Add a new row to a p:datatable then submit content - jsf

Question

I'm trying to add a new row in a Primefaces datatable, then I would like to submit the content of this table and do some business logic. The datatable model is a collection that is maintained in a ViewScoped managed bean.
I'm using JSF 2.1 with Primefaces 3.3.
Short example:
<h:form id="my-form">
<p:dataTable value="#{testBean.list}" var="s" id="datatable">
<p:column>
<h:inputText value="#{s}"/>
</p:column>
<f:facet name="footer">
<p:commandButton value="Add row" action="#{testBean.addRow()}" process="#form" update="#form" immediate="true" />
<p:commandButton value="Do stuff" action="#{testBean.doSomeLogic()}" process="#form" update="#form"/>
</f:facet>
</p:dataTable>
</h:form>
Managed Bean:
#ManagedBean
#ViewScoped
public class TestBean implements Serializable {
private List<String> list;
public TestBean() {
}
#PostConstruct
public void init() {
list = new ArrayList<String>();
list.add("one");
list.add("two");
}
public void addRow(){
list.add(new String());
}
public void doSomeLogic(){
for (String string : list) {
System.out.println(string);
}
}
// getters and setters
}
What actually happens:
the user clicks on "add row" button, a new row is added (I need immediate to be true so no validation is done, those fields are part of a bigger form).
the user clicks on "do stuff", the collection has the right size (with new rows) but the user's input in not taken into account (neither modification to pre exiting rows, nor new values in freshly added rows).
What can I do to submit the new values too? I'm only beginning JSF and I'm not sure I'm already 100% getting it.
Thanks for your help.
Possible duplicates:
Add a row to h:dataTable via AJAX with request-scoped bean without losing the row data
How to Dynamically add a row in a table in JSF?
JSF datatable: adding and removing rows clear rows values
Edit: problem is solved thanks to Jitesh, a working example can be found here: JSF2, can I add JSF components dynamically?

Answer 1

The only problem is you are using immutable object in inputText. To understatnd this check out BaluC's Answer
According to it "As being an immutable object, the String doesn't have a setter method. The will never be able to set the entered value."
Try to remove immediate attribute from the commandButton you will find that on insertion of each row the data will be cleared.

Answer 2

If I understand correctly, there are some validations elsewhere in the form that are failing. When any of the submitted form values fail validation then none of the submitted values are applied to the managed bean unless immediate is used. This is why it seems that you are able to add a new row but not with the doStuff method. You did not add immediate to doStuff.
But stating that there are a few things you could do much more cleanly and efficiently.
First, the action attribute should really be used for navigation actions. JSF expects that methods bound to an action have a return value that represents the navigation result. For void methods it is better to use actionListener. For more information on the difference between action and actionListener read here: Differences between action and actionListener
Secondly, why not just set process and update to only the data table component and then you don't have to worry about other form validations? Here is an example:
<h:form id="my-form">
<p:dataTable value="#{testBean.list}" var="s" id="datatable">
<p:column>
<h:inputText value="#{s}"/>
</p:column>
<f:facet name="footer">
<p:commandButton value="Add row" actionListener="#{testBean.addRow}"
process=":my-form:datatable" update=":my-form:datatable" />
<p:commandButton value="Do stuff" actionListener="#{testBean.doSomeLogic}"
process=":my-form:datatable" update=":my-form:datatable" />
</f:facet>
</p:dataTable>
</h:form>