How to raise warning before closing WebUI tab?

Question

Hi All,For a project we are implementing a user is making changes to a relatively large table. The user has the possibility to store these changes in a database.However, when a user closes his/her browser after having made these changes and forgets to store the changes in the database the changes have to be made all over again. Is there a way to raise a warning when closing the browser? In this case that would refer to a user that has made changes, but has not stored them in the database.I know using a uponleave procedure works when navigating to a different page, however when closing a tab no warning is raised using such a uponleave procedure. Furthermore, I have seen multiple sites raising a warning when closing the tab, so curious to see if this is possible to do in the AIMMS WebUI as well!

MarcelRoelofs · Accepted Answer

Obviously, there are more scenarios to consider where the connection to a webui app gets closed than just closing a browser tab, e.g. the user closes the browser altogether, laptop battery drained, BSOD, …

Therefore, shouldn’t you rather consider protecting against lost edits inside the model? There are at least two options that come to mind without even thinking this through very thoroughly:

The WebUI has an option to save a case when the backend session terminates, and open that case the next time a new webui session opens. You could also setup a similar scheme by coding this in PreMainTermination & PostMainInitialization yourself, where you have the option to better control when you want to trigger the use of such a mechanism.
Use CDM to automatically store user edits as soon as they are done. This would also allow undoing changes based on the history. As a bonus, CDM would allow multiple users to make changes to the data in a consistent way.

Hope this will give you sufficient ideas to continue.

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