Howdy bro
Thanks for you reply. I do have a couple of points to touch on. This is not
an argumentitive reply.
I do understand that the method doesn't explicitly see the <out> object (see
my second last paragraph starting "I can see that if this were to work...").
But instead of outright rejection of the syntax by the translator, what I
would expect is a complilation error complaining about the non-existance of
an <out> variable. In other words, I would expect things to break at the
compile stage rather than the translation stage. Do you see what I mean?
It all comes back to a conscious decision (by translator implementors) not
to accept any non-code (or, if you like, any inner scriptlet tags) within
declaration tags. My guess is that:
1. The specification explicitly states that declaration tags cannot contain
inner tags; or
2. The spec makes no explicit mention on the topic.
I might have to actually read the specs to get the answer from the horse's
mouth - GULP!! :)
Thanks again.
Rob
----- Original Message -----
From: "iZone Infotech" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, March 17, 2001 1:47 AM
Subject: Re: Inner scriptlet tags
> Dear Rob,
>
> If I understand your email correctly, you are interested to know 'why'
> rather than 'how'.
>
> Let me try to explain.
>
> Eventhough JSP looks like ASP, the working is not similar. The JSP file
is
> compiled into a Java Servlet, the very first time it is executed.
> Subsequent calls, the Java Servlet is executed, until you make some
changes
> in the original JSP file.
>
> The whole script you write between <% and %> and the html tags between
them
> are compiled together to become part of the service() method of the
servlet.
> This method is executed every time a servlet is called.
>
> The content in <%! and %> becomes a part outside the sevice(). So your
> method testMethod() becomes a seperate method outside the service(), in
the
> servlet.
>
> Now, when you execute the servlet, the service has 2 parameters request
and
> response, which takes care of the communication. The Writer is bound to
the
> response. In JSP 'out' is the default Writer. All the html you have is
> equivalent to writing out.print("some html code"). The scope of 'out' is
> only within the service() method. the scope of response also is limited
to
> the service() method.
>
> Since testMethod() being outside service(), that does not understand 'out'
> or 'response'. In the servlet, your method will look something like this.
>
> testMethod()
> {
> out.print("<p align='center'>How are you today?</p>");
> }
>
> This method does not understand 'out', so gives error.
>
> The best way to solve the problem is rewriting the method like,
>
> String testMethod()
> {
> String retStr="<p align='center'>How are you today?</p>";
> return retStr;
> }
>
> and calling it in the main JSP page as
>
> <%= testMethod() %>
>
> I have not tried it, so please excuse me if it does not work. But
logically
> it should work, and I believe it explains your question. Also, if you
pass
> 'out' to the testMethod() and write the method as given above, in the JSP,
> it should work(again logically).
>
> Best regards,
>
> Dantus
>
>
> ----- Original Message -----
> From: Rob L'Estrange <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Sunday, March 18, 2001 8:02 AM
> Subject: Re: Inner scriptlet tags
>
>
> > Thanks for your reply Sachin. :)
> >
> > You seem to be saying "Well of course you can't do that within
declaration
> > tags. Go and read up on JSP tags to improve your understanding" hehe.
> Thanks
> > for the advice, but I'm not sure you fully understood my question. It's
a
> > legitimate one I think. Let me expand...
> >
> > The supplied syntax is illegal for JSP because JSP translators
consciously
> > reject HTML embedded in method declarations. We're in agreement on
that -
> > they are built to work that way, no arguments.
> >
> > My question is: "Why? Why are the JSP translators built not to accecpt
> HTML
> > embedded in method declarations?". I'm not saying that JSP should or
that
> it
> > shouldn't support this syntax; my goal is to understand if there is a
good
> > reason why JSP translators work this way. For all I know, there is a
very
> > good reason. As mentioned, JSPs primary competitor (ASP) does accept the
> > syntax, and this is very handy. And, I do think there is an argument
along
> > the lines of, "Well the whole idea of server pages is the blend of HTML
> and
> > code. Why not support HTML embedding even within declarations of
methods?"
> >
> > I can see that if this were to work, the declared method with the
embedded
> > HTML would have to have a signature that included a JSPWriter parameter.
> > Beyond that, I can't see a barrier to translators being able to handle
> HTML
> > embedded in method declarations. But I accept that just because I cannot
> see
> > a problem, that there isn't one. Hence my query to this list.
> >
> > What do you think? Is there a good reason why this syntax is not
> supported?
> > Or, perhaps, it is supported by some vendors and not others?
> >
> > Rob
> >
> >
> > ----- Original Message -----
> > From: "Sachin S. Khanna" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Friday, March 16, 2001 11:39 PM
> > Subject: Re: Inner scriptlet tags
> >
> >
> > > Well <! .... > this is a jsp declaration and not a scriptlet.
> > > There has been a lot of discussion on the difference, use of jsp
> > declaration
> > > and scriptlets.
> > > All of which can be found at the mail archives of this list.
> > > Please help yourself as well as this list by searching for them out
> there.
> > > Have a nice day.
> > > With regards,
> > > Sachin S. Khanna.
> > > www.emailanorder.com
> > >
> > > ----- Original Message -----
> > > From: Rob L'Estrange <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Sunday, March 18, 2001 3:42 AM
> > > Subject: Inner scriptlet tags
> > >
> > >
> > > > Hi All
> > > >
> > > > I've been developing with ASP for sometime and have finally got
around
> > to
> > > > checking out JSP.
> > > >
> > > > I've come across something curious. In the source code at the bottom
> of
> > > this
> > > > email, the highlighted code would be permissible (semantically) in
ASP
> > but
> > > > is not permissible in JSP. I'm using Tomcat 3.2.
> > > >
> > > > I understand where the translator is "breaking down" and why - in
> short,
> > > the
> > > > translator has been built not to process scriptlet tags within a
> > > declaration
> > > > tag. And I understand that there are ways of achieving the same
> result,
> > > and
> > > > that not all people would see this feature as necessary. But... I
have
> > > found
> > > > the technique useful in ASP development - which is the same as
saying,
> > for
> > > > me at least, the technique is useful in server page development. Is
> > there
> > > a
> > > > good reason why JSP translators are not built to handle this kind of
> > > syntax?
> > > >
> > > > Thanks
> > > > Rob
> > > >
> > > > ==================================
> > > >
> > > > <%@ page language="Java" %>
> > > >
> > > > <%!
> > > >
> > > > private void testMethod(){
> > > > /* Start: Here's the violating code. */
> > > > %>
> > > > c > > <%
> > > > /* End: The violating code. */
> > > > }
> > > >
> > > > %>
> > > >
> > > > <html>
> > > > <head>
> > > > <title>Hello</title>
> > > > </head>
> > > >
> > > > <body bgcolor="#FFFFFF">
> > > > <h1 align="center"><font face="Arial"
> color="#0000FF">Hello</font></h1>
> > > >
> > > > <%
> > > > testMethod();
> > > > %>
> > > >
> > > > </body>
> > > > </html>
> > > >
> > > >
> > >
> >
>
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> > > > Some relevant FAQs on JSP/Servlets can be found at:
> > > >
> > > > http://java.sun.com/products/jsp/faq.html
> > > > http://www.esperanto.org.nz/jsp/jspfaq.html
> > > > http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> > > > http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
> > > >
> > >
> > >
> >
>
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> > > Some relevant FAQs on JSP/Servlets can be found at:
> > >
> > > http://java.sun.com/products/jsp/faq.html
> > > http://www.esperanto.org.nz/jsp/jspfaq.html
> > > http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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> >
> >
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> > Some relevant FAQs on JSP/Servlets can be found at:
> >
> > http://java.sun.com/products/jsp/faq.html
> > http://www.esperanto.org.nz/jsp/jspfaq.html
> > http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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> >
>
>
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DIGEST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
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Some relevant FAQs on JSP/Servlets can be found at:
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http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
