array as a parameter

[vn...@ca.ibm.com]

Hi,
I'm trying to develop a tag that accepts an array as parameter.  Does
anyone know what I need to do to have this work properly and use the
contents of this
array.

For example I would like to create a tag such as the one below.  And then
the tag will function by doing something such as matching 'home' to '86400'
and 'away' to '604800':

<mytaglib:list name="myname"  valueProperty="{86400,604800}"
displayProperty="{'home', 'away' }"/>


Common sense says that I just treat the parameter like any other array
(ie:see the set method below) but for some reason I get an error when using
the tag.


public void setValueProperty(String [] value){


     valueProperty=value;


}


(where valueProperty is defined as a String array)

If anyone could help me with this, it would be greatly appreciated.



Thanks,

Vipan Nikore


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Re: array as a parameter

[Shawn Bayern <ba...@essentially.net>]

On Fri, 7 Jun 2002 vnikore@ca.ibm.com wrote:

> Hi,
> I'm trying to develop a tag that accepts an array as parameter.  Does
> anyone know what I need to do to have this work properly and use the
> contents of this
> array.
> 
> For example I would like to create a tag such as the one below.  And then
> the tag will function by doing something such as matching 'home' to '86400'
> and 'away' to '604800':
> 
> <mytaglib:list name="myname"  valueProperty="{86400,604800}"
> displayProperty="{'home', 'away' }"/>

You cannot pass a Java array literal to a JSP tag.  You can either use an
rtexprvalue to pass the information to the tag for a pre-defined array, or
use JSTL's expression language (with a JSTL tag) to do the same
thing.  That is, either

  <% Object[] a = { ... } %>
  <mytaglib:list valueProperty="<%= a %>" />

or

  <c:forEach items="${myArrayFromAScopedVariable}"/>

-- 
Shawn Bayern
"JSTL in Action"   http://www.jstlbook.com
(coming in July 2002 from Manning Publications)


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