Purpose
Reactivates a custom dialog box after the user clicked OK or Cancel.
Syntax
Dialog Preserve Restrictions
This statement may only be issued from within a sub procedure that acts as a handler for an OKButton or CancelButton dialog box control. You cannot issue this statement from the MapBasic window.
Description
The Dialog Preserve statement allows the user to resume using a custom dialog box (which was created through a Dialog statement) even after the user clicked the OKButton or CancelButton control.
The Dialog Preserve statement lets you "confirm" the user's OK or Cancel action. For example, if the user clicks Cancel, you may wish to display a dialog box asking a question such as "Do you want to lose your changes?" If the user chooses "No" on the confirmation dialog box, the application should reactivate the original dialog box. You can provide this functionality by issuing a Dialog Preserve statement from within the CancelButton control's handler procedure.
Example
The following procedure could be used as a handler for a CancelButton control.
Sub confirm_cancel
If Ask("Do you really want to lose your changes?",
"Yes", "No") = FALSE Then
Dialog Preserve
End If
End Sub See Also:
Alter Control statement, Dialog statement, Dialog Remove statement, ReadControlValue() function