PrimeFaces rowIndexVar in a DataTable

[DGorges]

Hi, everyone.

I've passed throught this situation last week:

We have made this dataTable where we need some back bean method will be called when the user clicks on edit icon.
This method will make a database's call to get the list using a parameter from the dataTable's line.

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<h:form id="form">
	<p:outputPanel id="opVacinacoes">
		<div class="row">
			<div class="col-md-12">
				<p:dataTable id="dtVacinacoes" var="vacinacao" editMode="row"
					value="#{edicaoAplicacaoVacinaBean.listaVacinacoes}"
					editable="true" rowIndexVar="rowIdx">

					<p:ajax event="rowEditInit" process="@this"
						listener="#{edicaoAplicacaoVacinaBean.onRowEditInit}"
						update="@form:dtVacinacoes:#{rowIdx}:selVacinadores :messages"/>
					<p:ajax event="rowEdit"
						listener="#{edicaoAplicacaoVacinaBean.onRowEditSave}"
						update="@this :messages" />
					<p:ajax event="rowEditCancel"
						update="@this :messages" />

					<!--  Other columns -->

					<p:column headerText="#{msgVAC['Vacinacao.dsVacinador']}"
						width="10%">
						<div>
							<p:cellEditor>
								<f:facet name="output">
									<h:outputText value="#{vacinacao.vacinador.dsVacinador}" />
								</f:facet>
								<f:facet name="input">
									<h:selectOneMenu value="#{vacinacao.vacinador}" id="selVacinador"
										style="width:100%" converter="entityConverter">
										<f:selectItems 
											value="#{edicaoAplicacaoVacinaBean.listaVacinadores}"
											var="vacinador" itemLabel="#{vacinador.dsVacinador}"
											itemValue="#{vacinador}" />
									</h:selectOneMenu>
								</f:facet>
							</p:cellEditor>
						</div>
					</p:column>

					<!--  Other columns -->
					
					<p:column style="width:6rem">
						<p:rowEditor editTitle="#{msg['gen.editar']}"
							cancelTitle="#{msg['gen.cancelar']}"
							saveTitle="#{msg['gen.salvar']}" />
					</p:column>
				</p:dataTable>
			</div>
		</div>
	</p:outputPanel>
</h:form>

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	public void onRowEditInit(RowEditEvent event) {
		// code
	}

When we have that code, almost everything works fine: the method is called, the parameter is getted and the list was refreshed..
BUT
My AJAX update does not reload the

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<h:selectOneMenu id="selVacinador" />

whit the fresh list to populate

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<f:selectItems value="#{edicaoAplicacaoVacinaBean.listaVacinadores}" />

On debug mode, we could see the

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public List<VacinadorModel> getListaVacinadores() { return listaVacinadores; }

was not called.

After some analysis, we realise a conclusion:
- On the moment when method is called and the update was invoked, the 'rowIdx' was not loaded yet. He are null.

If whe change

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update="@form:dtVacinacoes:#{rowIdx}:selVacinadores :messages"/>

to

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update="@form:dtVacinacoes:@row(#{rowIdx}) :messages"/>

we got a Exception:

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Expression does not match following pattern @row(n). Expression: "@row()"

javax.faces.FacesException: Expression does not match following pattern @row(n). Expression: "@row()"
at org.primefaces.expression.impl.RowExpressionResolver.validate(RowExpressionResolver.java:98)
at org.primefaces.expression.impl.RowExpressionResolver.resolveClientIds(RowExpressionResolver.java:31)
at org.primefaces.expression.SearchExpressionFacade.resolveClientIdsByExpressionChain(SearchExpressionFacade.java:642)
at org.primefaces.expression.SearchExpressionFacade.resolveClientIds(SearchExpressionFacade.java:192)
at org.primefaces.util.AjaxRequestBuilder.addExpressions(AjaxRequestBuilder.java:93)
at org.primefaces.util.AjaxRequestBuilder.update(AjaxRequestBuilder.java:86)
...
Caused by: javax.faces.FacesException: Expression does not match following pattern @row(n). Expression: "@row()"
at org.primefaces.expression.impl.RowExpressionResolver.validate(RowExpressionResolver.java:94)
... 69 more

That exception we got because de 'rowIdx' is null. As we can see on https://github.com/primefaces/primeface ... olver.java

But, when we build a test including a column on dataTable like this

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<p:column headerText="#{msgVAC['Vacinacao.nrDose']}">
	<h:outputText value="#{rowIdx}" />
</p:column>

The row was printed with the Index correctly.

So, my question is:
Why the attribute dataTable.rowIndexVar was not loaded yet when we execute the AJAX call?

Thanks for all who spent a time to get some help.

I`m using Primefaces 6.1 and JSF 2.2

[Melloware]

I don't think you can update="" a single row like that. I could be wrong but I don't think it works like that.

[DGorges]

I don't think you can update="" a single row like that. I could be wrong but I don't think it works like that.

I think we could, because if whe do this:

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update="@form:dtVacinacoes:0:selVacinadores

or this

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update="@form:dtVacinacoes:row(0)

or even this

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update="@this

the row, and just that row, was updated.

But, in this case, the rows update turn the 'edit' mode from PF off.