Accessing array elements from the Faces EL

Someone had this question on email and I thought it best to share the answer here.
On Tue, 23 Mar 2004 16:25:23 +0800, zhang xinxin said:ZX> I want to ask you how can output array
ZX> for example
ZX> I define an array in SearchItemBean and bind value to it:
ZX> private String[] array=new String[2];
ZX> public String[] getArray() {
ZX> array[0]="a";
ZX> array[1]="b";
ZX> return array;
ZX> }
ZX> and I can output the array as following:
ZX> <h:output_text id="arra" value="#{SearchItemBean.array[0]}"/> <br>
ZX> but if I wang to output using parameter,it failed:
ZX> in jsp page it write as this:
ZX> <%
ZX> int i=0;
ZX> %>
ZX> <h:output_text id="arra" value="#{SearchItemBean.array[<%=i%>]}"/> <br>
ZX> Can you tell me how to use paremeter in output_text?thanks!
Sure,
The reason what you're doing doesn't work is that anything inside of
"#{}" is for deferred evaluation and is evaluated by the JSF engine,
while scriptlets are evaluated by the JSP engine. I have modified the
guessNumber demo included in the 1.0 release to do what you're trying to
do.
8<-------------------------------------
Index: greeting.jsp
===================================================================
RCS file: /export/cvs/jsf-demo/guessNumber/web/greeting.jsp,v
retrieving revision 1.22
diff -u -r1.22 greeting.jsp
--- greeting.jsp     9 Mar 2004 22:51:27 -0000     1.22
+++ greeting.jsp     23 Mar 2004 16:36:20 -0000
@@ -40,6 +40,7 @@
<HEAD> <title>Hello</title> </HEAD>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
+ <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<body bgcolor="white">
<f:view>
<h:form id="helloForm" >
@@ -54,6 +55,10 @@
     <h:commandButton id="submit" action="success" value="Submit" />
<p>
     <h:message style="color: red; font-family: 'New Century Schoolbook', serif; font-style: oblique; text-decoration: overline" id="errors1" for="userNo"/>
+          <hr />
+ <c:set value="1" var="i" scope="request" />
+
+ <h:outputText id="array" value="#{UserNumberBean.array[requestScope.i]}" />
</h:form>
</f:view>
8<-------------------------------------
What I'm doing here is to store the variable into request scope, then I
can access it using the implicit object requestScope.
This approach should give you what you need.
Ed (EG Member)

Thank you for your answer!
but I still have question.
I will output a array,but the size of array is dynamic,
and the size is passed by the SearchItemBean.
How can I control the i to increase to the specify number?
how can I pass the size parameter into the <c:set>?
How can I use a paratemer passed by size and control the "i" to increase to it?
thanks!

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> My situation is that I have an array of clusters on the front panel.
> Each element is used for a particular test setup, so if the array size
> is three, it means we have three identical test setups that can be
> used. The cluster contains two string controls and a button: 'device
> ID' string, 'start' button and 'status' string.
>
> In order to keep the diagrams simple, I would like to use a reference
> to the array as input into a subvi. This subvi will then modify a
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