Get Javascript values and use them in a servlet?

Hey
I have a HTML which has Javascript scripts which I have to get values from (a array to be exact) and pass them to a servlet so I can process the information in a certain way. I cant seem to find a way to do this properly as the servlet is server side and Javascript is client side. How can I implement this?
Using a quick example example I have
C:/index.html
C:/js/script.js
Index.html contains:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript" src="js/script.js">
</script>
</head>
<body>
a href="javascript:void(0);" id="add"><img src="images/menunew.png" alt="plus" border="0" />
/a>
</body>
</html>
Script.js contains:
var Script = Class.create({
a:4,
b:5,
add: function(){
return (this.a + this.b);
(Ignore syntaxis errors as this is a quick example I wrote up just to see if you can give me a practical example on how to read it.)
How can from a Java servlet access a and b from the script.js file (which contains a class named Script) and also access the function add which returns that value?
Thank you for the help
Edited by: 902756 on 16-dic-2011 0:18

DrClap wrote:
902756 wrote:
1: Yes, it seems like the logically answer but Im not too up on AJAX and even less on mixing it up with servlets. Do you mind giving me a simple add (function) sample or something similar?You are looking at it the wrong way. What you actually want to do is to have the browser send a request (which somehow contains that Javascript data) to a URL which causes the servlet to receive the data. There's no "mixing it up" going on there. The client and the server are entirely separate.
And since that request would be an HTTP request, it's just text. There's no concept in HTTP of transmitting objects, whether they be Javascript objects or Java objects. Anything you want to transmit has to be converted into text by the sender and converted back into objects by the receiver.
So there's no such thing as "a simple add function". You're going to have to stop thinking in that way and start thinking of client-server systems in the way they actually are.The thing is I want to start simple to grab a simple concept....
Im trying a AJAX route and I have the following:
/index.html
/js/Adding.js
Index contains:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
     <title></title>
     <script type="text/javascript" src="js/Adding.js"></script>
</head>
<body>
<select name="num1">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
<select name="num2">
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
</select>
<form method="get" name="adding">
Do
<span id="res"></span>
</form>
</body>
</html>
Adding.js contains
var Adding = Class.create({
x: null,
y: null,
add: function()
     var xmlHttp = new XMLHttpRequest();
     var value1 = document.getElementById("num1").value;
var value2 = document.getElementById("num2").value;
     xmlHttp.open("GET", "index.html", false);
     xmlHttp.send(value1 + value2);
     var result = document.getElementById("res");
     result.innerHTML = xmlHttp.responseText;
This shows 2 comboboxes full of numbers and link saying "Do" which calls the javascript function and adds the two numbers in the comboboxs and shows them on the screen without refreshing the page. This does not work and I would like this to work before I continue onto the bigger picture.

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Edited by: raid200 on Apr 23, 2008 12:41 PM

Copied from a newly opened topic:
raid200 wrote:
Hi
Thanks for your help . I can take one textfield value and send it to another jsp file
BUT I would to take all textfield in the row that I would use it .
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and the input variable I automatically generated look like this.
ns7:anyvalue <anonymous>

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