Java variables calculation on change in JSP (Excel replica)

I have a excel sheet that I need to replicate in JSP (using struts 1 framework). Now everything is done but I am stuck at the calculation part. As you might have seen in excel, some columns are calculations based on other columns.
So if I change field 'a', 'd' field should change automatically based on its formula (let's say, d=a*1.1 +b*2.1).
Now I tried to use the funstion in javascript where I read 'a' and 'b' values from JSP, then I calculate and everything works fine. But when I try to assign the calculation result for field 'd' in JSP throush javascript, 'd' does not change.
function adjustCalcs ()
var a = eval("document.form.al.value");
var b = eval("document.form.b.value");
var dCalc = ((a * 1.05) + (b * 1.1));
document.form.d.value = dCalc ; (this is where it should change the value of field 'd' in JSP, but ti won't...donno why?)
Or is there any better way to do these dynamic changes in JSP ? Would appreciate the insight.
Thanks,

Fine. What's your problem in JSP side then? Do you want to let Java take over the calculation and "dynamic stuff" ? Then you need to let Javascript submit the form to the server side during the change event so that JSP can then display the result using taglibs/EL. But this is less good for user experience as this costs effectively one HTTP request and the user would see a "flash of content". Alternatively you can use Ajax for this to do it all asynchronously.

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How can we use java variable in javascript code on JSP page?

How can we use java variable in javascript code on JSP page?
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]]>
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%>
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</body>
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Thanks dudes.

Please excuse me for appearing dim but my JSP skills are rather weak.
I dynamically create rows in a table from an Iterator. If the mainTopic is news then I need a third column to appear with radio buttons. I have all this done. When a radio button is selected and the UPLOAD button is selected I need to know which of the values in the table was selected.
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Thanks.
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HttpSession session = request.getSession(false);
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// other initializations etc
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<center>
<table border="1" bordercolor="#C0C0C0" width="90%" cellpadding="0" cellspacing="0" bgcolor="white">
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How can I assign javascript variables to jsp or java variables.?

How can I assign javascript variables to jsp or java variables.?

See I have generated some variables in the javascript which is on the jsp page. I want to assgin these variables to the jsp vaiables. Or how can I access javascript variables from jsp on the same jsp page.

Assigning javascript variables to java variables in JSP

Does anyone know if it possible to assign a javascript value to a java variable in a javascript function? I want to be able to use the javascript value in a PreparedStatement call, but I can't assign the value of the javascript variable to a java variable. I know the opposite can be done using hidden variables in the form, but I need:
javascript -> java variable in a JSP scriptlet.
Any help would be much appreciated,
Thanks,
-Dave

Can't do that.
html/javascript is in the client side.
jsp is in the server side.
In order to put html/javascript values (client side) into jsp (server side) it must be submitted.
Try remoting. Using an iframe with a jsp as the source of it and the html target pointing at it.
-------------

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Hi Rajeev,
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I do notice the variable var1 has the value populated - in menu.jsp - (from View -->
Source in the browser) but for some reason not able to use it in main.jspI'm not quite sure of the way your jsps are structured from your code snippet but I think there is something to be aware of here that may be part of your problem, namely the difference between the include directive and the include action.
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Assigning javascript varible value to java variable

Hi all
I want to find screen resolution in one jsp page.That can be done in javascript.
(though 'screen.width and screen.height')
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I have a java web application that is running on Sun's web server for a few years. It consists of jsp pages. In one of the jsp pages, there is a string for database. The database location and name is changing.
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Thanks

Yes, that's one use of the include directive, lets you add content inline. You missed an "@" there though. It's <%@ include...
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Java variables calculation on change in JSP (Excel replica)

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