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Setting Selected Data back to "" or Nothing in ComboBox

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Ok I have a ComboBox that is a Drop Down List.

If the user selects an invalid selection, I pop-up a msgbox and display an error and then set focus back on the ComboBox. The displayed item is still the invalid selection the user selected. This would be fine if the user couldn't go onto another input until the error was corrected. However the user can click elsewhere or tab to the next input without seeing the error again.

So how to I set the Drop Down List back to it's default of nothing selected? I'd rather delete the input and then recreate it. Any other suggestions?

I guess along these same lines. How do I allow a user to set the selection of a drop down list back to nothing? The input isn't required and should they change their mind about inputing it I want them to be able to select nothing.



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Create an item whose text is just a space in the first slot, like so, when you are making your list.

#include <GUIConstants.au3>
#include <GuiComboBoxEx.au3>

$Form1 = GUICreate("Form1", 186, 55, 193, 125)
$Combo1 = GUICtrlCreateCombo("", 16, 16, 145, 25, BitOR($CBS_DROPDOWNLIST,$CBS_AUTOHSCROLL))
$ComboData = " |1|2|3|4|5|6"
GUICtrlSetData(-1, $ComboData,0)

While 1
    $nMsg = GUIGetMsg()
    Switch $nMsg
        Case $GUI_EVENT_CLOSE
        Case $Combo1
            Selectionchanged(GUICtrlRead ($Combo1))

Func Selectionchanged($ListOption)

    MsgBox(0, "You chose item:" & $ListOption , "Now resetting to index[0] (the first position)")
    _GUICtrlComboBox_SetCurSel($Combo1, 0)

In order to access the control(easily, at least,) you'll need to include <GuiComboBoxEx.au3>

This will let you use the following functions to access and set the currently selected item.



The validation is all up to you :)

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