set page on p:datatable - primefaces

Question

I've a datatable in primefaces and I want, when I add a row in it, view the last page of the datatable.
My .xhtml page is:
<h:form id=...>
...
<p:dataTable var="webTemplate" id="templateTable" widgetVar="tbl1"/>
...
</h:form>
<h:form id=...>
...
<p:inputText id="txt_description" value="#{templateController.templateDescription}" label="templateDescription">
<f:validateLength for="txt_name" minimum="1"/>
<p:ajax event="change"
listener="#{calculatePageTable.setPageTableTemplate}" onsuccess="setTabIndexTT()"/>
</p:inputText>
...
</h:form>
<script type="text/javascript">
function setTabIndexTT(){
tbl1.getPaginator().setPage(#{calculatePageTable.pageTableTemplate});
}
</script>
bean:
#ManagedBean
#SessionScoped
public class CalculatePageTable {
private int pageTableTemplate = 0;
private int pageTableField = 0;
public void setPageTableTemplate() {
final DataTable d = (DataTable) FacesContext.getCurrentInstance().getViewRoot()
.findComponent("form:templateTable");
pageTableTemplate = d.getPageCount() - 1;
}
public int getPageTableTemplate() {
return pageTableTemplate;
}
public void setPageTemplateField() {
final DataTable d = (DataTable) FacesContext.getCurrentInstance().getViewRoot()
.findComponent("detailsTable:webTemplateUpdateTable");
pageTableField = (d.getPageCount() - 1);
}
public int getPageTableField() {
return pageTableField;
}
}
But the js function setTabIndexTT() is never called by onsuccess ajax...
How do I can set last page of my datatable when adding a row?
Primefaces version is 3.1.1

Answer 1

In your managed bean you can try this code:
public void setPageDataTable() {
final DataTable d = (DataTable) FacesContext.getCurrentInstance().getViewRoot()
.findComponent("form:templateTable");
int first = 1;
if (d.getRowCount() % ROWS_DATATABLE == 0) {
first = (d.getRowCount() - ROWS_DATATABLE);
}
else
{
first = (d.getRowCount()/ROWS_DATATABLE)*ROWS_DATATABLE;
}
d.setFirst(first);
}
Call this method when you add a new row

Answer 2

if the datatable widgetVar is dataTableWidget then use this:
<script type="text/javascript">
$(document).ready(function () {
dataTableWidget.paginator.setPage(0);
});
</script>

Answer 3

I would do it without any JavaScript. Primefaces's datatable has a first attribute, which is the index of the first data to display.
<p:dataTable first="#{calculatePageTable.first}"/>
...
<p:commandButton value="Add a row" action="#{calculatePageTable.addRow}"/>
And your backing bean:
public class CalculatePageTable {
private int first = 1;
public int getFirst(){
return first;
}
public void addRow(){
// 1. your stuff for adding the row
...
// 2. switch to the row
first = getFirstRowOnLastPage();
}
private int getFirstRowOnLastPage(){
...
}
}

Answer 4

You could avoid the explicit ID in your code by using bindings:
xhtml:
<p:dataTable var="webTemplate" id="templateTable" widgetVar="tbl1" binding="#{calculatePageTable.dataTable" />
bean:
public class CalculatePageTable {
private DataTable dataTable;
public DataTable getDataTable() {
return dataTable;
}
public void setDataTable(DataTable dataTable) {
this.dataTable = dataTable;
}
/* See Teg's answer */
public void setPageDataTable() {
int first = 1;
if (dataTable.getRowCount() % ROWS_DATATABLE == 0) {
first = (dataTable.getRowCount() - ROWS_DATATABLE);
}
else
{
first = (dataTable.getRowCount()/ROWS_DATATABLE)*ROWS_DATATABLE;
}
dataTable.setFirst(first);
}
}