How do I send a notification when an app event happens?

To send a notification when an app event happens, you usually need 3 pieces:

1. Detect the event in your app
2. Trigger a notification when that event occurs
3. Choose how to notify the user
   • in-app popup/banner
   • email
   • push notification
   • SMS, etc.

Basic pattern

Event happens → event handler runs → notification is created/sent

Example concepts

Web app

If a user submits a form or completes a task:

function onUserAction() {
  // event happened
  sendNotification("Action completed!");
}

Mobile app

If a user finishes something in the app:

• Android: use NotificationManager
• iOS: use UNUserNotificationCenter
• For remote push notifications, use services like:
  • Firebase Cloud Messaging (FCM)
  • Apple Push Notification service (APNs)

Backend app

If something happens on the server:

• log the event
• publish it to a queue or event system
• a worker sends the notification

Common options

• Local notification: generated on the device/app itself
• Push notification: sent from a server to the device
• In-app notification: shown while the user is using the app

Simple implementation idea

1. Define the event
2. Add a listener/handler
3. Call your notification function inside that handler

Example pseudo-code:

if event_happened:
    notify_user("An event occurred")

If you want, I can give you a concrete example for:

• JavaScript/web
• Python
• Android
• iPhone/iOS
• React Native
• Flutter