Assigning a Java variable to a javascript variable

Hi Folk,

If i want to assign a Java variable to a Java script variable in my application. Is it possible. If possible, let me know.

Regards
Bhanuprakash.

"BhanuPrakash Vemula V",

There aren't many rules that you need to worry about here on the Ranch, but one that we take very seriously regards the use of proper names. Please take a look at the JavaRanch Naming Policy and adjust your display name to match it.

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Thanks!
bear
JavaRanch Sheriff

That greatly depends upon what you mean by that. Please supply more details.

Perhaps read this.

I don't know if it's possible through EL. But if it is, what I would be doing is like this:

1. Assign a request-scoped variable

int myvar = 0;
request.setAttribute("myvar", myvar);

2. Use EL for javascript to use the request-scoped variable

document.write(${myvar});

That's what I'm thinking... But I might just be dreaming... lolz

I don't think it should be a problem if you want to set the variable when the page is loaded.

<% String theValue = "assigned value"; %> <script language="javascript"> var javaScriptValue = "<%=theValue%>"; </script>

Moved to the JSP forum.

Originally posted by Mike Rutgers:
I don't think it should be a problem if you want to set the variable when the page is loaded.

<% String theValue = "assigned value"; %> <script language="javascript"> var javaScriptValue = "<%=theValue%>"; </script>

Is it possible to do reverse?

I mean, assigning JS variable into Java variable.

The only way to send a value from the client to the server is to make a request, and send the value as a request parameter.

The most common way is to either append the value to a dynamic url
ie
var userName = 'Bob'; var url = "myServlet?username=" + userName;

If you are dealing with a form, then a hidden field on the form can be used.
Normally you catch the onclick of a submit button, or onsubmit of the form, and run javascript to copy the value of the javascript variable into the hidden field before the form gets submitted.

Of course you can only pass Strings as parameters, so it does have its limitations.

Cheers,
evnafets

Rathi,
Please don't hijack other people's threads.
If you have a question, start your own thread.