Distributed Event Manager (DEM)

The DEM is a dedicated communication channel between Union and your application and is required for Union to work.

To establish the DEM, simply reference Union’s ClientEventHub JavaScript located at \[UNION\_URL\]/assets/client-event-hub\[.min\].js.

Most events broadcast through the DEM are handled for you, however, you may also need to use the DEM in code for various reasons. Once the DEM is established, it can be accessed on a window variable named eventHub.

EventHub’s Methods

subscribe

Subscribes to an event emitted by Union.

Argument	Type	Description
name	string	Name of the event you are subscribing to
callback	function	Callback to be invoked when the event occurs. A payload will be passed to the method when applicable

emit

Argument	Type	Description
name	string	Name of the event you are broadcasting
payload	any	Payload you want to be provided to subscribers

const eventHub = window['eventHub'];

if (eventHub) {
  eventHub.emit('wait.on'), {subtle: false});
}