2 questions:
1) At the moment, does EL allows bracket notation for accesing arrays?
2) If the answer is yes, it works with associations? (Maps from -let's say- strings, to beans)
Sorry, I can't try now...
At 10:53 02/06/2004 -0400, you wrote:
Good question! We can represent a multi-dimensional array as a recursive array of arrays. For example, given tag <c:setArray>, we could both allocate and assign a two-dimensional array as follows:
<%-- Create the first row, assign it values at index 0 and 1. <%-- Assign the row to myArray at index 0. --%> <c:setArray var="row" index="0" value="0"/> <c:setArray var="row" index="1" value="1"/> <c:setArray var="myArray" index="0" value="${row}"/>
<%-- Create the second row, assign it values at index 2 and 3. <%-- Assign the row to myArray at index 0. --%> <c:setArray var="row" index="0" value="2"/> <c:setArray var="row" index="1" value="3"/> <c:setArray var="myArray" index="1" value="${row}"/>
${myArray} now contains [[0,1], [2,3]].
We can use the JSP Expression Language to access each array element so that
<c:out value="${myArray[0][0]}"/> <c:out value="${myArray[0][1]}"/> <c:out value="${myArray[1][1]}"/> <c:out value="${myArray[1][2]}"/>
outputs
0 1 2 3
Note that each index of 'myArray' refers to a row, each of which is a one-dimensional array. By induction, this model extends to multi-dimensional arrays where each element of an array may refer to another one-dimensional array whose elements may themselves each refer to another one-dimensional array, and so on.
What do you think?
Derek
> -----Original Message-----
> From: Simon Benzekri
> Sent: June 2, 2004 10:10 AM
> To: Tag Libraries Users List
> Subject: RE: [JSTL] Indexed array variable
>
>
> Good idea but how will multi-dimensional arrays be populated?
>
> Simon
>
> -----Original Message-----
> From: Helios Alonso [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, June 02, 2004 9:48 AM
> To: Tag Libraries Users List
> Subject: RE: [JSTL] Indexed array variable
>
> It would be great. I think it's very appropiate (very common
> idea even for
> non-programmers, easy to implement).
>
> By example (my case): I want to make a calendar and would
> like to make it
> very generical. If I could use associations with taglibs, I'd make
> something that gives me dates (or months, weeks, and days),
> and another
> bean associating days to properties. It helps mantaining the
> calendar code
> independent from the "properties" code. And properties could be
> associations too:
>
> 'holiday' -> boolean
> 'holidayname' -> name
> 'itemscount' -> int
>
> and so on.
>
> The JSP would poduce HTML for the calendar, but guided by the
> properties of
> each day (holidays in red, days with items with a link, etc.)
>
> At 09:25 02/06/2004 -0400, you wrote:
> >I think you're right. Just like no JSTL tag exists to create an
> >associative array (a bean or a map indexed by string), no JSTL tag
> >exists that can explicitly allocate an indexed array. <jsp:useBean>
> >can create both associative and indexed arrays, and <c:set> can set
> >associative array properties, but not indexed array
> elements. I think
> >the only solution, then, is to create my own tag handler similar to
> ><c:set> that can assign array elements. Of course, this is
> >non-standard, but will solve my problem.
> >
> >Will the next version of JSTL enhance <c:set> to permit the
> assignment
> >of array elements?
> >
> >Derek
> >
> > > -----Original Message-----
> > > From: Bill Siggelkow [mailto:[EMAIL PROTECTED]
> > > Sent: June 1, 2004 8:49 PM
> > > To: 'Tag Libraries Users List'
> > > Subject: RE: [JSTL] Indexed array variable
> > >
> > >
> > > I don't think that JSTL is going to be able to "create" array
> > > elements. I think you will need to allocate the array
> ahead of time.
> > > Maybe someone else can clarify this a little more.
> > >
> > >
> > > Bill Siggelkow
> > > [EMAIL PROTECTED]
> > >
> > >
> > > -----Original Message-----
> > > From: Derek Mahar [mailto:[EMAIL PROTECTED]
> > > Sent: Tuesday, June 01, 2004 5:10 PM
> > > To: Tag Libraries Users List
> > > Subject: [JSTL] Indexed array variable
> > >
> > > How does one create and assign elements to an indexed
> array variable
> > > in JSTL or the Expression Language? <c:set> seems lacking in this
> > > respect.
> > >
> > > Derek
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