How do you reset inputText values in a dataTable?

Question

I'm having what must be a simple and common problem,
but nothing I've tried has solved it. I want to be
able to refresh (reset) the inputText field values in a dataTable.
I have a dataTable that holds required inputText components.
I want to have a "cancel" button which would abandon any edits
on these components and refresh (reset) them with their backing values,
as well as removing the last row from the table (used to enter a
new record). Because the inputText components are required,
I made the cancel button immediate. I don't know what code I can
put in the button's actionListener. Right now, the displayed values
survive the round trip to the server and back to the browser, but
I want them to be reset to their backing values.
Here is the page, and the backing bean of a test example:
<%@ include file="../include/taglibs.jsp" %>
<h:dataTable id="table" value="#{pc_Test.list}" var="x">
    <h:column>
        <h:panelGroup>
            <h:inputText id="label_value" required="true" value="#{x.value}" />
            <h:message for="label_value"/>
        </h:panelGroup>
    </h:column>
    <f:facet name="footer">
        <h:panelGroup>
            <h:commandButton id = "btnn" value="new row" actionListener="#{pc_Test.newRow}" /> 
            <f:verbatim>  </f:verbatim>
            <h:commandButton id = "btnu" value="update" actionListener="#{pc_Test.update}" />  
            <f:verbatim>  </f:verbatim>
            <h:commandButton id = "btnr" value="cancel" immediate="true" actionListener="#{pc_Test.cancel}"/>
        </h:panelGroup>
    </f:facet>
</h:dataTable>
<f:verbatim>Summary=</f:verbatim>
<h:outputText value="#{pc_Test.listString}" />
package pagecode;
import java.util.ArrayList;
import java.util.List;
import javax.faces.event.ActionEvent;
public class TestPage {
    public static class Example {
        public Example(String value){this.value = value;}
        public String getValue() {return value;}
        public void setValue(String value) {this.value = value;}
        public String toString(){return getValue();}
        private String value;
    public TestPage(){
        list.add(new Example("a"));
        list.add(new Example("b"));
        list.add(new Example("c"));
    public List getList() {return list;}
    public String getListString() {return list.toString();}
    public void update(ActionEvent event){}
    public void cancel(ActionEvent event){
        if (list.size()>3)
            list.remove(list.size()-1);
    public void newRow(ActionEvent event){
        list.add(new Example(""));
    private boolean readOnly;
    private List list = new ArrayList();
}If it makes a difference, my implementation of JSF is MyFaces. Thanks!

Answer 1

bump
I'm not happy with having javascript reseting fields in a table before submitting:
there's a noticable screen flash, and I'd like a server-side solution anyway.
Question: UIInput has methods getSubmittedValue and setSubmittedValue,
so I can use these to ignore or clear submitted values when I press an
immediate command button. This takes care of subclasses like HtmlInputText
but not for data tables. Is there a way to manipulate all the submitted values
of a data table?