Question

Don’t know a better title but here is what im trying to do.

I have the following form where which will display a list of books and after every book entry there is a remove button. The list can be any length. In order to get the book id I have set name="remove[${cartItem.bookId}]" but how do I get this value in a servlet? request.getParameter("remove") and request.getParameterValues("remove") returns null everytime.

  <form method="post" action="removeBookFromCart">
<c:forEach var="cartItem" items="${sessionScope.cart.cartItems}">
        <tr>
          <td><c:out value="${cartItem.title}" /></td>
          <td><input type="submit" name="remove[${cartItem.bookId}]" value="Remove"/></td>
        </tr>  
    </c:forEach>
    </form>

Answer 1

You have to use hidden parameters:

<input type="hidden" name="remove" value="${cartItem.bookId}"/>

Let the submit button be just this way:

<input type="submit" value="Remove"/>

EDIT:
Yes, you have to create a form element for each book:

<c:forEach var="cartItem" items="${sessionScope.cart.cartItems}">        
        <tr>
          <td><c:out value="${cartItem.title}" /></td>
          <td>
            <form method="post" action="removeBookFromCart">
             <input type="submit" value="Remove"/>
             <input type="hidden" name="remove" value="${cartItem.bookId}"/>
            </form>
          </td>
        </tr>      
   </c:forEach>