OKCancel (Function)

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Characteristics of dialog box
Displaying the dialog box
Line break in the dialog box
Miscellaneous
Emulation
Application in the background: Android 10 specific case

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WEBDEV

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See also

OKCancel (Function)

In french: OKAnnuler

Displays a message in a standard dialog box that proposes "OK" and "Cancel" and returns the user's choice.

Remarks:

This is a blocking dialog box. To continue running the application, the user must validate one of the buttons.
Versions 25 and later
To avoid blocking the application, use OKCancelAsynchronous.
New in version 25
To avoid blocking the application, use OKCancelAsynchronous.
To avoid blocking the application, use OKCancelAsynchronous.
WINDEV allows you to apply the skin template of your project to this dialog box. See Customizing dialog boxes for more details.

Versions 15 and later

This function is now available for Android applications.

New in version 15

This function is now available for Android applications.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Versions 24 and later

This function is now available in Ajax mode.

New in version 24

This function is now available in Ajax mode.

Example

// Delete a line with confirmation (yes by default)
IF OKCancel("Delete this record?") THEN
HDelete(CUSTOMER)
END

// Choice used to exit the program
IF OKCancel("Do you want to exit from the program?") = Yes THEN
Close()
END

// Ask to confirm the deletion of the file whose
// name is found in the FILE_NAME variable, with
// positioning on the "No" button in the OKCancel window
IF OKCancel(No, "Delete the file?") THEN
fDelete(FILE_NAME)
END

Syntax

Displaying an OK/Cancel dialog box Hide the details

<Result> = OKCancel([<Selected button>, ] <Text> [, <Line 2> [... [, <Line N>]]])

<Result>: Boolean

Identifies the button selected by the user:
False The "Cancel" button was chosen by the user.
True The "OK" button was chosen by the user.

<Selected button>: Optional boolean

Button selected by default in the dialog box:
No "Cancel" button selected by default.
True
(by default) "OK" button selected by default.

<Text>: Character string

Text to display.

<Line 2>: Optional character string

Text displayed on the following lines.

<Line N>: Optional character string

Text displayed on the following lines.

Displaying an OK/Cancel dialog box on the browser Hide the details

OKCancel([<Selected button>, ] <Code for OK> , <Code for cancel> , <Text> [, <Line 2> [... [, <Line N>]]])

<Selected button>: Optional boolean

Button selected by default in the dialog box:
No "Cancel" button selected by default.
True
(by default) "OK" button selected by default.

<Code for OK>: Character string (with quotes)

Code to run if the OK button is chosen by the Web user. This parameter can correspond to:
the name of a button. If the OK button is selected, the click code of this button will be run.
the name of a browser function or procedure. If the OK button is selected, this procedure will be run.
a string or another value. If the OK button is selected, the value will be run as being a JavaScript code.

<Code for cancel>: Character string (with quotes)

Code to run if the Cancel button is chosen by the Web user. This parameter can correspond to:
the name of a button. If the Cancel button is selected, the click code of this button will be run.
the name of a browser function or procedure. If the Cancel button is selected, this procedure will be run.
a string or another value. If the Cancel button is selected, the value will be run as being a JavaScript code.

<Text>: Character string (with quotes)

Text to display.

<Line 2>: Optional character string (with quotes)

Text displayed on the following lines.

<Line N>: Optional character string (with quotes)

Text displayed on the following lines.

Remarks

Characteristics of dialog box

The title of the dialog box corresponds to the title of the current window (or page).
To comply with the system specifications, the title of dialog box is empty by default. To define this title, use NextTitle.
To modify or define the title of dialog box, use NextTitle.

The message is aligned to 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 in parameter, it will be truncated.
The icon displayed (exclamation mark) cannot be modified.

To customize this dialog box (as well as all system dialog boxes of your application), check "Customize the system windows (Info, YesNo, Confirm, Dialog)" in the "Style" tab of the project description. See Customizing dialog boxes for more details.

Versions 16 and later

To customize this dialog box (as well as all system dialog boxes of your site), check "Apply the skin to the dialog boxes (YesNo and OKCancel)" in the "Skin" tab of the project description window.

New in version 16

Displaying the dialog box

The dialog box does not lock other processes. The dialog box is displayed in the center of the page, with a DDW effect (Dim Disabled Windows).

OKCancel uses the internal page named "WEBDEVOKCancel". To include this page in your project:

Click among the quick access buttons.
The element creation window appears: click "Page" then "Page".
Click "Internal page" in the wizard and select the internal page named "OK/Cancel".
Validate. The "WEBDEVOKCancel" page is displayed in the editor.
Save the page by keeping its default name.

Line break in the dialog box

The CR string (Carriage Return) can be used to force a break to the next line. For example:

IF OKCancel("Caution: you are going to delete this record" + CR + ...
"Do you want to continue?") THEN
HDelete(CUSTOMER)
END

is equivalent to:

IF OKCancel("Caution: this record will be deleted", ...
"Do you want to continue?") THEN
HDelete(CUSTOMER)
END

You also have the ability to use the syntax of multiline strings. For example:

OKCancel(
[
Caution: you are going to delete this record.

Do you want to continue?
])

Miscellaneous

The timers (TimerSys) are not stopped during the call to this function.
Windows events are not stopped when this function is called.
You can use the code wizard to enter the function in the code editor. Depending on the characteristics entered in the wizard, the function used can be different in the code that is automatically generated.
DelayBeforeClosing limits how long the message is displayed. The dialog box is automatically closed. For question or confirmation dialog boxes, the default button corresponds to the expected answer.
The text of the buttons is displayed in the system language.
Versions 20 and later
If your project uses pre-launched sessions, this function must not be used in the "Initializing" event of the project. This function must be used in the event "Initializing the project after connection to the site".
New in version 20
If your project uses pre-launched sessions, this function must not be used in the "Initializing" event of the project. This function must be used in the event "Initializing the project after connection to the site".
If your project uses pre-launched sessions, this function must not be used in the "Initializing" event of the project. This function must be used in the event "Initializing the project after connection to the site".
This function must not be used:
- in the event "Resizing" of the window. Otherwise, the application will be locked.
- in the event "Changing the orientation" of the window.
- in the event "Move to the foreground" associated with the project.
  Remark: However, the function can be used in the event "Move to the foreground" of a window.
- in a thread.

Emulation

To emulate an OKCancel message, use EmulateOKCancel.

Versions 25 and later

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

OKCancel can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

New in version 25

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

OKCancel can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

Application in the background: Android 10 specific case

From Android 10, it is no longer possible to open a window when the application is in the background.

OKCancel can open a window. If this function is used while the application is in the background, a fatal error will occur.

Tips:

It is possible to determine if the application is in the background using InBackgroundMode.
If an application needs to interact with the user while it is in the background, the solution is to display a notification (via the Notification type). When the notification is clicked on, the application will be brought back to the foreground if ..ActivateApplication is set to True. It is also possible to open a window from the procedure passed to ..ActionClick.

See Android 10: Behavior of applications in the background for more details.

Business / UI classification : UI Code

Component : wd250obj.dll