Scenario:

I have a dashboard. I can embed a web page into the dashboard. I can drive this webpage using url parameters. But what if i want (e.g.) filter an Histogram of the dashboard from something selected into the html page? Is in this case javascript api usable?

I know i can write a completely new html page, embed in this page my webpage and some tableau vizzes and then make them communicate via JS api. In this case the real dashboard is the html page, and i loose the possibility to compose it visually within tableau, that is  the reason of my request

Thanks to everybody can point me to the right direction.