how can I do nested drop downs in category filter?

[dunba...@gmail.com]

Suppose I have five topic categories, and I want to put them in a drop down each selection of which creates a new child drop down, and each of these are Google control wrapper category filters connected to a data table and chart wrapper. How do I do that? 

[samuel.ma...@bbva.com]

It would be awesome if you find out how to do this. Please share you are.

Thank you

[Jean-Rémi Delteil]

you can do that with dependent filters:

'For advanced usages, you can also bind controls to other controls to establish chains of dependencies.'

dashboard.bind(countryPicker, regionPicker).bind(regionPicker, cityPicker);

Find the documentation here:
https://developers.google.com/chart/interactive/docs/gallery/controls#6-establish-dependencies

at the end of the part 6

If you chain category filters you will have the desired result.