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NumericTextBox SpinButtons firing the window.onbeforeunload event

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This is a migrated thread and some comments may be shown as answers.
Mike Hale
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Mike Hale asked on 01 Sep 2010, 04:14 PM
I have a NumericTextBox on a page that prompts the user when they try to navigate away from that page if they have unsaved changes.

My javascript:

 

window.onbeforeunload = function () {
  if (isDirty) {
    return 'You have unsaved changes. You will lose your changes if you leave the page.';
  }
};

 
The issue is that if I enable the spinbuttons on the numeric textbox this event fires whenever the user clicks the spin button, even though they don't navigate away. Is there a way to prevent this event from firing?

 

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Dimo
Telerik team
answered on 02 Sep 2010, 10:33 AM
Hello Mike,

The issue seems specific to IE. Here is how to avoid it.

We will modify the control's code, so that the workaround will not be needed in the next version of RadControls.


<%@ Page Language="C#" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 
<head runat="server">
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<title>RadControls</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
 
<telerik:RadNumericTextBox ID="RadNumericTextBox1" runat="server" ShowSpinButtons="true">
    <ClientEvents OnLoad="changeHrefs" />
</telerik:RadNumericTextBox>
 
<script type="text/javascript">
 
function changeHrefs(sender, args)
{
    if ($telerik.isIE)
    {
        $addHandler(sender.SpinUpButton, "click", returnFalse);
        $addHandler(sender.SpinDownButton, "click", returnFalse);
    }
}
 
window.onbeforeunload = function(event)
{
    alert("onbeforeunload");
}
 
function returnFalse(e)
{
    $telerik.cancelRawEvent(e);
    return false;
}
 
</script>
 
</form>
</body>
</html>


Regards,
Dimo
the Telerik team
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Mike Hale
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Dimo
Telerik team
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