Calling a Portlet from a Java Script

I’ve a HTML Page, from which I want to navigate a portlet through java script.

We do not recommend navigating directly to a portlet (however this is also possible). Instead navigate directly to a page containing a portlet(s). If in MWS you create a page, you could give it an unique alias (on the properties page). Then navigating to that page would be as simple as navigating to http://server:port/page_alias