RE: Nested logic:iterate tags
Hi,
I just had bad experience with ServletExec 3.0E and nested
iterate tags. When I changed the inner iterate tag back to
scriptlets things startted working again (the code worked fine
under Tomcat 3.2.1).
Is anyone aware of problems with NewAtlanta's handling of custom
tags in general or Struts in particular?
My env:
1. Sun JDK 1.2.2_5/6
2. New Atlanta ServletExec 3.0E
3. Windows 2000 Professional or Sparc Solaris 2.6
4. Jakarta Struts and Jakarta Taglib
Thanks,
--Amos
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 06, 2001 5:59 PM
To: [EMAIL PROTECTED]
Subject: Re: Nested logic:iterate tags
Marc,
Here's a sample of nested iterate tags IterateForm.java and
TimeNavDblIter.jsp.
Thanks to Craig et al it's a piece of cake.
john ware
/ TimeNavDblIter.jsp
!doctype html public -//w3c//dtd html 4.0 transitional//en
%@ page language=java import = com.jdware.beans.* %
%@ taglib uri=/WEB-INF/struts-bean.tld prefix=bean %
%@ taglib uri=/WEB-INF/struts-html.tld prefix=html %
%@ taglib uri=/WEB-INF/struts-logic.tld prefix=logic %
html:html
%
IterateForm instance = new IterateForm();
instance.setName( yeh baby );
pageContext.setAttribute(instance, instance,
PageContext.PAGE_SCOPE);
%
html:form action=/time
Name: bean:write name=instance property='%= name %' filter=true
/br/
Address bean:write name=instance property='%= address %'
filter=true /br/
table border=1 width=100%
trthType/ththSize/th
% int h = 0; %
logic:iterate name=instance property='%= foos[0].bars %'
id=anything
th
bean:write name=instance property='%= foos[0].bars[ + h +
].date %' filter=true /
/th
% h++; %
/logic:iterate
/tr
tr
% int i = 0; %
logic:iterate name=instance property=foos id=anything
tr
td
bean:write name=instance property='%= foos[ + i + ].type
%' filter=true /
/td
td
bean:write name=instance property='%= foos[ + i + ].size
%' filter=true /
/td
% int j = 0; %
logic:iterate name=instance property='%= foos[ + i + ].bars
%' id=anything
td
html:text name=instance property='%= foos[ + i + ].bars[ +
j + ].hours %' filter=true /
/td
% j++; %
/logic:iterate
/tr
% i++; %
/logic:iterate
/table
html:submit/
/html:form
/html:html
// end
TimeNavDblIter.jsp
// IterateForm.java
package com.jdware.beans;
import java.util.*;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
import com.jdware.util.Trace;
public class IterateForm extends ActionForm {
public String name = TestMe;
public String address = Sischo Dr;
public IterateForm(){
foos = Foo.getFoosByMagic();
}
public static class Foo implements Comparable {
public String type;
public int size;
public Foo(){
type=foo;
size=0;
bars = Bar.getBarsByMagic();
}
public Foo( String type, int size ){
bars = Bar.getBarsByMagic();
this.type = type;
this.size = size;
}
public static ArrayList getFoosByMagic(){
ArrayList rtn = new ArrayList();
rtn.add( new Foo(typeA, 42));
rtn.add( new Foo(typeF, 2));
rtn.add( new Foo(typeW, 4));
rtn.add( new Foo(typeH, 0));
rtn.add( new Foo(typeX, 77));
return rtn;
}
public String getType(){return type;}
public void setType( String type ){ this.type = type; }
public int getSize(){ return size; }
public void setSize( int size ){ this.size = size; }
public int compareTo(Object o){
return type.compareTo( ((Foo)o).type );
}
public static class Bar implements Comparable{
/**
*
*/
public String date;
public String getDate(){ return date; }
public void setDate( String date ){ this.date = date; }
/**
*
*/
public String activity;
public String getActivity(){ return activity; }
public void setActivity( String activity ){ this.activity =
activity; }
/**
*
*/
public double hours;
public double getHours(){ return hours; }
public void setHours( double hours ) { this.hours = hours; }
public Bar(){
date = 8/5/50;
activity = nonsense;
hours = 8.5;
}
public Bar(
RE: Help me defend Struts taglibs!!!
As the local neighborhood taglibs pusher in my company, I came under some scrutiny about the lack of an Else in tags and realised the difficulty about nesting XML tags legally, just as described by Craig in his message below. What I pretty quickly came up with is a switch syntax: struts:switch condition=%= expression % case value=%= true % ... /case case value=%= false % /case /struts:switch It's not stright-forward if/else, but it is (IMHO): 1. Legal XML 2. Relatively clear as an if/else clause 3. Provides a solution for a more general case of switch/case What do you think? Cheers, --Amos Shapira WebCollage -Original Message- From: Craig R. McClanahan [mailto:[EMAIL PROTECTED]] Sent: Thursday, May 31, 2001 6:18 AM To: '[EMAIL PROTECTED]' Subject: RE: Help me defend Struts taglibs!!! On Thu, 26 Apr 2001, Scott Cressler wrote: One thing this argument might come down to is why custom tags, especially for if...else stuff (which, BTW, IMHO is not handled real well by the struts tags...would be nicer to have more flexibility in the conditions you can check and to have the ability to do else, rather than logic:equal.../logic:equallogic:notEqual.../logic:notEqual...but that's another discussion :-). In other words, if it is so easy to just slap some Java in their to do some conditional stuff, why use a clumsy tag. It turns out to be surprisingly difficult to come up with syntax for an else construct that is legal XML syntax and isn't really ugly. There's currently work going on in the JSP Standard Tag Library effort (JSR-052) to create tags that will eventually be known to all containters in the same way that tags like jsp:useBean are -- which will also deal with a lot of the performance related concerns. It looks like there will be reasonable ways to do switch and if-else type processing with them. In the mean time, we can reconsider adding an else capability in Struts 1.1, if someone can come up with a good syntax. Craig
RE: How to use the new iterate tag?
Hi, Thanks a lot! That's exactly what I wanted. You said that it seems like an overkill to use a tag, is there another way to access this index? What are the chances to see this tag in the library? Cheers, --Amos -Original Message- From: Deadman, Hal [mailto:[EMAIL PROTECTED]] Sent: Wednesday, May 23, 2001 7:29 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: RE: How to use the new iterate tag? Do you just want to display the index? If you do, I just wrote a custom tag that does that. It allows me to remove one of the last instances of scriptlets that I have in my jsps. It's seems overkill to have a tag that just displays the iterate counter but oh well. If nothing else, you can use it as an example of how to access the index of the iterate tag. [ rest deleted ]
