I'm not sure what you mean by validating?

Possibly it is because of a type maybe. Can you try to remove the > in action="test2.html>".

_paq.push(['getUserId',username]); won't do anything as we do not save the username across requests. Maybe you want to call setUserId? In test2.html also make sure username is actually set.

ya thanks for the replying.

Actually i need to get the value of username in my next page(page2.html). Where piwik stores that user_id in database and i get the username in my piwik plugin, where i have written a query to display user_Id. i.e select user_id from piwik_log_visit;

& if i remove form action then,how can i redirect to next page??

I'm sorry but I don't really understand what you are trying to achieve. AFAIK it is not possible to get the username on the next page via piwik.js. Actually, you kind of have to set the username on each request instead so piwik will always use the same username across requests of a specific user.

I'm not sure if a custom "Piwik plugin" can help you there either as Piwik won't really know which user it is when you query the API. Maybe try to store the username in a session or cookie within your regular application/website, then on each page request call _paq.push(['setUserId',usernameFromSessionOrCookieOr...]);.