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Posted to taglibs-user@tomcat.apache.org by "Mark R. Diggory" <md...@latte.harvard.edu> on 2002/08/31 17:46:20 UTC
JSP 2.0 and EL
So, I'm wondering, if EL is going to be available in the JSP 2.0 Core.
Does this mean the following?
1.) Most taglibs for JSP 2.0 will be able to adopt to EL without much in
the line of code modifications?
i.e.
<prefix:tag attribute='<%=session.getAttribute("foobar")%>'/>
could easily be rewritten as
<prefix:tag attribute='${sessionScope.foobar}'/>
and the setting of the "Attribute" would be independent of the
evaluation of this would be independent of ${sessionScope.foobar}in the
taglib?
2.) Will we be able to do things like this?
<a href="${sessionScope.foobar}">An example of EL outside of a custom
tag. </a>
I have some some custom taglib's I've been working on, I was thinking of
integrating the EL Engine from JSTL into them and now, if the above is
true, I'm wondering if I really have to do that? Or if I should just
focus on implementing them for JSP 2.0.
-Mark Diggory
Harvard MIT Data Center
http://thedata.org/
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Re: JSP 2.0 and EL
Posted by "Mark R. Diggory" <md...@latte.harvard.edu>.
Very cool, this was a long time needed in JSP. I'm looking forward to this.
Cheers,
Mark
Shawn Bayern wrote:
>On Sat, 31 Aug 2002, Mark R. Diggory wrote:
>
>
>
>>So, I'm wondering, if EL is going to be available in the JSP 2.0 Core.
>>Does this mean the following?
>>
>>1.) Most taglibs for JSP 2.0 will be able to adopt to EL without much in
>>the line of code modifications?
>>
>>i.e.
>>
>><prefix:tag attribute='<%=session.getAttribute("foobar")%>'/>
>>
>>could easily be rewritten as
>>
>><prefix:tag attribute='${sessionScope.foobar}'/>
>>
>>
>
>Yes, exactly. The tag doesn't need to know whether the page author used
>an rtexprvalue or the EL.
>
>
>
>>and the setting of the "Attribute" would be independent of the
>>evaluation of this would be independent of ${sessionScope.foobar}in
>>the taglib?
>>
>>
>
>Sorry, I'm afriad I don't understand what you're asking here. But
>${sessionScope.foobar} gets evaluated by the container under JSP 2.0, not
>by the tag; the tag need not use the EL API itself.
>
>
>
>>2.) Will we be able to do things like this?
>>
>><a href="${sessionScope.foobar}">An example of EL outside of a custom
>>tag. </a>
>>
>>
>
>Yup - or in plain template text too, as in
>
> <p>
> What were you <i>thinking</i>
> when you ordered
> ${number} gallons of yogurt?
> </p>
>
>
>
>>I have some some custom taglib's I've been working on, I was thinking
>>of integrating the EL Engine from JSTL into them and now, if the above
>>is true, I'm wondering if I really have to do that? Or if I should
>>just focus on implementing them for JSP 2.0.
>>
>>
>
>It's just a matter of timing. If you want to use the EL today, you should
>probably call the evaluator yourself. But if you can wait a few months,
>then the need goes away because JSP 2.0 takes care of the problem for you.
>
>
>
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Re: JSP 2.0 and EL
Posted by Shawn Bayern <ba...@essentially.net>.
On Sat, 31 Aug 2002, Mark R. Diggory wrote:
> So, I'm wondering, if EL is going to be available in the JSP 2.0 Core.
> Does this mean the following?
>
> 1.) Most taglibs for JSP 2.0 will be able to adopt to EL without much in
> the line of code modifications?
>
> i.e.
>
> <prefix:tag attribute='<%=session.getAttribute("foobar")%>'/>
>
> could easily be rewritten as
>
> <prefix:tag attribute='${sessionScope.foobar}'/>
Yes, exactly. The tag doesn't need to know whether the page author used
an rtexprvalue or the EL.
> and the setting of the "Attribute" would be independent of the
> evaluation of this would be independent of ${sessionScope.foobar}in
> the taglib?
Sorry, I'm afriad I don't understand what you're asking here. But
${sessionScope.foobar} gets evaluated by the container under JSP 2.0, not
by the tag; the tag need not use the EL API itself.
> 2.) Will we be able to do things like this?
>
> <a href="${sessionScope.foobar}">An example of EL outside of a custom
> tag. </a>
Yup - or in plain template text too, as in
<p>
What were you <i>thinking</i>
when you ordered
${number} gallons of yogurt?
</p>
> I have some some custom taglib's I've been working on, I was thinking
> of integrating the EL Engine from JSTL into them and now, if the above
> is true, I'm wondering if I really have to do that? Or if I should
> just focus on implementing them for JSP 2.0.
It's just a matter of timing. If you want to use the EL today, you should
probably call the evaluator yourself. But if you can wait a few months,
then the need goes away because JSP 2.0 takes care of the problem for you.
--
Shawn Bayern
"JSTL in Action" http://www.jstlbook.com
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