Jsp unknown number of parameters; seriously need an idea

Question

i have a jsp page where i query for a list of items in the DB and list them using forEach
so it looks like the following
Product ID | Price | TextField where the user can enter how many they want
Product ID | Price | TextField where the user can enter how many they want
Product ID | Price | TextField where the user can enter how many they want
and finally theres a buy button on the bottom where it sends the info to servlet to figure out how many much of each product is purchased and outputs an invoice
how do i handle this when i don't know the number of products to start out with?
I won't have too many products; usually 5 to 8 at a time
how should i set up my INPUT NAME and VALUES?!
so i can post to my servlet and have it handle it easily?

Answer 1

hi friend,
when u display the products i think u will take same form fields
like if u have 10 products while displaying in the page u will take the array of form fields right...
when u submitt such page and move on to the other page for inserting the information
here u check which productid is checked .like
String productId[] = request.getParameterValues("productId");
String price[] = request.getParameterValues("price");
String quantity[] = request.getParameterValues("quantity");
note that the form field name which u declare in the display of products page will be productId,price,quantity respectively.
now u check like this
for(i=0;i<productId.length;i++)
if (productId==null)
break;
else
proid=productId[i];
price=price[i];
quant=quantity[i];
// here call the insert method of the java program which u write
I Think this will help u
the main problem with this coding is if u select 10 products u will go to database 10 times if u want to go to database only once pass the String Array of productId,Price and Quantity as a parameter to the insert method and check the selected product and insert.