• Features of the dialog box
  • Line break in the dialog box
  • Miscellaneous
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WindowsLinuxPHPWEBDEV - Browser code
AndroidAndroid Widget iPhone/iPadIOS WidgetApple WatchMac CatalystUniversal Windows 10 App
Stored procedures
Displays a message in a standard non-blocking dialog box with the answers "OK" and "Cancel" and calls a WLanguage procedure with the user's response.
Confirmation example
  • This is a non-blocking dialog box. The WLanguage code that follows the call to OKCancelAsynchronous continues to run. To close the window, the user must validate one of the buttons. When the user clicks one of the buttons, the code of a WLanguage procedure is run.
  • In the WLanguage code following the call to the function, another modal window cannot be opened before closing the dialog box.
// Choice used to exit the program
OKCancelAsynchronous(No, "Do you want to exit the program?", MyProcedure_OKCancel)
INTERNAL PROCEDURE MyProcedure_OKCancel(nResponse int)
SWITCH nResponse
ToastDisplay("OK button")
CASE No: ToastDisplay("Cancel button")

Displaying an OK/Cancel dialog box Hide the details

OKCancelAsynchronous([<Selected button>, ] <Text> , <WLanguage procedure>)
<Selected button>: Optional boolean
Button selected by default in the dialog box:
No"Cancel" button selected by default.
(by default)
"OK" button selected by default.
<Text>: Character string
Text to display.
<WLanguage procedure>: Name of the procedure or lambda procedure
Name of the WLangage procedure ("callback" procedure) called when the user clicks one of the buttons in the confirmation window.
This procedure is used to find out which button was clicked, and to run a specific process if necessary.
For more details on this procedure, see Parameters of the procedure used by OKCancelAsynchronous.
This WLanguage procedure can correspond to:
  • a name of a global or local procedure,
  • a name of an internal procedure,
  • a lambda procedure.

Features of the dialog box

  • The title of the dialog box corresponds to the title of the current window (or page).
  • To modify or define the title of dialog box, use NextTitle.
  • The message is aligned to the left.
  • The captions of buttons depend on the runtime language of Windows.
  • The maximum number of characters cannot exceed 4096. If a larger string is passed as parameter, it will be truncated.
  • The icon displayed (exclamation mark) cannot be modified.

Line break in the dialog box

The CR string (Carriage Return) can be used to force a break to the next line. For example:
OKCancelAsynchronous("Caution: you are going to delete this record" + CR + ...
"Do you want to continue?", MyProcedure)
You also have the ability to use the syntax of multiline strings. For example:
Caution: you are going to delete this record.
Do you want to continue?
], Procedure_OKCancelAsynchronous)


  • Timers (TimerSys) are not stopped when this function is called.
  • The text of the buttons is displayed in the system language.
Component: wd270obj.dll
Minimum version required
  • Version 25
This page is also available for…
Click [Add] to post a comment