Checkbox reveal which items are selected on page

on my page a user can select multiple items. I use a checkbox and iterate over all the items of a user. Now I want to show the user the total price of all the items he selected on that page. So to say the total price of the shopping cart.

How can I access the ids of my items on the same page that the user clicks on them? I know that in the controller I can access them by

Item.find(params[:items])

Thanks a lot in advance :)