Pass Javascript Value to Java in JSP

Question

I would like to pass a Javascript value to a Java function in JSP. How can I do that? The id comes from a combobox in JSP via Javascript. I will get the ID from ComboBox and send it to Java function as parameter to get the Java result.

function Display()
{
   var IdFromCB = (document.getElementById("MListSelect")).value;
   //CALL JAVA FUNCTION HERE BY USING IdFromCB as function parameter
   //'<% getSomething(-----IdFromCB-----);%>'

}

Thanks,Mark

Karan, Please go through the lifecycle of JSP to better understand why it is not possible. — Batakj
– Batakj, Commented Dec 19, 2013 at 9:31

Suresh Atta · Accepted Answer · 2013-12-19 09:33:32Z

7

You cannot make a server call directly. You need to make a server request.

javascript plays on client side and JSP plays on server side.

What you need is you have to make a server request. And send that string as a query parameter.

Two options to achieve this.

Do not confuse that JSP and java script existed on same document(or file). Yes but JSP part compiles on server side and JavaScript executes by browser.

edited Dec 19, 2013 at 9:33

answered Dec 19, 2013 at 9:26

Suresh Atta

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Community · Accepted Answer · 2017-05-23 11:46:24Z

1

Javascript statements are rendered by Browsers and executed as client program.

In your case if you want execute a java code based on selection of html component, you would need to use ajax call .

You can find quick example here

A Simple AJAX with JSP example

http://www.programming-free.com/2013/03/ajax-fetch-data-from-database-in-jsp.html

edited May 23, 2017 at 11:46

CommunityBot

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answered Dec 19, 2013 at 9:27

Satheesh Cheveri

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