Question

I’m currently wondering about server side validation of a field.

For example I have a field which can’t be blank, must be a number & must be under the value of 999999.

Example code to validate would be:

 If checkNumeric(txtBaseSalary.Text) = True Then
            txtBaseSalary.CssClass = "text"
        Else
            x += 1
            step_4 += 1
            txtBaseSalary.CssClass = "text error"
 End If

If val(txtBaseSalary.Text) = 0 or val(txtBaseSalary.Text) > 999999  Then
            x += 1
            step_4 += 1
            txtBaseSalary.CssClass = "error text"
        Else
            txtBaseSalary.CssClass = "text"
End If

However I’m sure you’ve spotted the issue, if it fails the first validation but passes the second the error amount (step_4) will go up, however if passes the second then the visual representation is cleared.

Does anyone have any implementations of doing multiple validations against a field without nested if statements?

As well, please provide solutions that could apply to any situation where multiple validation is required, not simply here is a way you can validate that one situation I’ve posted.

Answer 1

You can either

• use a CustomValidator with ValidateEmptyText=true and code that checks your condition or
• use a RequiredFieldValidator that checks for empty text and a CompareValidator that checks for a numerical value in a given range.

---

<asp:CompareValidator runat="server" 
    id="cmpNumbers" 
    controltovalidate="txtBaseSalary" 
    valuetocompare="999999"
    operator="LessThan" 
    type="Integer" 
    errormessage="The number should be smaller than 999999!" /><br />

You could use an Ajax ValidatorCalloutExtender to apply your CSS on error. Another option is to use JQuery.