Solved

JSTL - compare a Character type value

Posted on 2004-04-16
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3,622 Views
Last Modified: 2013-12-03
Hello,

I have a bean that has a Character type property named "documentType". I try to compare its value using JSTL but to no avail. I have read that JSTL does not support explicitly the Character object but that it should be converted to String using standard Java conversion rules. However the following fails:

<c:when test="${doc.documentType == '1'}">
      <c:out value="test"/>
</c:when>

where "doc" is my bean that has the "documentType" variable. I have verified that the value is "1" using a <c:out value="${doc.documentType}"/> statement right before the comparison.

The only solution I have found is to have a method that converts the Character to String and returns it but I am wondering if there is any other solution.

Thank you.
0
Comment
Question by:girionis
  • 6
  • 4
  • 2
  • +1
14 Comments
 
LVL 13

Expert Comment

by:copyPasteGhost
ID: 10842184
is it a must that you use jtls

cause you can do the same with jsp

<%

while(doc.getDocumentType.equals("1")) {
   out.println("test");
}

%>

you might have to add this method to your java bean

public String getDocumentType() {
   return documentType;
}

that will work
cheers,
Ghost
0
 
LVL 35

Author Comment

by:girionis
ID: 10842509
Hello copyPasteGhost, yes your comment is a possible solution and I thought about that too but the whole application is using JSTL and I wouldn't want to break the design.I am looking for a JSTL-only solution, if there is any.
0
 
LVL 13

Expert Comment

by:copyPasteGhost
ID: 10842594
<c:when test="${doc.documentType() == '1'}">
     <c:out value="test"/>
</c:when>

maybe you need to call the method in your javabean

try that..note I added the () at the end of documentType
Ghost
0
 
LVL 27

Expert Comment

by:rrz
ID: 10843847
>looking for a JSTL-only solution, if there is any.    
So, I guess using a scriptet is cheating then. Anyway this the only way I could make it work.  

<%
   request.setAttribute("myC",new Character('x'));
%>
<c:choose>
<c:when test="${doc.documentType == requestScope.myC}">
     Yes
</c:when>
<c:otherwise>NoNoNo</c:otherwise>
</c:choose>
rrz
0
 
LVL 35

Author Comment

by:girionis
ID: 10844803
copyPasteGhost

> doc.documentType()

This fails as the property accessed should be a variable and not a method.

rrz@871311

yes scriplet is a possible solution as copyPasteGhost also suggested but I would like to only use JSTL. Any more thoughts?
0
 
LVL 13

Expert Comment

by:copyPasteGhost
ID: 10845963
you can do this..

<%
String myVar = myBean.getVar();
%>
<c:when test="${<%=myVar=> == '1'}">
     <c:out value="test"/>
</c:when>

that's kinda cheating...I know..
But that will work too :)
0
 
LVL 13

Expert Comment

by:copyPasteGhost
ID: 10845965
should be..
<%
String myVar = myBean.getVar();
%>
<c:when test="${<%=myVar%> == '1'}">
     <c:out value="test"/>
</c:when>
0
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LVL 7

Accepted Solution

by:
searlas earned 53 total points
ID: 10846408
I'd think one of these has to work:

<c:when test="${doc.documentType == 1}">
     <c:out value="test"/>
</c:when>

<c:when test="${doc.documentType == '49'}">
     <c:out value="test"/>
</c:when>

<c:when test="${doc.documentType == 49}">
     <c:out value="test"/>
</c:when>

(the 49 in the last two comes from casting the char '1' to a number - i.e. it's ASCII value)
0
 
LVL 27

Expert Comment

by:rrz
ID: 10847672
searlas  is right. His second and third  entries work for me.   rrz
0
 
LVL 35

Author Comment

by:girionis
ID: 10849220
I have to admin I never thought of using the ASCII value instead. Let me try it at work on Monday and I will get back to you :)
0
 
LVL 7

Expert Comment

by:searlas
ID: 10876613
rrz, thanks for confirming it works.

girionis, Did it work for you?

0
 
LVL 35

Author Comment

by:girionis
ID: 10876785
Hello searlas, sorry haven't tried it yet, my colleague found a work around and he changed it before I got to the office. I haven't forgotten the question though. When I have some time I will try it and I will let you know.

Regards
0
 
LVL 35

Author Comment

by:girionis
ID: 10877106
I just tried your second example and it and it works like a charm. Thank you :)
0
 
LVL 35

Author Comment

by:girionis
ID: 10877121
Actually I tried the third example and it works but I believe rrz@871311 so I take it the second one works as well.
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