RE: Generating struts tags from a Java Bean
These tags are going to be reused many times throughout our application, and
I prefer to omit this type of decision logic from the jsp pages. Therefore I
think it pays to design custom tags to accomplish what I need.
I have been looking at some of the source code for the various tag handlers
that extend BaseTagHandler, and I see there is a lot going on. I would like
to make sure to leverage all of the functionality included in
BaseTagHandler.
I was wondering if there is some documentation out there for creating new
BaseTagHandler extensions, or custom Struts HTML components in general.
I understand how to create taglibs in general, I am asking whether there is
such specific documentation for Struts.
Much thanks/Victor Grazi
-Original Message-
From: Craig McClanahan [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 4:42 PM
To: Struts Users Mailing List; [EMAIL PROTECTED]
Subject: Re: Generating struts tags from a Java Bean
The standard struts-example webapp has a case of conditional rendering as
well. The registration.jsp page is used for both Create a New User and
Log In As Existing User., but only in the latter case does it show the
table at the bottom. This is controlled by the following tag around the
table:
logic:equal name=RegistrationForm property=action
scope=request value=Edit
...
/logic:equal
which makes sure that the action property on the RegistrationForm
bean equals Edit before displaying the table.
Craig
On Tue, 17 Aug 2004 16:13 -0400, Victor Grazi [EMAIL PROTECTED] wrote:
The custom tag approach seems like the way to go. Is there any
documentation for considerations besides just perusing the source code
for exisiting html tags?
Regards
Victor
... Original Message ...
On Tue, 17 Aug 2004 10:53:29 -0700 Jim Barrows [EMAIL PROTECTED]
wrote:
-Original Message-
From: Victor Grazi [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 10:35 AM
To: Struts Users Mailing List
Subject: RE: Generating struts tags from a Java Bean
the problem we are trying to solve is that depending on user
entitlements and application state, some fields need to either be a
drop down or just text.
What I would suggest then, is to figure that out in your action
class, and
pass boolean values as part of the form bean. Then on the jsp page,
use logic:equal or c:if to determine what to show.
Alternatively you could write your own tag library for the field,
which
would figure out what html to generate based on the attributes you give
it.
Something like:
myCompany:inputField value=${formName.fieldName}
applicationState=${applicationState}/
You can of course get a list of roles from isUserInRole(), or hand
them in if your doing
something else.
If you have only 1 or 2 pages, then the first option may be easier,
but if you're doing it a
lot then the taglib option might be better.
___
Sent with SnapperMail
www.snappermail.com
.. Original Message ...
On Tue, 17 Aug 2004 09:46:49 -0700 Jim Barrows
[EMAIL PROTECTED] wrote:
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 9:42 AM
To: Struts Users Mailing List
Subject: Generating struts tags from a Java Bean
I would like to generate struts tags from a Java bean, which
would decide what tags to generate based on context.
Is there any way to configure the JSP so that it will evaluate
the JavaBean first, before the struts tags, so that the struts
tags can be generated by the beans?
I don't believe so. Since struts tags only generate html,
you could have
beans that generate html based on context. However, given that
struts and jstl have some rather powerful logical statements, you
might be able to achieve what you want without doing away with
struts tags, which is what you are basically asking.
What problem are you trying to solve?
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Re: Generating struts tags from a Java Bean
Jim Barrows wrote: -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 17, 2004 9:42 AM To: Struts Users Mailing List Subject: Generating struts tags from a Java Bean I would like to generate struts tags from a Java bean, which would decide what tags to generate based on context. Is there any way to configure the JSP so that it will evaluate the JavaBean first, before the struts tags, so that the struts tags can be generated by the beans? I don't believe so. Since struts tags only generate html, you could have beans that generate html based on context. However, given that struts and jstl have some rather powerful logical statements, you might be able to achieve what you want without doing away with struts tags, which is what you are basically asking. The JSP page is read and the tags there are used to do whatever is required to respond to a call to that page. Usually that is writing a JSP page. While you cannot use the struts tags between the JSP page and the ultimate HTML page, you can do something like that with code in the background. So, instead of dynamically generating Struts tags as follows: JSP page your tags JSP page struts tags - HTML page html tags You could somewhat easily work up something like the following: JSP page your tags Model Use of struts tags logic to generate HTML page html tags from your tags That clear? Michael - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Generating struts tags from a Java Bean
Victor Grazi wrote: These tags are going to be reused many times throughout our application, and I prefer to omit this type of decision logic from the jsp pages. Therefore I think it pays to design custom tags to accomplish what I need. I have been looking at some of the source code for the various tag handlers that extend BaseTagHandler, and I see there is a lot going on. I would like to make sure to leverage all of the functionality included in BaseTagHandler. I was wondering if there is some documentation out there for creating new BaseTagHandler extensions, or custom Struts HTML components in general. I understand how to create taglibs in general, I am asking whether there is such specific documentation for Struts. Much thanks/Victor Grazi My experience is that the easiest, fastest and best thing to do is to look through the source code of the struts tags. The tags are actually fairly simple coding. Michael - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Generating struts tags from a Java Bean
Not exactly; can you elaborate the step Model Use of struts tags logic to generate -Original Message- From: Michael McGrady [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 18, 2004 11:15 AM To: Struts Users Mailing List Subject: Re: Generating struts tags from a Java Bean The JSP page is read and the tags there are used to do whatever is required to respond to a call to that page. Usually that is writing a JSP page. While you cannot use the struts tags between the JSP page and the ultimate HTML page, you can do something like that with code in the background. So, instead of dynamically generating Struts tags as follows: JSP page your tags JSP page struts tags - HTML page html tags You could somewhat easily work up something like the following: JSP page your tags Model Use of struts tags logic to generate HTML page html tags from your tags That clear? Michael - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Generating struts tags from a Java Bean
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 17, 2004 9:42 AM To: Struts Users Mailing List Subject: Generating struts tags from a Java Bean I would like to generate struts tags from a Java bean, which would decide what tags to generate based on context. Is there any way to configure the JSP so that it will evaluate the JavaBean first, before the struts tags, so that the struts tags can be generated by the beans? I don't believe so. Since struts tags only generate html, you could have beans that generate html based on context. However, given that struts and jstl have some rather powerful logical statements, you might be able to achieve what you want without doing away with struts tags, which is what you are basically asking. What problem are you trying to solve? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Generating struts tags from a Java Bean
the problem we are trying to solve is that depending on user entitlements and application state, some fields need to either be a drop down or just text. ___ Sent with SnapperMail www.snappermail.com .. Original Message ... On Tue, 17 Aug 2004 09:46:49 -0700 Jim Barrows [EMAIL PROTECTED] wrote: -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 17, 2004 9:42 AM To: Struts Users Mailing List Subject: Generating struts tags from a Java Bean I would like to generate struts tags from a Java bean, which would decide what tags to generate based on context. Is there any way to configure the JSP so that it will evaluate the JavaBean first, before the struts tags, so that the struts tags can be generated by the beans? I don't believe so. Since struts tags only generate html, you could have beans that generate html based on context. However, given that struts and jstl have some rather powerful logical statements, you might be able to achieve what you want without doing away with struts tags, which is what you are basically asking. What problem are you trying to solve? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Generating struts tags from a Java Bean
On Tue, 17 Aug 2004 13:35 -0400, Victor Grazi [EMAIL PROTECTED] wrote: the problem we are trying to solve is that depending on user entitlements and application state, some fields need to either be a drop down or just text. The underlying problem isn't really Struts related ... you're trying to dynamically create a JSP page and then get it compiled and executed, and that's not supported by JSP. Instead, you'll need to use some other technique. The most common approach for solving this particular problem is to surround the conditional fields with something like logic:equals (if using Struts conditional tags) or c:if (if using JSTL), and use an expression that tests whether this particular user should see this particular field. Craig - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Generating struts tags from a Java Bean
The custom tag approach seems like the way to go. Is there any
documentation for considerations besides just perusing the source code for
exisiting html tags?
Regards
Victor
.. Original Message ...
On Tue, 17 Aug 2004 10:53:29 -0700 Jim Barrows [EMAIL PROTECTED] wrote:
-Original Message-
From: Victor Grazi [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 10:35 AM
To: Struts Users Mailing List
Subject: RE: Generating struts tags from a Java Bean
the problem we are trying to solve is that depending on user
entitlements
and application state, some fields need to either be a drop
down or just
text.
What I would suggest then, is to figure that out in your action class, and
pass boolean values as part of the form bean. Then on the jsp page, use
logic:equal or c:if to determine what to show.
Alternatively you could write your own tag library for the field, which
would figure out what html to generate based on the attributes you give it.
Something like:
myCompany:inputField value=${formName.fieldName}
applicationState=${applicationState}/
You can of course get a list of roles from isUserInRole(), or hand them in if your
doing
something else.
If you have only 1 or 2 pages, then the first option may be easier, but if you're
doing it a
lot then the taglib option might be better.
___
Sent with SnapperMail
www.snappermail.com
.. Original Message ...
On Tue, 17 Aug 2004 09:46:49 -0700 Jim Barrows
[EMAIL PROTECTED] wrote:
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 9:42 AM
To: Struts Users Mailing List
Subject: Generating struts tags from a Java Bean
I would like to generate struts tags from a Java bean, which
would decide
what tags to generate based on context.
Is there any way to configure the JSP so that it will evaluate the
JavaBean first, before the struts tags, so that the struts
tags can be
generated by the beans?
I don't believe so. Since struts tags only generate html,
you could have
beans that generate html based on context. However, given
that struts and
jstl have some rather powerful logical statements, you might
be able to
achieve what you want without doing away with struts tags,
which is what
you are basically asking.
What problem are you trying to solve?
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
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RE: Generating struts tags from a Java Bean
-Original Message-
From: Victor Grazi [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 1:13 PM
To: [EMAIL PROTECTED]
Subject: RE: Generating struts tags from a Java Bean
The custom tag approach seems like the way to go. Is there any
documentation for considerations besides just perusing the
source code for
exisiting html tags?
There's a real nice tutorial on the java.sun.com site.
Regards
Victor
.. Original Message ...
On Tue, 17 Aug 2004 10:53:29 -0700 Jim Barrows
[EMAIL PROTECTED] wrote:
-Original Message-
From: Victor Grazi [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 10:35 AM
To: Struts Users Mailing List
Subject: RE: Generating struts tags from a Java Bean
the problem we are trying to solve is that depending on user
entitlements
and application state, some fields need to either be a drop
down or just
text.
What I would suggest then, is to figure that out in your
action class, and
pass boolean values as part of the form bean. Then on the
jsp page, use
logic:equal or c:if to determine what to show.
Alternatively you could write your own tag library for the
field, which
would figure out what html to generate based on the
attributes you give it.
Something like:
myCompany:inputField value=${formName.fieldName}
applicationState=${applicationState}/
You can of course get a list of roles from isUserInRole(),
or hand them in if your doing
something else.
If you have only 1 or 2 pages, then the first option may be
easier, but if you're doing it a
lot then the taglib option might be better.
___
Sent with SnapperMail
www.snappermail.com
.. Original Message ...
On Tue, 17 Aug 2004 09:46:49 -0700 Jim Barrows
[EMAIL PROTECTED] wrote:
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 17, 2004 9:42 AM
To: Struts Users Mailing List
Subject: Generating struts tags from a Java Bean
I would like to generate struts tags from a Java bean, which
would decide
what tags to generate based on context.
Is there any way to configure the JSP so that it will
evaluate the
JavaBean first, before the struts tags, so that the struts
tags can be
generated by the beans?
I don't believe so. Since struts tags only generate html,
you could have
beans that generate html based on context. However, given
that struts and
jstl have some rather powerful logical statements, you might
be able to
achieve what you want without doing away with struts tags,
which is what
you are basically asking.
What problem are you trying to solve?
-
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For additional commands, e-mail: [EMAIL PROTECTED]
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