> Hi David,
>
> To use something similar to VBScript/COM objects in java you would use
> JSP/JavaBeans.
I know, I'm already (successfully) doing that. My problem is tying Javabean
method calls into user events (clicks, rollovers, etc). This is possible
with VBScript/COM, but I haven't been able to find any way to do this with
JSP/Javascript.
here's a reduction of what MS is doing:
<object id=x classid="clsid:xxx" border=0 width=0 height=0 VIEWASTEXT>
.
.
</object>
<script>
function doStuff {
x.method("param");
}
</script>
if i try something similar with JSP:
<jsp:useBean id="x" scope="session" class="com.maya.x" />
<script>
function doStuff {
x.method("param");
}
</script>
i get a javascript error: x is null or not an object. this is because the
"object" tag is part of the DOM, whereas the "jsp:usebean" is a server
processed tag which doesn't exist in the DOM and so isn't accessable via
Javascript. At least, that's my (admittedly limited) understanding of what's
going on.
> You can also include any java class you like in your JSP page with the
> 'import' tag. I can't see really why you'd want to access a servlet from a
> JSP, but you can send the http request to a servlet from a JSP. I think
you
> need to read up a bit more about how to use JSP, servlets and beans in a
web
> application since you can do everything with JSP that you can with ASP and
> more.
Except for what I'm trying to do above :) Don't get me wrong, I'm pretty
much agnostic when it comes to web technologies, but lean towards anything
that's not Microsoft, for all the obvious reasons. I just think that the
idea of what a "dynamically generated page" is, is changing rapidly from a
page that is processed on the server and rendered as static HTML (which is
what JSP seems to do) to a page that can go out, get information, and update
itself *without* refreshing the entire page or forwarding to another page.
I'm coming from a front-end web developer's point of view - I care about
making the user experience as satisfying, quick, and impressive as possible.
> Javascript and Java are seperate technologies - ASP and COM are designed
to
> be used together. Oh, and of course they're (to all intents and purposes)
> platform specific and proprietry, limitations java doesn't have.
Yeah, I know. That seems to be the limitation. If Beans could be implemented
in pages via the <object> tag, it'd solve all my problems.
david
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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
