get textbox value and populate another textbox

Question

User1717218719 posted

Hi all

I am looking to calculate the following :

value in TextBox2 - value in TextBox3 = (populates) TextBox4 value

I would also like to validate that the numbers entered in the textboxes defaults to a decimal (.00)

Im using VB if anyone could help that would be great.

Answer 1

User1717218719 posted

I have the following code:

TextBox4.Text = Val(TextBox2.Text) - Val(TextBox3.Text)

but how do I default values to decimal?

Answer 2

User288213138 posted

Hi E.RU

You can use RegularExpressionValidator control to validate whether the value of an associated input control matches the pattern specified by a regular expression.

The code:

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            
            <asp:RegularExpressionValidator ID="Regex1" runat="server" ValidationExpression="^(([1-9]{1}\d*)|(0{1}))(\.\d{2})$"
                ErrorMessage="Please enter valid decimal number(00)"
                ControlToValidate="TextBox1" />

Best Regards,

Sam

Answer 3

User1717218719 posted

This is great thaks a million!

is it possible to have it so when I type in a whole number eg. 3 it automatically corrects to 3.00 ?

Answer 4

User288213138 posted

Hi E.RU，

You can use the num.toFixed(2) method in jquery.

The code:

<script type="text/javascript">
        
        $(document).ready(function () {
            $("#Button1").click(function () {
                var test = $("#TextBox1").val();
                console.log(test);
                var num = new Number(test);
                console.log(num);
                alert(num.toFixed(2));
            });
        });                  
    </script>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" />

The result:

Best Regards,

Sam