20 Work With Events and Event Listeners

Events provide the mechanism that triggers action chains when users interact with your App UI. For example, when someone clicks a button to navigate to the App UI's home page, an event triggers the navigate action. Or when a page is opened, a vbEnter lifecycle event might be raised to fetch data before the page loads.

There are many types of events, and all are used to execute action chains in an App UI. Your App UI reacts to events through event listeners, which declaratively specify the action chain to run when an event occurs.