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The App Installed event runs immediately after Share Point has finished everything that it needs to do when the add-in is installed, but before the user is notified that installation is complete. The add-in is not available for use until after your handler has completed, and your handler can cancel the installation (which causes Share Point to roll back everything it has done as part of the installation).In fact, it is a best practice to catch any errors in your handler and instruct Share Point to roll back the installation.List Booster works as an add-on on your regular out of the box Share Point list views (any lists and document libraries).It allows you to style your list, apply color schemes, manage font-styles and colors - all on top of you regular Share Point user interface.For more information, see Include rollback logic and "already done" logic in your add-in event handlers.Note When you install an add-in with Tenant scope, it is installed to the add-in catalog site collection, and the App Installed event runs then and only then.The App Uninstalling event is synchronous and you can use it to cancel the uninstallation, which would leave the add-in in the second stage recycle bin.The main purpose of a handler for this event is to delete or recycle things that were deployed with an App Installed (or an App Updated) handler.
Some examples of what a handler for this event can do: For detailed instructions about creating add-in event handlers, see Create an add-in event receiver in Share Point Add-ins.Your add-in can handle the following list item events.To change the events that the remote event receiver handles, open Solution Explorer, open the Properties window for the remote event receiver, expand the Share Point Events node, and then set only the events that you want to handle to True.Conditional formatting has always been a pain point in Share Point 2013 and Share Point Online (Office 365).Especially for those working with Share Point 20 where you were able to do conditional formatting using Share Point Designer.
use some calculated columns Java Script to apply conditional formatting to the row).