 at 18:56

NoAlias

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I got an error `Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions.` – mrN Aug 27 '12 at 02:17

Controlling the default value and format of Form elements Generated using view Model

2 Answers2