Hello,
It might be a good idea to save the current value of the variable
into a URL parameter and access it with:
<%= request.getParameter("param_name") %>
if this returns null, then the visit is the first one and the value should
be translated to 1.
Functionality for buttons is just a normal POST form with a hidden field
or a link with request parameters.
If you want to use HttpSession class for saving the state of the number,
you must save the value to session as a java.lang.Integer, because you
can't save primitive type variables directly to session.
For example:
session.setAttribute("foobar", new Integer(5);
You also must convert the request parameter from String to int by:
String foo = request.getParameter("foo");
int i = 0;
try {
i = Integer.parseInt(foo);
} catch (NumberFormatException e) {}
HTH,
Kare
On Thu, 22 Mar 2001, S. Jyotinarayan wrote:
> I have a jsp page with 'increase' and 'decrease' buttons and a variable. I
> want the variable to be initalised to 1 when this jsp page is first opened.
> And the variable should increase and decrease as I press on the respective
> buttons and be displayed on the same page. How could I do this.
> Thanx a lot in advance.
> JNS
>
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--
Kare Nuorteva
http://www.kare.uklinux.net/
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Some relevant FAQs on JSP/Servlets can be found at:
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