I wanted to realize a single marker containing more POIs using js, such as this.
I've red documentation and various post regarding clustering but they are outdated and partial.
Can you help me to find some complete example or more detailed informations?
you implemented your clustering algorithm (e.g. using the very basic
implementation from the post above),
it is up to you how to display custered places. You
You may even allow user to adjust the range and update clustering algorithm on distance/location updates.
The topic is a quite complex one when markers are quite big and contain labels and thumbnails. In case markers are just of a size of your thumb's nail you can reduce the number of stacked sizes to a minimum.