Question

24

JSP - how to pass a javascript var in session.setAttribute?

rated 0 times [ 27] [ 3] / answers: 1 / hits: 38122 / 9 Years ago, thu, october 1, 2015, 12:00:00

New to learning JSP, and trying out passing data between two pages.

I'm wondering if it is possible to pass a javascript variable to session.setAttribute()

At the moment, I can pass a string of text through 2 jsp files like so:

JSP1:

<% String text = hello;

session.setAttribute(test, text);%>

JSP2:

var someText = <%=session.getAttribute(test)%>

which works fine.

However, is it possible to pass through a var into session.setAttribute instead? I store some data in a javascript variable and would like to send it across to the second JSP file.

So for example:

var number = 7;

<%session.setAttribute(test, number);%>

I've tried this out and I get the error number cannot be resolved to a variable

Thanks!

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answered 9 Years ago raynamadilynl · Accepted Answer

You cannot do that since javascript executes on client & JSP executes on server side.

If you want to set javascript variable to JSP session, then you pass this variable through the URL like this

var number = 7;

window.location=http://example.com/index.jsp?param=+number;

Now receive this var in your JSP page like this

String var = request.getParameter(param);

Now set it in session

session.setAttribute(test, var);

EDIT :

var number = 7;

<%session.setAttribute(test, number);%>

In the above code, server will only execute the code inside <% %>. It does not know anything outside of the JSP tags. So, it will also dont know about your javascript variable number.

Server executes the code & the result will be sent to the browser, then your browser will execute that javascript code var number=7;.

Hope, now it is clear for you.