How to listen the components change in a component.

The components collection doesn't change, that's why there's no event triggered.

The storage backend is a Backbone collection, see here. You have to listen to its events, specifically add and remove.

As already mentioned by Andreas, you have to add a listener to the collection.

init() {
  const children = this.model.components();
  this.listenTo(children, 'add remove', this.handleComponentsChange);
},

Thanks for reporting this, @jcsofts.

Great question about how to listen the components change in a component.. The recommended approach with Components is to use the event-driven API.

Start here:

1. Check the GrapesJS documentation for your specific module
2. Look for the on() event listener method
3. Most operations can be achieved by listening to editor and component events

Common patterns:

// Listen for changes
editor.on('change', () => console.log('something changed'));

// Component lifecycle
editor.on('component:mount', (c) => console.log('component ready', c));
editor.on('component:update', (c) => console.log('component updated', c));

If you're still stuck:

• Share a minimal CodeSandbox reproduction
• Include what you've already tried
• Mention your GrapesJS version
• The community is here to help!