Common events reference

Drop-ins use common events for cross-component communication, authentication management, localization, and error handling. These events provide a standard way for your storefront to communicate with drop-ins and coordinate behavior across the application.

Tip

For conceptual information about the event system, see the Events guide. For drop-in-specific events, refer to each drop-in’s individual Events page.

Events overview

Event	Category	Used By	Description
authenticated	Authentication	Most B2C & B2B drop-ins	Authentication state changes
error	Error Handling	Most drop-ins	Error notifications
locale	Localization	All drop-ins	Language/locale changes

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authenticated

Category: Authentication
Direction: Emitted by external source, Listened to by drop-ins
Used By: Cart, Checkout, Order, User Account, User Auth, Wishlist, and most B2B drop-ins

Fires when the user’s authentication state changes (login, logout, token refresh, session expiration). Drop-ins listen to this event to update their internal state and UI based on the current authentication status.

When to emit

Emit this event from your storefront when:

• An authentication token is refreshed
• The authentication state is restored (e.g., page refresh with active session)
• A session expires
• A user logs out
• A user successfully logs in

Data payload

boolean

The payload is a simple boolean value:

• true = User is authenticated
• false = User is not authenticated or has logged out

Usage examples

Emit when authentication changes:

import { events } from '@dropins/tools/event-bus.js';

// User logged in
events.emit('authenticated', true);

// User logged out
events.emit('authenticated', false);

Listen for authentication changes:

import { events } from '@dropins/tools/event-bus.js';

const authListener = events.on('authenticated', (isAuthenticated) => {
  if (isAuthenticated) {
    console.log('User authenticated');
    // Update UI, load user-specific data, etc.
  } else {
    console.log('User logged out');
    // Clear user data, redirect to login, etc.
  }
});

// Later, when you want to stop listening
authListener.off();

---

error

Category: Error Handling
Direction: Emitted by drop-ins, Listened to by external code
Used By: Most drop-ins for error reporting

Fires when a drop-in encounters an error (API failure, validation error, network timeout). Your storefront should listen to this event to display error messages, log errors, or trigger error recovery logic.

When emitted

Drop-ins emit this event when:

• API requests fail
• Critical operations fail
• Network errors occur
• Unexpected errors occur
• Validation fails

Data payload

{
  message: string;
  code?: string;
  details?: any;
  source?: string;
}

Usage examples

Listen for errors from drop-ins:

import { events } from '@dropins/tools/event-bus.js';

const errorListener = events.on('error', (error) => {
  console.error('Drop-in error:', error.message);

  // Display error to user
  showErrorNotification(error.message);

  // Log to error tracking service
  if (window.Sentry) {
    Sentry.captureException(error);
  }

  // Handle specific error codes
  if (error.code === 'AUTH_EXPIRED') {
    redirectToLogin();
  }
});

// Later, when you want to stop listening
errorListener.off();

Emit errors from custom code:

import { events } from '@dropins/tools/event-bus.js';

try {
  // Your custom logic
  await customOperation();
} catch (err) {
  events.emit('error', {
    message: 'Custom operation failed',
    code: 'CUSTOM_ERROR',
    details: err,
    source: 'MyCustomComponent'
  });
}

---

locale

Category: Localization
Direction: Emitted by external source, Listened to by drop-ins
Used By: All drop-ins with internationalization support

Fires when the application’s language or locale changes. Drop-ins listen to this event to update their text content, date formatting, currency display, and other locale-specific elements.

When to emit

Emit this event from your storefront when:

• A user selects a different language
• The application detects and applies a locale based on user preferences
• The locale is programmatically changed

Data payload

string

The locale string should follow standard locale format (e.g., en-US, fr-FR, de-DE).

Usage examples

Emit when locale changes:

import { events } from '@dropins/tools/event-bus.js';

// User selects a new language
events.emit('locale', 'fr-FR');

// Or based on browser detection
const userLocale = navigator.language || 'en-US';
events.emit('locale', userLocale);

Listen for locale changes:

import { events } from '@dropins/tools/event-bus.js';

const localeListener = events.on('locale', (newLocale) => {
  console.log('Locale changed to:', newLocale);
  // Update UI text, reload translations, etc.
  updateTranslations(newLocale);
});

// Later, when you want to stop listening
localeListener.off();