Question

I have a radtextbox with double type mode. And i have set round as 1. So it is giving the result as

 20.6 => 20.5
 20.7 => 20.5
 20.9 => 21.0

But all i need is like this (few samples)

 20.6 => 21.0
 20.5 => 20.5
 20.4 => 20.0

 20.29 => 20.0
 20.53 => 20.5
 20.59 => 21

I tried to fix this by restricting the more than one decimal value. but the code is not working properly.

Code:

<script type="text/javascript">
function GetIndex(sender, args) {
    var textbox = $find('<%= CPDPointsTextBox.ClientID %>');
    var val = textbox.get_value();
    var dsds = val.toString();        
    if (dsds.indexOf(".") > -1) {
        if (dsds.length - (dsds.indexOf(".") + 1) > 1) {
            alert(dsds.length - (dsds.indexOf(".") + 1));
            args.set_cancel(true);               
        }
        else
            return true;
    }
    else {
        if (parseInt(dsds) > 0) {
            return true;
        }
        else
            args.set_cancel(true);
    }
}

<telerik:RadNumericTextBox ID="CPDPointsTextBox" Width="39px" runat="server" MaxLength="5"
                                            MaxValue="999" MinValue="0">
                                            <NumberFormat DecimalDigits="1" KeepNotRoundedValue="false" />
                                            <ClientEvents OnValueChanged="CPDPointsTextBox_ValueChanged" OnKeyPress="GetIndex" />
                                        </telerik:RadNumericTextBox>

Answer 1

The following code meets the expectation. Thank you for all your replies.

Code:

    function change(lnk, evt) {
    var textbox = $find('<%= CPDTextBox.ClientID %>');
    var val = lnk.value.toString();
    if (val != '') {
        if (val.indexOf(".") > -1) {
            var values = new Array();
            values = val.split(".");
            var rouDec = round(parseFloat('.' + values[1]), 1);

            if (rouDec > .5) {
                val = parseInt(values[0]) + 1;
            }
            else if (rouDec == .5) {
                val = parseInt(values[0]) + .5;
            }
        }
    }

    textbox.set_value(val);
}

function round(n, dec) {
    n = parseFloat(n);
    if (!isNaN(n)) {
        if (!dec) var dec = 0;
        var factor = Math.pow(10, dec);
        return Math.floor(n * factor + ((n * factor * 10) % 10 >= 5 ? 1 : 0)) / factor;
    } else {
        return n;
    }
}