JSP EL: local variables

[Timo Nentwig]

Hi!

How can I access locale variables? Something like:

<%
String foo = "bar";
%>
length of foo: $(foo.length)


Timo

 

[Joona I Palaste]

Hi!

How can I access locale variables? Something like:

<%
String foo = "bar";
%>
length of foo: $(foo.length)

JSP gets compiled to Java, so you access local variables like any other
variables. I don't remember the syntax off hand.

 

[Enrique]

length of foo: <%= foo.length() %>

 

[Timo Nentwig]

length of foo: <%= foo.length() %>

That's not EL.

 

[David Lesaffre]

Hi!

How can I access locale variables? Something like:

<%
String foo = "bar";
%>
length of foo: $(foo.length)


Timo

Why not

<c:set var="foo" value="bar"/>
length of foo: <cut value="${foo.length}"/>

In JSTL 2.0, something like this may work also

length of foo: ${foo.length}

 

[Chris Smith]

That's not EL.

Clearly not... but since EL can't do this, it seems that "not EL" is the
only remaining choice. Alternatively:

<% pageContext.setAttribute("foo", foo); %>
length of foo: ${foo.length}

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www.designacourse.com
The Easiest Way to Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation

 

[Timo Nentwig]

Clearly not... but since EL can't do this, it seems that "not EL" is the
only remaining choice. Alternatively:

Apparently, yes :-( I thought, EL was part of JSP2 but it's part of JSTL
only...

<% pageContext.setAttribute("foo", foo); %>
length of foo: ${foo.length}

Doesn't work. But ${pageContext.foo} doesn't work either(?)...

 

[Chris Smith]

Apparently, yes :-( I thought, EL was part of JSP2 but it's part of JSTL
only...

Well, EL *is* part of JSP 2.0. It's also part of JSTL. The EL is
available in JSTL even for pre-2.0 JSP versions; but EL expressions can
be placed directly in the page for JSP 2.0 pages.

Doesn't work. But ${pageContext.foo} doesn't work either(?)...

Okay, how exactly does it not work?

--
www.designacourse.com
The Easiest Way to Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation

 

[Enrique]

That's not EL.

Oops, missed that in the original question. What's EL?

 

[Timo Nentwig]

Well, EL *is* part of JSP 2.0. It's also part of JSTL. The EL is

I just wonder what I should do with stuff like ${1+1}. Great, it outputs
2 but it would be somewhat more useful if I would access my fields...

Okay, how exactly does it not work?

Well, ${foo} outputs just nothing, i.e. it just does create a new foo in
pageContextImpl and ${pagecontext.foo} throws this exception:

javax.servlet.ServletException: Unable to find a value for "foo" in
object of class "org.apache.jasper.runtime.PageContextImpl" using
operator "."