How to set up a multiple selection drilldown in a statistics table?

Hi All, I have a developed report to be shown to a set of users and everything is working well. Primarily, there is a statistics table which queries from the database and shows the results. When a user clicks on a certain row and column, he is given a popup to enter a note and a button which triggers an event (this I implemented using a JS). Now, there is a change in requirements. The user is asking if he can select multiple rows and trigger the event simultaneously for all the selected events. I realized there are 2 options: one is using JavaScript to enable a box to select multiple rows or use a JS which keeps adding multiple rows to a list as soon as one clicks on a row (Just like one click on drilldown) Is there a better approach to do this? If yes, how? Also, if I choose any of the options above, how can I achieve them? Thanks,