You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@struts.apache.org by Wendy Smoak <We...@asu.edu> on 2002/10/08 20:46:42 UTC
Do something when null _or_ blank?
I just wrote this:
<logic:notEqual name="resView" property="personBirthDate" value="">
<bean:write name="resView" property="personBirthDate" />
</logic:notEqual>
<logic:equal name="resView" property="personBirthDate" value="">
--
</logic:equal>
What I really need is to print out the birthDate property if it's not blank
and not null, otherwise, print the '--'. Can I combine notEqual and
present? [implied question: HOW?]
Also, the above seems to me the equivalent of writing:
if ( something.equals("") )
//do one thing;
if ( !something.equals("") )
System.out.println(something);
which is downright PAINFUL to look at.
I tried to look at the generated JSP, but I couldn't find the translation of
the logic:equal/notEqual tags in there. I guess I just want to know that
the code isn't calling resView.getPersonBirthDate() multiple times. Can I
rest assured that the generated code is as efficient as possible?
Any suggestions appreciated!
--
Wendy Smoak
http://sourceforge.net/projects/unidbtags
Re: Do something when null _or_ blank?
Posted by John Owen <jo...@hotmail.com>.
Maybe you should use <logic:greaterThan name="resView"
property="personBirthDate" value="">.
----- Original Message -----
From: "Wendy Smoak" <We...@asu.edu>
To: "'Struts Users Mailing List'" <st...@jakarta.apache.org>
Sent: Tuesday, October 08, 2002 1:46 PM
Subject: Do something when null _or_ blank?
>
> I just wrote this:
>
> <logic:notEqual name="resView" property="personBirthDate" value="">
> <bean:write name="resView" property="personBirthDate" />
> </logic:notEqual>
> <logic:equal name="resView" property="personBirthDate" value="">
> --
> </logic:equal>
>
> What I really need is to print out the birthDate property if it's not
blank
> and not null, otherwise, print the '--'. Can I combine notEqual and
> present? [implied question: HOW?]
>
> Also, the above seems to me the equivalent of writing:
>
> if ( something.equals("") )
> //do one thing;
>
> if ( !something.equals("") )
> System.out.println(something);
>
> which is downright PAINFUL to look at.
>
> I tried to look at the generated JSP, but I couldn't find the translation
of
> the logic:equal/notEqual tags in there. I guess I just want to know that
> the code isn't calling resView.getPersonBirthDate() multiple times. Can I
> rest assured that the generated code is as efficient as possible?
>
> Any suggestions appreciated!
>
> --
> Wendy Smoak
> http://sourceforge.net/projects/unidbtags
>
--
To unsubscribe, e-mail: <ma...@jakarta.apache.org>
For additional commands, e-mail: <ma...@jakarta.apache.org>
Re: Do something when null _or_ blank?
Posted by Kris Schneider <kr...@dotech.com>.
Wendy,
If you're using a JSP 1.2 container, you might want to check out JSTL:
<c:choose>
<c:when test="${empty resView.personBirthDate}">
--
</c:when>
<c:otherwise>
<c:out value="${resView.personBirthDate}"/>
</c:otherwise>
</c:choose>
Or even just:
<c:out value="${resView.personBirthDate}" default="--"/>
The difference is that the second approach makes a distinction between the
empty string and null (I think). This is from memory, but you get the idea...
Quoting Wendy Smoak <We...@asu.edu>:
>
> I just wrote this:
>
> <logic:notEqual name="resView" property="resView" value="">
> <bean:write name="resView" property="personBirthDate" />
> </logic:notEqual>
> <logic:equal name="resView" property="personBirthDate" value="">
> --
> </logic:equal>
>
> What I really need is to print out the birthDate property if it's not blank
> and not null, otherwise, print the '--'. Can I combine notEqual and
> present? [implied question: HOW?]
>
> Also, the above seems to me the equivalent of writing:
>
> if ( something.equals("") )
> //do one thing;
>
> if ( !something.equals("") )
> System.out.println(something);
>
> which is downright PAINFUL to look at.
>
> I tried to look at the generated JSP, but I couldn't find the translation
> of
> the logic:equal/notEqual tags in there. I guess I just want to know that
> the code isn't calling resView.getPersonBirthDate() multiple times. Can I
> rest assured that the generated code is as efficient as possible?
>
> Any suggestions appreciated!
>
> --
> Wendy Smoak
> http://sourceforge.net/projects/unidbtags
>
--
Kris Schneider <ma...@dotech.com>
D.O.Tech <http://www.dotech.com/>
--
To unsubscribe, e-mail: <ma...@jakarta.apache.org>
For additional commands, e-mail: <ma...@jakarta.apache.org>