User-interaction levels

When user feedback is required, an application typically presents a dialog. This is called user interaction. It is useful and expected when you are directly interacting with the application; however, when a script is interacting with an application, a dialog brings the execution of the script to a halt until the dialog is dismissed. This can be a serious problem in an automation environment, where there is no one present to deal with dialogs.

The application object contains a user interaction level property that allows you to control the level of interaction allowed during script execution. You can suppress interaction in an automation environment or allow some interaction where scripts are being used in a more interactive fashion.


AppleScript

Using AppleScript, it is possible to send commands from one machine to another, so additional types of interaction are possible. In AppleScript:, there are four possible values for the user interaction level property:

Property Value Result
never interact No interaction is allowed.
interact with self Interact only with scripts executed from the Scripts menu (File > Scripts).
interact with local Interact with scripts executed on the local machine (including self ).
interact with all Interact with all scripts.

The four values allow you to control interaction based on the source of the script commands. For example, if the application is acting as a server for remote users, it would be difficult for a remote user to dismiss a dialog, but it would be no problem for someone sitting in front of the machine. In this case, an interaction level of interact with local would prevent dialogs from halting remote scripts but would allow dialogs to be presented for local scripts.


JavaScript

In JavaScript, there are two possible values for the app.userInteractionLevel property:

Property Value Result
DISPLAYALERTS Interaction is allowed.
DONTDISPLAYALERTS No interaction is allowed.

VBScript

In VBScript, there are two possible values for the UserInteractionLevel property of the Application object:

Property Value Result
aiDisplayAlerts Interaction is allowed.
aiDontDisplayAlerts No interaction is allowed.