Primefaces dataTable with checkbox not work - checkbox

Question

I am using Primefaces 4.0 with jsf2.2.
When I use dataTable with checkbox, it won't send back any record whenever I select records.
It supposed to send back the record once I click the checkbox.
I remove extra stuff and make my code simple to test it:
There is a polling printing selected items every second, so that I can check is there something sent back.
And after doing this, I found there's nothing sent back.
Here's my code:
Page:
<h:head>
<title>System Monitor</title>
</h:head>
<h:body>
<h:form>
<p:poll interval="1" listener="#{indexBean.printSelect()}"/>
</h:form>
<h:form>
<p:dataTable id='data' var="proc" value="#{indexBean.procStatus}"
rowKey="#{proc.pid}" selection="#{indexBean.selectedProcs}">
<p:column>
<f:facet name='header'>
<h:outputText value='Process Name'/>
</f:facet>
<h:outputText styleClass="outputCell" id="pname" value='#{proc.name}'/>
</p:column>
<p:column selectionMode="multiple"/>
</p:dataTable>
</h:form>
</h:body>
Backing Bean:
#ManagedBean(name = "indexBean")
#ViewScoped
public class indexBean implements Serializable {
private ProcStatDataModel procStatus;
private SingleProcess[] selectedProcs;
#PostConstruct
public void loadProcStat() {
List<SingleProcess> temp = new ArrayList<>();
temp.add(new SingleProcess("test1"));
temp.add(new SingleProcess("test2"));
temp.add(new SingleProcess("test3"));
procStatus = new ProcStatDataModel(temp);
}
public void printSelect() {
if (selectedProcs != null) {
String str = "";
for (SingleProcess sp : selectedProcs) {
str += sp.getName() + "_";
}
System.out.print(str);
} else {
System.out.println("selectedProcs is null");
}
}
public ProcStatDataModel getProcStatus() {
return procStatus;
}
public SingleProcess[] getSelectedProcs() {
return selectedProcs;
}
public void setSelectedProcs(SingleProcess[] selectedProcs) {
this.selectedProcs = selectedProcs;
}
}
I've tried attaching rowCheckListener like this before but in vain.
Also, I tried adding f:view contentType="text/html" like this and it was not help.
It's weird because I do the same thing with the case of primefaces show case and it acts as I think. So I think this approach is OK, there should be something wrong in my code.
Any help is appreciated. Thanks in advance.

Answer 1

I made a few changes and it worked. Not sure, which one is the solution.
1) Changed all the ' to ".
2) Datatable's value="#{indexBean.procStatus}" is wrong i think. I changed it to the name of the ArrayList inside the class. So, it became value="#{indexBean.procStatus.mylist}"
3) Added an ajax listener, like the one you mentioned in the question. <p:ajax event="rowSelectCheckbox" listener="#{indexBean.check}" />.
4) Added pid to the constructor which will be our rowKey.
5) Now, the poll prints the array.
Resultin xhtml is as follows:
<h:head>
<title>System Monitor</title>
</h:head>
<h:body>
<h:form>
<p:poll interval="1" listener="#{indexBean.printSelect()}"/>
</h:form>
<h:form>
<p:dataTable id="data" var="proc" value="#{indexBean.procStatus.mylist}"
rowKey="#{proc.pid}" selection="#{indexBean.selectedProcs}">
<p:ajax event="rowSelectCheckbox" listener="#{indexBean.check}" />
<p:column>
<f:facet name="header">
<h:outputText value="Process Name"/>
</f:facet>
<h:outputText styleClass="outputCell" id="pname" value="#{proc.name}"/>
</p:column>
<p:column selectionMode="multiple"/>
</p:dataTable>
</h:form>
</h:body>
</ui:composition>
Bean:
#ManagedBean(name = "indexBean")
#ViewScoped
public class indexBean implements Serializable {
private ProcStatDataModel procStatus;
private SingleProcess[] selectedProcs;
#PostConstruct
public void loadProcStat() {
List<SingleProcess> temp = new ArrayList<SingleProcess>();
temp.add(new SingleProcess("test1",1));
temp.add(new SingleProcess("test2",2));
temp.add(new SingleProcess("test3",3));
procStatus = new ProcStatDataModel(temp);
}
public void printSelect() {
if (selectedProcs != null) {
String str = "";
for (SingleProcess sp : selectedProcs) {
str += sp.getName() + "_";
}
System.out.print(str);
} else {
System.out.println("selectedProcs is null");
}
}
public ProcStatDataModel getProcStatus() {
return procStatus;
}
public SingleProcess[] getSelectedProcs() {
return selectedProcs;
}
public void setSelectedProcs(SingleProcess[] selectedProcs) {
this.selectedProcs = selectedProcs;
}
public void check(SelectEvent event) {
System.out.println("in check");
}
}