ActionListener for datatable....

"gbattine" <>
5 Sep 2006 07:19:17 -0700
Hi guys,
i'm crazying with these datatables and with my problems with them...
i've read BalusC article and all the posts about datatables...but i
haven't found a clear response to my problem.
I've a datatable

    binding="#{biosamplesTable.biosampleDataTable}" border="3"
bgcolor="pink" >
    <h:column >
        <f:facet name="header">
            <h:outputText value="Organism" />
       <h:selectOneMenu value="#{biosampleItem.organism}">
        <f:selectItems value="#{biosample.selectOrganism}"/>


        <f:facet name="header">
            <h:outputText value="Treatment Protocol" />
        <h:inputText value="#{biosampleItem.treatmentProtocol}" />

    <h:column >
        <f:facet name="header">
            <h:outputText value="Extraction Method" />
        <h:inputText value="#{biosampleItem.extractionMethod}" />

        <f:facet name="header">
            <h:outputText value="Actions" />

        value="Invia dati biosample"
actionListener="#{biosamplesTable.editBiosample}" id="editBiosample">


    <h:messages globalOnly="true"/>

and it works fine,allowing user to send each row of data with

Now i want to add an actionlistener to datatable that when it's clicked
it add a new column to mydatatable of empty values(i'm using this
datatable for input operations).
I thinks it's an easy question,i ask you to help me with some code..
this is my code...

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIColumn;
import javax.faces.component.UIInput;
import javax.faces.component.UIOutput;
import javax.faces.component.html.HtmlDataTable;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.event.ActionEvent;
import javax.sql.DataSource;

public class BiosamplesTable {
    private List biosamples= new ArrayList();

    private HtmlDataTable biosampleDataTable;

    private Biosample biosampleItem;

    private int nrows;

    private int load=0;
    public HtmlDataTable getBiosampleDataTable() {

        return biosampleDataTable;

    public void setBiosampleDataTable(HtmlDataTable biosampleDataTable) {
        this.biosampleDataTable = biosampleDataTable;

    public Biosample getBiosampleItem() {
        return biosampleItem;

    public void setBiosampleItem(Biosample biosampleItem) {
        this.biosampleItem = biosampleItem;

    public List getBiosamples() throws Exception {

        // Reload after every request.

        return biosamples;

    public void setBiosamples(List biosamples) {
        this.biosamples = biosamples;

    public void loadBiosamples() throws Exception {

        if (load==0){

        for (int i = 0; i < nrows; i++) {
            Biosample biosample = new Biosample();

    public int getNrows() {
        return nrows;

    public void setNrows(int nrows) {
        this.nrows = nrows;

please help me and excuse me for my many posts about this problem,i've
learned much,but i'm not able to solve my problem.......
please help me..

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