Send data but not in a form
I am new to web development, and I am writing a little test site to learn some stuff. But I'm not sure how to send data to the server that is not in a form. I have two specific questions at the end of this post, but I'll try to give the relevant details first:
I enter a url in my browser that maps to a JSP on the server (JBoss/Tomcat on the server side). That JSP reads products from a database and presents a little 'shop' on the browser.
When the user adds an item to their cart, I make an Ajax call to the server, which adds to the cart and returns xml representing the cart contents.
var req = new XMLHttpRequest();
req.open("GET", "checkout", false);
if (req.status == 200)
var doc = req.responseText;
The checkout servlet writes html which contains a form for the user to enter their delivery details. As you will see, I wait for the servlet to send its response and then I overwrite the current document with it.
Question1 - What I'm doing seems wrong to me. I'm sure I should just be going to another page, a "checkout" page, rather than overwriting the current document. But as my checkout button is not in a form I don't know how to do that.
Question2 - my second question is that when I submit the form with the delivery details on it, I do not have the parameters I expect when the request hits my servlet. Instead of "CustomerName", "AddressLine1" etc, the only parameters I have are "x" and "y", both of which contain a number (a different number each time).
To solve my first question I just had to wrap the shopping basket image in an anchor. So instead of:
<img src="/ptest/page_images/cart.jpg" onclick="checkout();" alt="Go To Checkout" width=83 height=83/>
I have this:
<a href="checkout"><img src="/ptest/page_images/cart.jpg" alt="Go To Checkout" width=83 height=83></a>
Still got the strange x, y parameter thing going on though.
I do get all my parameters sent now. For each input in the form I was specifying an id attribute, but not a name attribute. Although specifying a name attribute means that I get all the parameters sent, I still get the x and y parameters sent too. Not really bothered about them now that I am getting my parameters, but still a bit curious.
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