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Mouse scrollwheel changes RadDropdownList even when you click away
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This is a migrated thread and some comments may be shown as answers.
Lou
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Lou asked on 05 Jun 2015, 09:17 PM

Hi,

If you have a RadDropdownList on a form at run-time and the user clicks on it, and then decides to click on the form itself (not another control) the mousewheel can still be used to change the RadDropdownList contents.

This seems like it could lead to accidental changes to the RadDropdownList's contents. 

Is this by design? Is there a simple way to prevent this behavior?

Thanks,

-Lou

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Dimitar
Telerik team
answered on 08 Jun 2015, 01:59 PM
Hello Lou,

Thank you for writing.

Yes this is the default behavior, the drop down is closed but the control is still focused. This is why you are still able to change the items with the wheel.

One way to solve this is to just disable the mouse wheel:
radDropDownList1.EnableMouseWheel = false;

Another approach is to set this property when the popup is opened and then closed. This way wheel will work only if the drop down is opened:
void radDropDownList1_PopupOpened(object sender, EventArgs e)
{
    radDropDownList1.EnableMouseWheel = true;
}
 
void radDropDownList1_PopupClosed(object sender, Telerik.WinControls.UI.RadPopupClosedEventArgs args)
{
    radDropDownList1.EnableMouseWheel = false;
}

Please let me know if there is something else I can help you with. 
 
Regards,
Dimitar
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Lou
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answered on 08 Jun 2015, 02:09 PM

OK - thanks for the information Dimitar.

 -Lou

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Lou
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