Hi Jeff,
I found another approach to maintain the page the user is at. I am using
the actionListener attribute of the dataScroller.
In my xhtml page I have the following:
*************************XHTML CODE PORTION*****************************
<t:dataScroller id="scroll_1"
for="resultsData" fastStep="#{searchResultsBean.fastStep}"
pageCountVar="pageCount"
pageIndexVar="pageIndex"
styleClass="scroller"
paginator="true" paginatorMaxPages="#{searchResultsBean.paginatorMaxPages}"
paginatorTableClass="paginator"
paginatorActiveColumnStyle="font-weight:bold;"
immediate="false"
rowsCountVar="totalRows"
firstRowIndexVar="currentPageFirstRow"
lastRowIndexVar="currentPageLastRow"
renderFacetsIfSinglePage="false"
actionListener="#{searchResultsBean.paginatorAction}">
<h:outputFormat value="Rows {0}-{1}
of {2}" style="align:center">
<f:param
name="mycurrentPageFirstRow" value="#{currentPageFirstRow}"/>
<f:param
name="mycurrentPageLastRow" value="#{currentPageLastRow}"/>
<f:param name="mytotalRows"
value="#{totalRows}"/>
</h:outputFormat>
<f:facet name="first">
<t:graphicImage
url="/pages/images/arrow-first.gif" style="border:1px"
rendered="#{!searchResultsBean.firstPage}"/>
</f:facet>
<f:facet name="last">
<t:graphicImage
url="/pages/images/arrow-last.gif" style="border:1px"
rendered="#{!searchResultsBean.lastPage}"/>
</f:facet>
<f:facet name="previous">
<t:graphicImage
url="/pages/images/arrow-previous.gif" style="border:1px"
rendered="#{!searchResultsBean.firstPage}"/>
</f:facet>
<f:facet name="next">
<t:graphicImage
url="/pages/images/arrow-next.gif" style="border:1px"
rendered="#{!searchResultsBean.lastPage}"/>
</f:facet>
<f:facet name="fastforward">
<t:graphicImage
url="/pages/images/arrow-ff.gif" style="border:1px"
rendered="#{!searchResultsBean.lastPage}"/>
</f:facet>
<f:facet name="fastrewind">
<t:graphicImage
url="/pages/images/arrow-fr.gif" style="border:1px"
rendered="#{!searchResultsBean.firstPage}"/>
</f:facet>
</t:dataScroller>
****************************************************************************
In the managed bean I have the following relevant code:
**************************MANAGED BEAN CODE PORTION*************************
private final static int DEFAULT_ROWS = 2;
private final static int PAGINATOR_MAX_PAGES = 5;
private final static int PAGINATOR_FAST_STEP = 5;
private int rowIndex = 0;
private int rowsPerPage = DEFAULT_ROWS;
public void paginatorAction(ActionEvent event) {
ScrollerActionEvent scrollerAction = (ScrollerActionEvent)
event;
String clickedFacet = scrollerAction.getScrollerfacet();
int pageClicked = scrollerAction.getPageIndex();
//Means a facet was clicked
if (clickedFacet != null) {
if (clickedFacet.equals("next")) {
rowIndex = rowIndex + rowsPerPage;
} else if (clickedFacet.equals("previous")) {
rowIndex = rowIndex - rowsPerPage;
} else if (clickedFacet.equals("first")) {
rowIndex = 0;
} else if (clickedFacet.equals("last")) {
rowIndex = _rowData.getRowCount() -
rowsPerPage;
} else if (clickedFacet.equals("fastrewind")) {
rowIndex = rowIndex -
PAGINATOR_FAST_STEP*rowsPerPage;
if (rowIndex < 0) {
rowIndex = 0;
}
} else if (clickedFacet.equals("fastforward")) {
rowIndex = rowIndex +
PAGINATOR_FAST_STEP*rowsPerPage;
if (rowIndex >= _rowData.getRowCount()) {
rowIndex = _rowData.getRowCount() -
rowsPerPage;
}
}
} else {
//Means a pageNumber was clicked
rowIndex = pageClicked*rowsPerPage - rowsPerPage;
}
}
public int getRowIndex() {
return rowIndex;
}
public int getRowsPerPage() {
return SearchResultsBean.DEFAULT_ROWS;
}
public boolean isFirstPage() {
return (rowIndex < rowsPerPage);
}
public boolean isLastPage() {
return (rowIndex >= (_rowData.getRowCount() - rowsPerPage));
}
public int getFastStep() {
return SearchResultsBean.PAGINATOR_FAST_STEP;
}
public int getPaginatorMaxPages() {
return SearchResultsBean.PAGINATOR_MAX_PAGES;
}
****************************************************************************
The most important method here is: paginatorAction which captures all
scrollerActionEvents and according to the type of element clicked (either a
facet or a specific page) it displaces the rowIndex variable accordingly.
Also, I added conditional rendering to the facets based on whether the user
is at the first or last page. If the user is at the first page there´s no
need to include first, previous and fastrewind facets and if the user is at
the last page there´s no need to include last, next and fastforward facets.
I haven´t included anything yet in the wiki but if you guys think this can
be helpful information to others then let me know and I´ll add it to the
wiki.
Regards,
JV
-----Mensaje original-----
De: Jorge Vásquez [mailto:[EMAIL PROTECTED]
Enviado el: martes, 21 de noviembre de 2006 16:21
Para: 'MyFaces Discussion'
Asunto: RE: Accessing datascroller paginator variables
Thanks a lot Jeff. Excelent document!! My problem is that I am not using
command Links to view the details. I have context menus for each row that
are built using the jscookMenu component. I think that I should take a
closer look at the second approach that you suggest.
Thanks again,
JV
-----Mensaje original-----
De: Jeff Bischoff [mailto:[EMAIL PROTECTED]
Enviado el: martes, 21 de noviembre de 2006 11:15
Para: MyFaces Discussion
Asunto: Re: Accessing datascroller paginator variables
Jorge,
I have contributed a wiki page [1] with my take on solving this
scenario. Please let me know if anything is lacking, or feel free to
edit the wiki yourself. :)
[1] http://wiki.apache.org/myfaces/ManagingDataScrollerPage
Regards,
Jeff Bischoff
Kenneth L Kurz & Associates, Inc.
Jorge Vásquez wrote:
Hi list,
I am using dataScroller for paginating a list. I would like to have
access
to the current page in the bean in order to load it whenever a user
returns
to a list that was previously loaded. My scenario is the user is loading
a
set of detail pages and when he/she comes back to the list it isn´t
loading
the page that he/she was at prior to going to the detail pages. So I was
thinking if I can keep the current page in the bean but continue using
datascroller since I don´t want to reimplement all the pagination logic
that
this component already provides.
Thanks,
JV
