CODEWITHSUNDEEP
c#asp.netvalidationc#-4.0decimal
V.V
V.V

Reputation: 883

Decimal validation in server side textbox using C#

I use this code for decimal validation.It was working fine.but it allow to enter the alphabets into the text box. when i exit from the text box then only the error message will show nearby textbox.I need,if i press the alphabets the text box doesn't allow to enter the text box , how to do this?

<asp:RegularExpressionValidator ControlToValidate="txtNumber" 
                    runat="server" ValidationExpression="^[1-9]\d*(\.\d+)?$"
                        ErrorMessage="Please enter only numbers">
                    </asp:RegularExpressionValidator>

Upvotes: 1

Views: 5735

Answers (2)

Kapil Khandelwal
Kapil Khandelwal

Reputation: 16144

Using Javascript:

<asp:TextBox ID="TextBox2" onkeypress="AllowOnlyNumeric(event);" 
   runat="server"></asp:TextBox>

Javascript Code:

function AllowOnlyNumeric(e) {
    if (window.event) // IE 
    {
        if (((e.keyCode < 48 || e.keyCode > 57) & e.keyCode != 8) & e.keyCode != 46) {
            event.returnValue = false;
            return false;

        }
    }
    else { // Fire Fox
        if (((e.which < 48 || e.which > 57) & e.which != 8) & e.which != 46) {
            e.preventDefault();
            return false;

        }
    }
}

Upvotes: 1

User1000547
User1000547

Reputation: 4301

Just use the CompareValidator, you don't really need to use regex:

<asp:CompareValidator 
      ID="CompareValidator1" runat="server" ControlToValidate="TextBox1"
      ErrorMessage="Please enter a numberical value." ForeColor="Red"
      Operator="DataTypeCheck" Type="Integer">!
</asp:CompareValidator>
 <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

You can also do this on the server just using TryParse():

int x = 0;
bool valid = Int32.TryParse(TextBox1.Text, out x);
if(!valid)
   {
        //inform the user
   }

Upvotes: 4

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