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I know what to do but don't know how to implement it..  RSS feed

trupti nigam
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Posts: 640
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Hi all,
I am developing a small shopping cart application in which I have one servlet. I am displaying the total items in the shopping cart. I have provided one button to proceed to checkout. At this stage if the user wants to update the number of items (he wants to order)he can do that by just changing the no of items text field. I know what to do when the user cliks the "update" button but I don't know exactly where to place the code. I mean there are 2 buttons so how to tell the servlet what to do when a particular button is pressed.
When the user cliks the "update" button the displaying items going to be same (same page is going to be displayed)only the ordered quantity (field) is going to change.

below is the code from the servlet.
Vector itemsOrdered = cart.getItemsOrdered();
if(itemsOrdered.size() == 0)
out.println("<h2><i>No items in your cart...</i></h2>");
out.println("<table border=1 align=\"center\">\n"+
"<tr bgcolor = \"#FFAD00\">\n"+
"<th>Item id<th>Description\n"+
"<th>Unit cost<th>Number<th>Total cost");
ItemOrder order;
NumberFormat formatter = NumberFormat.getCurrencyInstance();

String formURL = "servlet/myServlet.OrderPage";
formURL = response.encodeURL(formURL);

for(int i=0;i<itemsOrdered.size();i++)
order= (ItemOrder)itemsOrdered.elementAt(i);
"<td>"+ order.getItemId()+"\n"+
"<td>"+ order.getShortDescription()+"\n"+
"<form action=\""+formURL+"\">\n"+
"<input type=\"hidden\" name=\"itemId\" "+
"value = \""+order.getItemId()+"\">\n"+
"<input type=\"text\" name=\"numItems\" "+
"size=13 value = \""+
"<input type=\"submit\"\n "+
"value = \"Update Order\">\n"+
formatter.format(order.getTotalCost()) );


String checkOutURL = response.encodeURL("/myDevelopment/jsp/CheckOut.jsp");
"<form action=\""+checkOutURL+"\">\n"+
"<input type=\"Submit\" \n "+
"value = \"proceed to checkout\">\n"+

} // synchronized

Jeanne Boyarsky
author & internet detective
Posts: 36440
Eclipse IDE Java VI Editor
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You can have the form's action send you to a different servlet depending on which button they clicked (using a different URL.) Alternatively, you can use a hidden input form field. You set this field to have a different value in each form. Then you can check the value of this parameter in your servlet.
It is sorta covered in the JavaRanch Style Guide.
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