>>>>> "Jean-Paul" == Jean-Paul Le Fevre <[EMAIL PROTECTED]> writes:
Jean-Paul> I've been testing the new version of the standard tags library
Jean-Paul> and I'm having some difficulties.
Jean-Paul> I used to work successfully with version standard-20020130 but
Jean-Paul> with versions standard-beta1 or standard-20020326 I'm facing problems :
Jean-Paul> - I couldn't find the documentation of the new tags : out, forEach etc.
Jean-Paul> Since the syntax has changed it would be very useful to have the
Jean-Paul> description of the new syntax somewhere. I've upgraded my pages by
looking at
Jean-Paul> the examples but it is not very convenient.
The specification is a pretty good approximation of the documentation (perhaps
exact :) ).
Jean-Paul> - I've a class which is extended from an AbtractList. I added some
Jean-Paul> methods which are needed by my application (A couple of
getSomething())
Jean-Paul> but in my JS page, using <c:out value="${my_instance.something}">,
Jean-Paul> an exception is raised complaining that a conversion to integer (?)
Jean-Paul> is not possible for a List. It seems that the server does not
Jean-Paul> understand that my_instance is not a pure List but something
Jean-Paul> inheriting from a List.
In the specification, in section A.3.4, 'Operators "[]" and "."', you can see
the unfortunate circumstances that leads to this problem. It checks to see if
the class is a List before it checks to see if it's a Bean. If I were you, I
would consider making a new class (bean) which encapsulates the List and also
provides the data members.
Jean-Paul> - In a class I've a method preparing the list of options available
Jean-Paul> for some choice : getOptionList(). It returns a string which is
Jean-Paul> a concatenation of <option>choice A</option> ...
Jean-Paul> But in the JSP <c:out value = "${sample.optionList}" /> is not
displayed
Jean-Paul> if it is nested in a <select></select> where it should be.
Jean-Paul> To find out what was wrong I moved the <c:out> outside the <select>
Jean-Paul> block and my string was displayed.
I think, in general, you should avoid writing Java code which generates
XML/HTML tags, and do that explicitly in your JSP, using the tag library. In
this case, instead of returning "<option>choice A</option><option>choice
B</option> ...", you should have it return "choice A, choice B, ..." and let
"<c:forEach>" iterate over the string, building your "<option>" elements.
--
===================================================================
David M. Karr ; Java/J2EE/XML/Unix/C++
[EMAIL PROTECTED]
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