Re: Accessing action properties from JSPs

2015-10-04 Thread Lukasz Lenart 
2015-10-03 17:50 GMT+02:00 Christopher Schultz :
> Is this the latest wisdom for accessing action properties from JSPs
> using EL?
>
> https://struts.apache.org/docs/access-to-valuestack-from-jsps.html
>
> So if my action has a "public String getItems)" method, I'd like to do
> something as close as possible to this:
>
> 
> 
>
> It looks like I can do this very quickly:
>
> <%@ taglib uri="http://java.sun.com/jsp/jstl/core; prefix="c" %>
> <%@ taglib prefix="s" uri="/struts-tags" %>
> 
> 
> ...
> 
>
> Is there something I can do to bind "action" to the actual action
> instance?
>
> Or I can use the Struts 2 "iterate" tag:
>
> <%@ taglib prefix="s" uri="/struts-tags" %>
> 
> 
>
> I realize that this is a simple example, but is there a recommended
> technique, here? EL gives me the ability to do things like print
> values with somewhat less code: "${fn:escapeXml(foo)}" versus
> 
>
> In general, EL seems to be more universally understood, while the s2
> tags are a bit more specialized.
>
> Any suggestions are appreciated.

JSTL/EL are supported out-of-the-box

https://struts.apache.org/docs/can-we-use-jstl-with-the-framework.html

> (After writing all of the above and experimenting, I've found that I
> can reference ${items} in my JSP without doing anything with the
> Struts2 tags: no  required. How is that working? Does S2 export
> all my beans from the action (and other places?) to the request
> attributes?).

The magic happens in StrutsRequestWrapper (Struts wraps each request
with dedicated class). The wrapper first tries to fetch the attribute
from the original request, if not found, it will use ValueStack to
find the value.

https://github.com/apache/struts/blob/master/core/src/main/java/org/apache/struts2/dispatcher/StrutsRequestWrapper.java#L72-L104


Regards
-- 
Łukasz
+ 48 606 323 122 http://www.lenart.org.pl/

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Re: Accessing action properties from JSPs

2015-10-04 Thread Christopher Schultz 
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Hash: SHA256

Lukasz,

On 10/4/15 3:49 AM, Lukasz Lenart wrote:
> 2015-10-03 17:50 GMT+02:00 Christopher Schultz
> :
>> Is this the latest wisdom for accessing action properties from
>> JSPs using EL?
>> 
>> https://struts.apache.org/docs/access-to-valuestack-from-jsps.html
>>
>>
>> 
So if my action has a "public String getItems)" method, I'd like to do
>> something as close as possible to this:
>> 
>>  
>> 
>> It looks like I can do this very quickly:
>> 
>> <%@ taglib uri="http://java.sun.com/jsp/jstl/core; prefix="c" %> 
>> <%@ taglib prefix="s" uri="/struts-tags" %> > value="items" />  ... 
>> 
>> 
>> Is there something I can do to bind "action" to the actual
>> action instance?
>> 
>> Or I can use the Struts 2 "iterate" tag:
>> 
>> <%@ taglib prefix="s" uri="/struts-tags" %> > var="item" value="items"> 
>> 
>> I realize that this is a simple example, but is there a
>> recommended technique, here? EL gives me the ability to do things
>> like print values with somewhat less code: "${fn:escapeXml(foo)}"
>> versus 
>> 
>> In general, EL seems to be more universally understood, while the
>> s2 tags are a bit more specialized.
>> 
>> Any suggestions are appreciated.
> 
> JSTL/EL are supported out-of-the-box
> 
> https://struts.apache.org/docs/can-we-use-jstl-with-the-framework.html
>
> 
>> (After writing all of the above and experimenting, I've found
>> that I can reference ${items} in my JSP without doing anything
>> with the Struts2 tags: no  required. How is that working?
>> Does S2 export all my beans from the action (and other places?)
>> to the request attributes?).
> 
> The magic happens in StrutsRequestWrapper (Struts wraps each
> request with dedicated class). The wrapper first tries to fetch the
> attribute from the original request, if not found, it will use
> ValueStack to find the value.
> 
> https://github.com/apache/struts/blob/master/core/src/main/java/org/ap
ache/struts2/dispatcher/StrutsRequestWrapper.java#L72-L104

Thanks
> 
for the explanation. I'm very happy that this works... the
reference I provided at the top of my post suggests that working with
non-Struts2-provided tags could be difficult, but it hasn't been
difficult at all.

Thanks,
- -chris
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RE: Accessing action properties from JSPs

2015-10-03 Thread Martin Gainty 
> To: user@struts.apache.org
> From: ch...@christopherschultz.net
> Subject: Accessing action properties from JSPs
> Date: Sat, 3 Oct 2015 11:50:31 -0400
> 
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
> 
> All,
> 
> Is this the latest wisdom for accessing action properties from JSPs
> using EL?
> 
> https://struts.apache.org/docs/access-to-valuestack-from-jsps.html
> 
> So if my action has a "public String getItems)" method, I'd like to do
> something as close as possible to this:
> 
> 
> 
> 
> It looks like I can do this very quickly:
> 
> <%@ taglib uri="http://java.sun.com/jsp/jstl/core; prefix="c" %>
> <%@ taglib prefix="s" uri="/struts-tags" %>
> 
> 
> ...
> 
> 
> Is there something I can do to bind "action" to the actual action
> instance?
MG>the jsp is 'bound' inside struts-config.xml to parent 
https://struts.apache.org/docs/action-configuration.html
MG>if on the other hand you want to use a different method to execute then you 
can use DMI
https://cwiki.apache.org/confluence/display/WW/Action+Configuration#ActionConfiguration-DynamicMethodInvocation
> 
> Or I can use the Struts 2 "iterate" tag:
> 
> <%@ taglib prefix="s" uri="/struts-tags" %>
> 
> 
> 
> I realize that this is a simple example, but is there a recommended
> technique, here? EL gives me the ability to do things like print
> values with somewhat less code: "${fn:escapeXml(foo)}" versus
> 
> 
> In general, EL seems to be more universally understood, while the s2
> tags are a bit more specialized.
MG>s2 tag resolution provides access to struts value stack via OGNL 
expression(s)
> 
> Any suggestions are appreciated.
> 
> (After writing all of the above and experimenting, I've found that I
> can reference ${items} in my JSP without doing anything with the
> Struts2 tags: no  required. How is that working?
MG>in that case struts resolves this as a property placed on ValueStack
https://struts.apache.org/docs/tag-syntax.html

Does S2 export
> all my beans from the action (and other places?) to the request
> attributes?).
MG>if specified by scope attrib e.g. 
https://struts.apache.org/docs/set.html

> 
> Thanks,
> - -chris
MG>does that answer your understanding of struts-tags?

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