Combine JSP with Java Script!

Question

Hi,
I am writing a .jsp file. I am able to put value of jsp into my java script code like..
var i = <%= k %>
but, now my requirement is reverse. I need to put the value of java script variable i into jsp variable k.
Someone told me that it is possible using eval function.
Now, using eval function , I can do the following ...
function xyz() //java script function
eval(<% int k = 5; %>);
but, I need to put the value of java script variable i into k.
I tried eval(<% int k = %> + i);
but it is not working that way.
Can anyone tell me how can I achieve this? Please reply as soon as possible.
Thanks

Answer 1

Just came across this, and even though it's old, I thought Id add something to it since I know a lot got problems combining javascript and jsp; and that most usually don't provide enough info to get someone started.
To be able to "use" Java variables inside a javascript, you need to pass them in the function call:
<%
    String aVariableToPass = "tadaaaaa";
%>
<form onSubmit="myFunction(this,'<%=aVariableToPass %>')" method="post" name="myForm" action="">
   <table>
     <tr>
          <td>
               <input type="submit" value=HitMe" name="submit"/>
          </td>
     </tr>
   </table>
</form>The function:
function myFunction(form, theVariablePassedIn)
         var accessToTheVariable = theVariablePassedIn;
}Now use accessToTheVariable inside the javascript, or theVariablePassedIn directly if you please.
Cincerely. P