Setting Tag Attribute Value

[Sundar Chakravarthy <sc...@doas.ga.gov>]

Hi,

I am on Tomcat 4.0.x , jdk1.4,win2K.

When I try to set a tag attribute value using
a jsp script varaible like below ,

inc= "<%= path %>/jsp/dd/inc/" 

the value of path shows up as null . Why ?

Thanks




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Re: Setting Tag Attribute Value

[Jeff <li...@skubick.com>]

OK, quick question... is <%= path %> ***itself*** null, or it simply
being ---interpreted--- by Tomcat as null in the context of a tag attribute?

An easy way to check is to stick a copy somewhere inside a html comment
adjacent to the tag where you're using it so you can launch the page and see
for sure. For example...

<!-- VALUE of path = '<%= path %>' -->
... inc="<%= path %>/jsp/dd/inc" ...

if <%= path %> is itself null and is itself supposed to be set by another
tag either wrapping it or coming earlier in the page, it's probably a
problem with that tag's TEI file.

On the other hand, if <%= path %> is non-null, check the tag's .tld file and
make sure that the "inc" attribute has <rtexprvalue>true</rtexprvalue>

"rtexprvalue" tells the compiler whether it can save time and hardcode the
current value of <%= path %> at ***compile time***, or whether it needs to
stop and fetch the current value of <%= path %> at ---runtime---. If
rtexprvalue is false, it's using path's value at compile time... which more
likely than not, is null.

----- Original Message -----
From: "Sundar Chakravarthy" <sc...@doas.ga.gov>
To: "Tomcat Users List" <to...@jakarta.apache.org>
Sent: Wednesday, September 25, 2002 1:23 PM
Subject: Setting Tag Attribute Value


Hi,

I am on Tomcat 4.0.x , jdk1.4,win2K.

When I try to set a tag attribute value using
a jsp script varaible like below ,

inc= "<%= path %>/jsp/dd/inc/"

the value of path shows up as null . Why ?

Thanks




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