[Piwik-hackers] how to set criteria before my widget is filled with data?

[Sergey Stoyan]

Hi all,

I wrote a plugin and added it to Piwik's Menu with several widgets proposed.
I need now to provide a possibility for the user to enter some text
criteria before the picked widget is filled with data.
It can be done as a text box in the widget or beside it (the last case
would be better because of this criteria is common for all widgets of
my plugin.

Please advice a way to do this.

May it be some html tab (like provided date and period) where the user
can enter data that will be saved to his session and then used within
the plugin?

Thank you,
Sergey