Cold Fusion Ajax Java Cart Front End

I have a Cold Fusion Cart with MS SQL. I need some sort of front end entry which will load data on page without customer having to hit 'add to cart', then refreshing page, then hitting 'continue shopping' button. I need the entry page to simply keep a running total of items in 4 categories and then display and error check the running totals. Please see the attached Excel file. There are 2 worksheet layouts which should explain what i need. I don't know if this can be done in java, ajax, cold fusion, php, etc.