contentChanged

This hook is the callback equivalent of the 'content_changed'event. It is invoked when the document content has been updated due to changes made by any user in the session.

const config = {
  'hooks': {
    // invoked whenever the document has been updated
    contentChanged: (data) => {
      // data.source === 'local' for local changes
      // data.source === 'remote' for remote changes 
      doSomthingUseful(data);
    }
  }
}
​

Event data will contain a source field, where 'local' indicates local user changes, and 'remote' indicates remote user changes.

Typical use-cases include triggering third party plugins that perform actions such as word-counting, spellchecking, or taking content snapshots

usersUpdate

This hook is the callback equivalent of the 'users_update'event. It is invoked every time a new user joins a session or an existing user leaves a session

const config = {
  'hooks': {
    // invoked whenever a user joins or leaves the session
    usersUpdate: (data) => {
      doSomthingUseful(data);
    }
  }
}

The hook'sdata object is an array that contains the current snapshot of users currently connected to the session. See 'users_update'event for details.

fetchDocOnNetworkReconnect

If specified, this hook will be invoked whenever an offline user's browser becomes online. It expects a Promise that resolves the latest document version stored in your backend data-store.

const config = {
  'hooks': {
    // invoked whenever the user's brwosers comes goes from offline -> online
    fetchDocOnNetworkReconnect: async () => {
    
       // example: run your doc data fetch api
       const doc = await fetchDocument();
       return doc;
    }
  }
}