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Posted to user@struts.apache.org by Rajesh <ra...@comodo.com> on 2005/07/21 07:52:07 UTC
Graphs in Struts
hi i am generating reports in a struts based application....now i want
to show data graphically also using pie-charts and bars hoe to go for it
Rajesh
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Re: Graphs in Struts
Posted by Wendy Smoak <ja...@wendysmoak.com>.
From: "Rajesh" <ra...@comodo.com>
> hi i am generating reports in a struts based application....now i want to
> show data graphically also using pie-charts and bars hoe to go for it
I'm using JFreeChart http://www.jfree.org/jfreechart. I haven't done more
than put a basic pie chart on the page so far, but based on the examples, it
can do some very fancy charts and graphs.
This doesn't have anything to do with Struts, though. :) There's a Servlet
that generates the graph, it's mapped to a particular URL and the browser
loads it with a plain old HTML <img> tag.
--
Wendy Smoak
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Re: Graphs in Struts
Posted by Harpreet Singh <hs...@fastmail.fm>.
Rajesh wrote:
> hi i am generating reports in a struts based application....now i want
> to show data graphically also using pie-charts and bars hoe to go for it
>
> Rajesh
>
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I recommend cewolf.sourceforge.net which puts a nice easy to use layer
on top of batik and jfreechart.
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Harpreet Singh
hsingh9@fastmail.fm
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Re: Struts-EL problem with struts-el-1.3.0-dev
Posted by Wendy Smoak <ja...@wendysmoak.com>.
From: "Marco Mistroni" <mm...@waersystems.com>
> Yes I actually reverted to using c:if, and it worked
> Just fine....
>
> I wanted just to report the situation to see if I was
> Using the taglib incorrectly...
> <logic:present name="${sessionScope.results}">
Even if you're going to use an expression, the 'name' attribute should still
evaluate to the _name_ of the bean, not the bean itself.
http://struts.apache.org/userGuide/struts-logic.html#present
If this works:
> <c:forEach var="entry" items="${sessionScope.results}">
> .... // this displays the loop data
> </c:forEach>
Then the <logic:present> tag would be:
<%@ taglib uri="http://struts.apache.org/tags-logic-el" prefix="logic" %>
<logic:present name="results" scope="session">
No EL required for that one. But do use the JSTL tags instead whenever
possible. :)
[BTW, in a Servlet 2.3 container, you do not need all those <taglib> tags in
web.xml. If you use the correct URI, the tlds will be located in the .jar
files in WEB-INF/lib.]
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RE: Struts-EL problem with struts-el-1.3.0-dev
Posted by Marco Mistroni <mm...@waersystems.com>.
Hello Joe,
Yes I actually reverted to using c:if, and it worked
Just fine....
I wanted just to report the situation to see if I was
Using the taglib incorrectly...
Thanx again and regards
marco
-----Original Message-----
From: Joe Germuska [mailto:Joe@Germuska.com]
Sent: 28 July 2005 12:15
To: Marco Mistroni; 'Struts Users Mailing List'
Subject: Re: Struts-EL problem with struts-el-1.3.0-dev
At 11:08 AM +0100 7/28/05, Marco Mistroni wrote:
>anyone could give me some hints on what's wrong?
>Do you think the fact that I have both struts-taglib and struts-el in
>my
>Lib directory could cause problems?
No, because el actually depends on taglib -- you have to have taglib to
use el.
If you're also using JSTL, I would always advise using <c:if>
whereever it works -- not that this shouldn't be fixed if it turns
out to be a bug.
Joe
>Hello all,
> I have an app which is using struts 1.3.. I wanted to 'replace'
>existing struts tag with struts-el tag.
>So I downloaded struts-el-1.3.0-dev and put it into my jar, (along with
>struts-taglib-1.3.0-dev)
>
>I have declared taglibs in web.xml, and I wrote a simple page which
uses
>Struts-el inside a logic:tag
>
>And, to my surprise, it did't work....
>Basically I have an attribute of type collection in my HttpSession, and
>I was trying to access it from the page using
>
><Logic:present name="${sessionScope.results}">
>
>
>for doublechecking, I wrote a scriptlet code that was trying to get the
>'results' attribute from the session, to see that if it was actually
>there..
>and it was there....
>
>Even the c:forEAch loop that uses JSTL to get that attribute works
>fine..
>
>for providing as much info as I can, here is my web.xml
>
>****************** WEB.XML (TAGLIBS ONLY) *****************************
> <!-- Struts Tag Library Descriptors -->
> <taglib>
> <taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
> </taglib>
>
> <!-- Struts-EL Tag Library Descriptors -->
> <taglib>
> <taglib-uri>/WEB-INF/struts-bean-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-bean-el.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-html-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-html-el.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-logic-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-logic-el.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-tiles-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-tiles-el.tld</taglib-location>
> </taglib>
>***************************************************************
>
>and here is my JSP (only relevant part)***************************
>
><%@ taglib prefix='c' uri='http://java.sun.com/jstl/core' %>
><%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
><%@ taglib uri="/WEB-INF/struts-html-el.tld" prefix="html" %>
><%@ taglib uri="/WEB-INF/struts-bean-el.tld" prefix="bean" %>
><%@ taglib uri="/WEB-INF/struts-logic-el.tld" prefix="logic"%>
>
><% if(session.getAttribute("results") != null) {
> java.util.Collection coll =
>(java.util.Collection)session.getAttribute("RESULTS");
> System.out.println("**** in session there are " + coll.size() +
>" elements!!!"); // this print successfully
> }
>%>
>
>
><TR>
> <TD colspan="4"><center><logic:present
>name="${sessionScope.results}">hello</logic:present><c:out
>value="${statusMsg}"/></center>
> </TD>
> </TR>
>
>
><c:forEach var="entry" items="${sessionScope.results}">
> .... // this displays the loop data
></c:forEach>
>
>***********************************************************
>
>
>other than that, in my \lib directory I have both
>struts-taglib-1.3.0-dev and struts-el-1.3.0-dev,
>and I am running my code on Jboss 3.2.5
>
>
>Thanks in advance and regards
> marco
>
>
>
>
>
>
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>For additional commands, e-mail: user-help@struts.apache.org
--
Joe Germuska
Joe@Germuska.com
http://blog.germuska.com
"Narrow minds are weapons made for mass destruction" -The Ex
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Re: Struts-EL problem with struts-el-1.3.0-dev
Posted by Joe Germuska <Jo...@Germuska.com>.
At 11:08 AM +0100 7/28/05, Marco Mistroni wrote:
>anyone could give me some hints on what's wrong?
>Do you think the fact that I have both struts-taglib and struts-el in
>my
>Lib directory could cause problems?
No, because el actually depends on taglib -- you have to have taglib to use el.
If you're also using JSTL, I would always advise using <c:if>
whereever it works -- not that this shouldn't be fixed if it turns
out to be a bug.
Joe
>Hello all,
> I have an app which is using struts 1.3.. I wanted to 'replace'
>existing struts tag with struts-el tag.
>So I downloaded struts-el-1.3.0-dev and put it into my jar, (along with
>struts-taglib-1.3.0-dev)
>
>I have declared taglibs in web.xml, and I wrote a simple page which uses
>Struts-el inside a logic:tag
>
>And, to my surprise, it did't work....
>Basically I have an attribute of type collection in my HttpSession, and
>I was trying to access it from the page using
>
><Logic:present name="${sessionScope.results}">
>
>
>for doublechecking, I wrote a scriptlet code that was trying to get the
>'results' attribute from the session, to see that if it was actually
>there..
>and it was there....
>
>Even the c:forEAch loop that uses JSTL to get that attribute works
>fine..
>
>for providing as much info as I can, here is my web.xml
>
>****************** WEB.XML (TAGLIBS ONLY) *****************************
> <!-- Struts Tag Library Descriptors -->
> <taglib>
> <taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
> </taglib>
>
> <!-- Struts-EL Tag Library Descriptors -->
> <taglib>
> <taglib-uri>/WEB-INF/struts-bean-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-bean-el.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-html-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-html-el.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-logic-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-logic-el.tld</taglib-location>
> </taglib>
>
> <taglib>
> <taglib-uri>/WEB-INF/struts-tiles-el.tld</taglib-uri>
> <taglib-location>/WEB-INF/struts-tiles-el.tld</taglib-location>
> </taglib>
>***************************************************************
>
>and here is my JSP (only relevant part)***************************
>
><%@ taglib prefix='c' uri='http://java.sun.com/jstl/core' %>
><%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
><%@ taglib uri="/WEB-INF/struts-html-el.tld" prefix="html" %>
><%@ taglib uri="/WEB-INF/struts-bean-el.tld" prefix="bean" %>
><%@ taglib uri="/WEB-INF/struts-logic-el.tld" prefix="logic"%>
>
><% if(session.getAttribute("results") != null) {
> java.util.Collection coll =
>(java.util.Collection)session.getAttribute("RESULTS");
> System.out.println("**** in session there are " + coll.size() +
>" elements!!!"); // this print successfully
> }
>%>
>
>
><TR>
> <TD colspan="4"><center><logic:present
>name="${sessionScope.results}">hello</logic:present><c:out
>value="${statusMsg}"/></center>
> </TD>
> </TR>
>
>
><c:forEach var="entry" items="${sessionScope.results}">
> .... // this displays the loop data
></c:forEach>
>
>***********************************************************
>
>
>other than that, in my \lib directory I have both
>struts-taglib-1.3.0-dev and struts-el-1.3.0-dev,
>and I am running my code on Jboss 3.2.5
>
>
>Thanks in advance and regards
> marco
>
>
>
>
>
>
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>For additional commands, e-mail: user-help@struts.apache.org
--
Joe Germuska
Joe@Germuska.com
http://blog.germuska.com
"Narrow minds are weapons made for mass destruction" -The Ex
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Struts-EL problem with struts-el-1.3.0-dev
Posted by Marco Mistroni <mm...@waersystems.com>.
Hello all,
I have an app which is using struts 1.3.. I wanted to 'replace'
existing struts tag with struts-el tag.
So I downloaded struts-el-1.3.0-dev and put it into my jar, (along with
struts-taglib-1.3.0-dev)
I have declared taglibs in web.xml, and I wrote a simple page which uses
Struts-el inside a logic:tag
And, to my surprise, it did't work....
Basically I have an attribute of type collection in my HttpSession, and
I was trying to access it from the page using
<Logic:present name="${sessionScope.results}">
for doublechecking, I wrote a scriptlet code that was trying to get the
'results' attribute from the session, to see that if it was actually
there..
and it was there....
Even the c:forEAch loop that uses JSTL to get that attribute works
fine..
for providing as much info as I can, here is my web.xml
****************** WEB.XML (TAGLIBS ONLY) *****************************
<!-- Struts Tag Library Descriptors -->
<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
</taglib>
<!-- Struts-EL Tag Library Descriptors -->
<taglib>
<taglib-uri>/WEB-INF/struts-bean-el.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean-el.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-html-el.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html-el.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic-el.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic-el.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-tiles-el.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles-el.tld</taglib-location>
</taglib>
***************************************************************
and here is my JSP (only relevant part)***************************
<%@ taglib prefix='c' uri='http://java.sun.com/jstl/core' %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<%@ taglib uri="/WEB-INF/struts-html-el.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean-el.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic-el.tld" prefix="logic"%>
<% if(session.getAttribute("results") != null) {
java.util.Collection coll =
(java.util.Collection)session.getAttribute("RESULTS");
System.out.println("**** in session there are " + coll.size() +
" elements!!!"); // this print successfully
}
%>
<TR>
<TD colspan="4"><center><logic:present
name="${sessionScope.results}">hello</logic:present><c:out
value="${statusMsg}"/></center>
</TD>
</TR>
<c:forEach var="entry" items="${sessionScope.results}">
.... // this displays the loop data
</c:forEach>
***********************************************************
other than that, in my \lib directory I have both
struts-taglib-1.3.0-dev and struts-el-1.3.0-dev,
and I am running my code on Jboss 3.2.5
anyone could give me some hints on what's wrong?
Do you think the fact that I have both struts-taglib and struts-el in
my
Lib directory could cause problems?
Thanks in advance and regards
marco
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Re: STruts-EL
Posted by Wendy Smoak <ja...@wendysmoak.com>.
From: "M4RC0" <m4...@gmail.com>
> But, a newbie question: whitch are the beneficts of using Struts-EL
> instead standar struts taglibs or JSTL???
These aren't mutually exclusive, typically you'll use the original Struts
taglib alone, or Struts-EL and JSTL 1.0 together [in a Servlet 2.3/JSP 1.2
container].
(Then when you move to Servlet 2.4/JSP 2.0, you go back to the original
Struts tags, plus JSTL 1.1.)
> After reading documentation, i really don't understand why, when and
> where to use Struts-EL.
What typically happens is that you discover JSTL, and then get frustrated by
the fact that you _can't_ use expressions in the Struts taglibs [with JSP
1.2]. Enter Struts-EL, which gives you that ability.
In your example, that runtime expression will not be able to "see" variables
set with JSTL, such as the status of a loop inside <c:forEach> or anything
set with <c:set>. Try this:
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<c:set var="myval" value="125000" />
<%= myval %>
(It won't even compile...)
The flip side of that is: JSTL cannot "see" scripting variables. This is
intentional. :)
If you're going to use JSTL 1.0, then you should use Struts-EL along with
it.
--
Wendy Smoak
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Re: STruts-EL
Posted by Jeff Beal <jb...@gmail.com>.
The second example would actually have to be:
<bean:message key="<%=
((SomeClass)request.getAttribute("someObj")).getSomeProp().getSomeString()%>"
/>
-- Jeff
On 7/26/05, Jeff Beal <jb...@gmail.com> wrote:
> It's a lot more clear to compare the difference between:
>
> <bean-el:message key="${someObj.someProp.someString}"/>
>
> and
>
> <bean:message key="<%=
> request.getAttribute("someObj").getSomeProp().getSomeString()%>"/>
>
> Especially considering the following scenarios that "just work" in EL:
>
> -- What if "someObj" may be in more than one scope?
> -- What if there *is* no 'someObj'?
> -- What if someProp is null?
>
> -- Jeff
>
> On 7/26/05, Dave Newton <ne...@pingsite.com> wrote:
> > M4RC0 wrote:
> >
> > >I mean, why to use
> > ><bean-el:message key="${stringvar}"/>
> > >instead
> > ><bean:message key='<%= stringvar %>'/>
> > >
> > >
> > Because typing ${} is easier/cleaner than typing <%= %> and it's JSP 2.0
> > syntax.
> >
> > Dave
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> > For additional commands, e-mail: user-help@struts.apache.org
> >
> >
>
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Re: STruts-EL
Posted by Jeff Beal <jb...@gmail.com>.
It's a lot more clear to compare the difference between:
<bean-el:message key="${someObj.someProp.someString}"/>
and
<bean:message key="<%=
request.getAttribute("someObj").getSomeProp().getSomeString()%>"/>
Especially considering the following scenarios that "just work" in EL:
-- What if "someObj" may be in more than one scope?
-- What if there *is* no 'someObj'?
-- What if someProp is null?
-- Jeff
On 7/26/05, Dave Newton <ne...@pingsite.com> wrote:
> M4RC0 wrote:
>
> >I mean, why to use
> ><bean-el:message key="${stringvar}"/>
> >instead
> ><bean:message key='<%= stringvar %>'/>
> >
> >
> Because typing ${} is easier/cleaner than typing <%= %> and it's JSP 2.0
> syntax.
>
> Dave
>
>
>
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>
>
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Re: STruts-EL
Posted by Dave Newton <ne...@pingsite.com>.
M4RC0 wrote:
>I mean, why to use
><bean-el:message key="${stringvar}"/>
>instead
><bean:message key='<%= stringvar %>'/>
>
>
Because typing ${} is easier/cleaner than typing <%= %> and it's JSP 2.0
syntax.
Dave
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Re: STruts-EL
Posted by M4RC0 <m4...@gmail.com>.
But, a newbie question: whitch are the beneficts of using Struts-EL
instead standar struts taglibs or JSTL???
After reading documentation, i really don't understand why, when and
where to use Struts-EL.
I mean, why to use
<bean-el:message key="${stringvar}"/>
instead
<bean:message key='<%= stringvar %>'/>
???
Thanks!
--
M4RC0
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Re: STruts-EL
Posted by Wendy Smoak <ja...@wendysmoak.com>.
> Anyone can suggest me a good link from where I can learn
> Struts-EL?
http://struts.apache.org/userGuide/building_view.html#struts-el
http://struts.apache.org/faqs/struts-el.html
You can find Struts-EL in the 'contrib' directory of the 1.2.7 binary
distribution.
--
Wendy Smoak
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STruts-EL
Posted by Marco Mistroni <mm...@waersystems.com>.
Hello all,
Anyone can suggest me a good link from where I can learn
Struts-EL?
Thanx and regards
Marco
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Re: Graphs in Struts
Posted by Manuel Cañón López <ma...@fundacionctic.org>.
Have you think about using svg?
There are a few libraries over there for stadistical graphs
Don't forget to have a look at http://xml.apache.org/batik/
Manuel
El jue, 21-07-2005 a las 11:22 +0530, Rajesh escribió:
> hi i am generating reports in a struts based application....now i want
> to show data graphically also using pie-charts and bars hoe to go for it
>
> Rajesh
>
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RE: Graphs in Struts
Posted by Mark Benussi <ma...@hotmail.com>.
If the API has the functionality and I think it does I would use the Jakarta
POI API to do them in a spreadsheet.
-----Original Message-----
From: Rajesh [mailto:rajeshphani@comodo.com]
Sent: 21 July 2005 06:52
To: user@struts.apache.org
Subject: Graphs in Struts
hi i am generating reports in a struts based application....now i want
to show data graphically also using pie-charts and bars hoe to go for it
Rajesh
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