Set the value fo a variable in one jsp and retrieve in another jsp

Question

In jsp A, I have this statement:

<c:set var="prefix" value="fe" />

In jsp A, I include jsp B and then in B, I do:
alert(${prefix});

And I get : 'fe' in undefined How can I get the value of the variable prefix in jsp B?

Answer 1

Maybe, when the jsp is rendered, alert(${perfix}) is evaluated to alert(fe). The error you are getting is a javascript error because there is probably nothing defined as fe in your code.

What you might want to do is change it to

<c:set var="prefix" value="'fe'" />

So that it's evaluated as a String in Javascript.

Answer 2

You can set the scope of the variable to request:

<c:set var="prefix" value="fe" scope="request"/>

Also, make sure you're using the include directive rather than the include standard action. The directive happens at translation time so variables defined in the including file are available to the included file but the include standard action actually inserts the response from the included file at runtime and therefore won't have access to variables set in the including file. Simply put use this:

<%@include file="myinclude.jsp" %>

instead of this:

<jsp:include page="myinclude.jsp" />