How to get a JavaScript session attribute in a JSP page?

Question

function submit() {
    var name = document.getElementById('name').value;
    var mob = document.getElementById('number').value;

    sessionStorage.setItem("name", name);
    sessionStorage.setItem("mob", mob);
    document.getElementById("leadForm").action = "/confirm";
    document.leadForm.submit();
}

On the confirm page, my JSP is called where I want to print this name and mob passed in a session, and along with it, one more attribute selected on this page, I have to pass it to another page.

I am not sure how to get session values from JavaScript to JSP.

Writing in my JSP page:

String name = (String) session.getAttribute("name");
out.println(name);

I am getting null value.

And please, don't use scriptlets in a JSP page, it is so 90's, and not in a good way :) — meskobalazs
– meskobalazs, Commented Feb 10, 2015 at 7:33

Santhosh · Accepted Answer · 2015-02-10 07:20:00Z

1

sessionStorage is related to the browser and the variables name , mob are set in the client side not in the request.

You could either pass them to the server side , or display their values using the javascript again ,

  sessionStorage.getItem('name');

answered Feb 10, 2015 at 7:20

Santhosh

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user2575725 · Accepted Answer · 2015-02-10 07:20:11Z

0

JS sessionStorage and JSP session are not the same.

If you had submitted the html form with name and mobile no then this will do:

submit.jsp

<form action='confirm.jsp'>
   Name: <input type='text' name='name'/><br/>
   Mobile No: <input type='text' name='number'/><br/>
   <input type='submit' value='Submit'/>
</form>

confirm.jsp

Name: ${param.name}<br/>
Mobile: ${param.number}<br/>

answered Feb 10, 2015 at 7:20

user2575725

Comments

meskobalazs · Accepted Answer · 2015-02-10 07:32:28Z

0

You could create hidden fields for these variables in leadForm.

<form name="leadForm" method="post" action="/confirm">
    <input type="hidden" name="name"/>
    <input type="hidden" name="mob"/>
    ...
</form>

Then you can set them in your #input() function as:

document.leadForm.name.value = name;
document.leadForm.mob.value = mob;

Now, if you post the form, the values will be available for you:

String name = (String) request.getParameter("name");
String mob = (String) request.getParameter("mob");

They won't be in the session, as the session is a server side concept (remember, HTTP is stateless), but they will be in the HTTP request. If you need them in the session from now on, you can put them into it.

edited Feb 10, 2015 at 7:32

answered Feb 10, 2015 at 7:24

meskobalazs

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