Dynamic add column to datatable

Question

Hi ,
How can I add columns to datatable dynamically ? I don't know how many columns will be selected.
Actually I don't know how to do it in the jsp file. There is columns tag in it. Is there any tag like 'for' ?
Thanks in advance.
Wilson

Answer 1

thanks for that but still cannot figure out what is wrong with my code (I'm really getting crazy !). I can see the titles of the columns but I cannot see any data. Any ideas ?
               <h:dataTable styleClass="dataTable" id="tablecsv"
                    binding="#{mainPage.dataTable}" rendered="#{mainPage.completed}"
                    value="#{mainPage.resultsModel}" var="varresultsModel" />
    public UIData getDataTable()
        FacesContext context = FacesContext.getCurrentInstance();
        String[] cols = getTheTable();
        List children = dataTable.getChildren();
        children.clear();
        dataTable.setVar("vartableRow");
        for (int i = 0; i < cols.length; i++)
            UIColumn col = new UIColumn();
            col.setId("column" + i); //?
            UIOutput out  = new UIOutput(); //?
            out.setId(cols[i] + i); //?
/*           children.add(col);
            HtmlOutputText header = new HtmlOutputText();
            String label = "" + cols;
header.setValue(label);
col.setHeader(header);
HtmlOutputText data = new HtmlOutputText();
col.getChildren().add(data);
data.setValueBinding("value", context.getApplication().createValueBinding("#{" + (i +1) + "}"));
HtmlOutputText header = new HtmlOutputText();
String label = "" + cols[i];
header.setValue(label);
col.setHeader(header);
ValueBinding vb = FacesContext.getCurrentInstance().getApplication().createValueBinding("#{result." + cols[i] + "}");
out.setValueBinding("value", vb);
col.getChildren().add(out);
dataTable.getChildren().add(col);
this.completed = true;
return this.dataTable;
public ArrayList getResultsModel()
               this.resultsModel = new ArrayList();
               for (int n = 0; n < getTheTable().size() - 1; n++)
               this.resultsModel.add(new Integer(n));
return this.resultsModel;