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Posted to users@myfaces.apache.org by No Galz <an...@yahoo.com> on 2004/11/19 13:04:00 UTC

Struts and my faces

Hello myfaces users,

I need an advice. I have a big application which is
completely struts based. But i would like to use the
JSF components (myfaces imple.) with my present struts
based app. 

Question) Is it possible to integrate the JSF+Struts
with myfaves impl. using the JSF+Struts integration
library??

Thanks in advance.

Regards
fargo


		
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Re: populate resultSet

Posted by Francesco Consumi <co...@istitutodeglinnocenti.it>.

Scrive Manfred Geiler <ma...@apache.org>:
....snip.....

many thanks for explainations. Now it is clear.

For the moment I've solved problem calling the "populate()" method inside the
action param of Save button.
But I keep searching a more general solution. I've a lot of dataTables without
filters, but that have to be filled just before showing......






--
Francesco Consumi
Ufficio Sistemi informativi
Istituto degli Innocenti
Piazza SS.Annunziata, 12
50122 Firenze
consumi at istitutodeglinnocenti.it
Tel. +39 055 2037320
ICQ# 12516133

Re: populate resultSet

Posted by Manfred Geiler <ma...@apache.org>.

There is a problem with rendered="#{bean.list.count > 0}" (or better 
rendered="#{not empty bean.list}") for a dataTable in principle:
Imagine the following scenario:
- We have a list page with some kind of filter criterias in a form
- The first time the page is rendered with an empty list
- After a submit the page is rendered again. Per definition the rendered 
attribute is calculated early during the first lifecycle phase. Should 
we refresh the list before the restore state or apply request values phase?
--> if yes, we would refresh the list from the DB with wrong query 
criterias, because the filter inputs have not yet been propagated to the 
model beans (this happens in updateModel phase).
--> if no, we use the old list (which is still empty) and the rendered 
attribute evaluates to false. That means our list component does not 
participate in lifecycle processing at all. So, the new filter criterias 
would perhaps give a non-empty list, but the list would not be rendered.

A stand-off situation!
Conclusion: In a situation where inputs on the page influence the size 
of the list (i.e. filter form inputs), never use the rendered attibute 
in a dataTable to determine if the list is empty or not empty.

HTH,
Manfred


Francesco Consumi wrote:
> Scrive Manfred Geiler <ma...@apache.org>:
> 
>> This is the culprit:  rendered="#{mb.rsTelxSett.count > 0}"
>> Please use the renderedIfEmpty attribute instead:
>>
> I've just tried, and for some aspects it works: the getList method is being
> called  "only" times... :-)
> 
> the better place, I think, should be an hypothetical "OnPageLoad" 
> action.......
> 
> 
> 
> 
> 
> -- 
> Francesco Consumi
> Ufficio Sistemi informativi
> Istituto degli Innocenti
> Piazza SS.Annunziata, 12
> 50122 Firenze
> consumi at istitutodeglinnocenti.it
> Tel. +39 055 2037320
> ICQ# 12516133
> 
> 
>

Re: populate resultSet

Posted by Francesco Consumi <co...@istitutodeglinnocenti.it>.

Scrive Manfred Geiler <ma...@apache.org>:

> This is the culprit:  rendered="#{mb.rsTelxSett.count > 0}"
> Please use the renderedIfEmpty attribute instead:
>
I've just tried, and for some aspects it works: the getList method is being
called  "only" times... :-)

the better place, I think, should be an hypothetical "OnPageLoad" 
action.......





--
Francesco Consumi
Ufficio Sistemi informativi
Istituto degli Innocenti
Piazza SS.Annunziata, 12
50122 Firenze
consumi at istitutodeglinnocenti.it
Tel. +39 055 2037320
ICQ# 12516133

Re: populate resultSet

Posted by Manfred Geiler <ma...@apache.org>.

This is the culprit:  rendered="#{mb.rsTelxSett.count > 0}"
Please use the renderedIfEmpty attribute instead:

Excerpt from the TLD:
8X-------------------------------------------------------
<attribute>
             <name>renderedIfEmpty</name>
             <required>false</required>
             <rtexprvalue>false</rtexprvalue>
             <description>
                 Indicates whether this table should be rendered if the 
underlying DataModel is
                 empty.
                 You could as well use rendered="#{not empty 
bean.list}", but this one causes
                 the getList method of your model bean beeing called up 
to five times per
                 request, which is not optimal when the list is backed 
by a DB table.
                 Using renderedIfEmpty="false" solves this problem, 
because the MyFaces
                 extended HtmlDataTable automatically caches the 
DataModel and calles the
                 model getter only once per request.
                 Default: true
             </description>
         </attribute>
8X-------------------------------------------------------

HTH,
Manfred



Francesco Consumi wrote:
> Scrive Manfred Geiler <ma...@apache.org>:
> 
>> Francesco,
>> Just place your "populate()" call into your getList method, use the
>> <x:dataTable> instead of <h:dataTable>, set the "preserveData" attribute
>> to true and lean back. ;-)
>> There is some (not yet neatly documented) magic inside the extended data
>> table that makes the component do call your getList method only once per
>> request.
> 
> 
> Thanks, but I'm sorry to inform you that even if I use x:dataTable, the
> "getList" method is being called at least 8 (eight) times....
> 
> here is the dataTable code:
> "result" is the ArrayList populated. I've to populate it at every page 
> request
> because its query depends on some parameters that the user can select in 
> form
> in order to filter result set.
> 
> 
>            <x:dataTable var="g" value="#{mb.rsTelxSett.result}"
>                         styleClass="standardTable"
>                         headerClass="standardTable_SortHeader"
>                         footerClass="standardTable_Footer"
> 
> columnClasses="standardTable_Column,standardTable_Column,standardTable_Column,standardTable_ColumnRight,standardTable_ColumnRight" 
> 
>                         rendered="#{mb.rsTelxSett.count > 0}"
>                         preserveDataModel="true">
>              <f:facet name="header">
>                <h:panelGroup>
>                  <h:outputText value="Statistiche telefono"/>
>                </h:panelGroup>
>              </f:facet>
>              <h:column id="c0">
>                <f:facet name="header"><h:outputText value="Utente"
> id="h0"/></f:facet>
>                <h:outputText value="#{g.COGNOMENOME}" id="c1Text0"/>
>              </h:column>
>              <h:column id="c1">
>                <f:facet name="header"><h:outputText value="Codice"
> id="h1"/></f:facet>
>                <h:outputText value="#{g.CODICE}" id="c1Text"/>
>              </h:column>
>              <h:column id="c2">
>                <f:facet name="header"><h:outputText value="Centro di Costo"
> id="h2"/></f:facet>
>                <h:outputText value="#{g.NOME}" id="c1Text2"/>
>              </h:column>
>              <h:column id="c3">
>                <f:facet name="header"><h:outputText value="Scatti"
> id="h3"/></f:facet>
>                <h:outputText value="#{g.TOT}" id="c1Text3"/>
>              </h:column>
>              <h:column id="c4">
>                <f:facet name="header"><h:outputText value="Costo totale"
> id="h4"/></f:facet>
>                <h:outputText value="#{g.COSTOTOT}" id="c1Text4">
>                  <f:convertNumber type="currency"/>
>                </h:outputText>
>              </h:column>
>            </x:dataTable>
> 
> 
> 
> many thanks for support.
> 
> -- 
> Francesco Consumi
> Ufficio Sistemi informativi
> Istituto degli Innocenti
> Piazza SS.Annunziata, 12
> 50122 Firenze
> consumi at istitutodeglinnocenti.it
> Tel. +39 055 2037320
> ICQ# 12516133
> 
> 
>

Re: populate resultSet

Posted by Francesco Consumi <co...@istitutodeglinnocenti.it>.

Scrive Manfred Geiler <ma...@apache.org>:

> Francesco,
> Just place your "populate()" call into your getList method, use the
> <x:dataTable> instead of <h:dataTable>, set the "preserveData" attribute
> to true and lean back. ;-)
> There is some (not yet neatly documented) magic inside the extended data
> table that makes the component do call your getList method only once per
> request.

Thanks, but I'm sorry to inform you that even if I use x:dataTable, the
"getList" method is being called at least 8 (eight) times....

here is the dataTable code:
"result" is the ArrayList populated. I've to populate it at every page request
because its query depends on some parameters that the user can select in form
in order to filter result set.


            <x:dataTable var="g" value="#{mb.rsTelxSett.result}"
                         styleClass="standardTable"
                         headerClass="standardTable_SortHeader"
                         footerClass="standardTable_Footer"

columnClasses="standardTable_Column,standardTable_Column,standardTable_Column,standardTable_ColumnRight,standardTable_ColumnRight"
                         rendered="#{mb.rsTelxSett.count > 0}"
                         preserveDataModel="true">
              <f:facet name="header">
                <h:panelGroup>
                  <h:outputText value="Statistiche telefono"/>
                </h:panelGroup>
              </f:facet>
              <h:column id="c0">
                <f:facet name="header"><h:outputText value="Utente"
id="h0"/></f:facet>
                <h:outputText value="#{g.COGNOMENOME}" id="c1Text0"/>
              </h:column>
              <h:column id="c1">
                <f:facet name="header"><h:outputText value="Codice"
id="h1"/></f:facet>
                <h:outputText value="#{g.CODICE}" id="c1Text"/>
              </h:column>
              <h:column id="c2">
                <f:facet name="header"><h:outputText value="Centro di Costo"
id="h2"/></f:facet>
                <h:outputText value="#{g.NOME}" id="c1Text2"/>
              </h:column>
              <h:column id="c3">
                <f:facet name="header"><h:outputText value="Scatti"
id="h3"/></f:facet>
                <h:outputText value="#{g.TOT}" id="c1Text3"/>
              </h:column>
              <h:column id="c4">
                <f:facet name="header"><h:outputText value="Costo totale"
id="h4"/></f:facet>
                <h:outputText value="#{g.COSTOTOT}" id="c1Text4">
                  <f:convertNumber type="currency"/>
                </h:outputText>
              </h:column>
            </x:dataTable>



many thanks for support.

--
Francesco Consumi
Ufficio Sistemi informativi
Istituto degli Innocenti
Piazza SS.Annunziata, 12
50122 Firenze
consumi at istitutodeglinnocenti.it
Tel. +39 055 2037320
ICQ# 12516133