Introduction:
Event-triggered command
Event triggers: Custom commands available/not available, player health below a certain amount, log in to server, respawn, death, resource pack related, open backpack, close backpack, lie on bed, leave bed, throw an item, switch world, etc. More events are currently under development.
We are planning to include all possible events.

Please refer to https://www.mcbbs.net/thread-1440922-1-1.html for more details.