passing variable from java script to jsp script let [duplicate]

the way this other post stays, is the correct one.

1- create an ajax call (in Javascript) in your webpage to send your desired params to another page.

2- create a page (in jsp) where you request the data sent by the #1.

That's the correct way to go.

#1 Here's an example on how to make an ajax call, you need this on step #1, if your using jquery is simple as:

String data1 = "myData1";
String data2 = "myData2";
String your_jsp_page_to_request = "myJspPage.jsp";

$.post(your_jsp_page_to_request,
    { param1: data1, param2: data2 },
    function(data){
       alert("Data Loaded: " + data);
    }
);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

#2 Then in your jsp you need to request the data sent, just using:

String data1 = request.getParameter("param1");
String data2 = request.getParameter("param2");