Hi,
I am looking for help with an issue, basically I have an aspx form with 4 textboxes for entering in numeric values, I want the 5ht textbox to keep a running total ((txt 1+ txt2 )- (txt3 + txt4)), I also want to prevent the user for entering alphanumber text but I want each text box to have a default value of ‘0.00’ meaning the user cannot delete the decimal point.
I so far this workinb in that my page will calculate the totals based on the code behind below, this method gets called on the OnTextChanged="addFields" method of the textbox:
protected void addFields(object sender, EventArgs e)
    {
        int TotalPlus;
        int TotalMinus;
        int TotalFinance;

        if (txt_Cust_deposit.Text.Trim().Length <= 0)
        {
            txt_Cust_deposit.Text = "0";
        }

        if (txt_Cash_Price.Text.Trim().Length <= 0)
        {
            txt_Cash_Price.Text = "0";
        }
        if (txt_Trade_in.Text.Trim().Length <= 0)
        {
            txt_Trade_in.Text = "0";
        }
        if (txt_Settlement.Text.Trim().Length <= 0)
        {
            txt_Settlement.Text = "0";
        }

        TotalMinus = Convert.ToInt32(txt_Cust_deposit.Text) +
        Convert.ToInt32(txt_Trade_in.Text);

        TotalPlus = Convert.ToInt32(txt_Cash_Price.Text) +
           Convert.ToInt32(txt_Settlement.Text);

        TotalFinance = TotalPlus - TotalMinus;

        txt_Finace_amount.Text = TotalFinance.ToString();

    }

I have added onkeyup as an attribute and called this client function from it :
function ValidateText(i)
{
    if(i.value.length>0)
    {
    i.value = i.value.replace(/[^\d]+/g, '');
    }
}

This does prevent text from being entered, but no longer calculates my total or allows me to enter a ‘.’.
Please help

__________________
Thank You