Problem with Dynamic DataTable.

[Sudeep Agrawal]

I was trying to implement dynamic table. I was not able to bind the column values. For some reason the binding values were always comming in as null.
Here is the code

ListData.java : Data Class

 
package com.sudeep.ui.bean;
 
public class ListData 
{
private String myName = "";
private String myAge = "";

/* (non-Javadoc)
 * @see java.lang.Object#toString()
 */
@Override
public String toString()
{
StringBuffer info = new StringBuffer();
info.append("\n ******* List DATA *******");
info.append("\n NAME : " + this.getMyName());
info.append("\n AGE  : "  + this.getMyAge());
info.append("\n==========================");
return info.toString();
}
 
/**
 * @return Returns the myAge.
 */
public String getMyAge() {
return myAge;
}
 
/**
 * @param myAge The myAge to set.
 */
public void setMyAge(String myAge) {
this.myAge = myAge;
}
 
/**
 * @return Returns the myName.
 */
public String getMyName() {
return myName;
}
 
/**
 * @param myName The myName to set.
 */
public void setMyName(String myName) {
this.myName = myName;
}
}//ListData

DataProvider.java

  
package com.sudeep.ui.bean;
 
import java.util.ArrayList;
 
public class DataProvider 
{
private String heading = "Test";
private ArrayList <ListData> dataList = new ArrayList<ListData>();
 
public DataProvider()
{
System.out.println(">>> DataProvider() ::: Constructor");
for (int i = 0 ; i < 5 ; i ++)
{
ListData data = new ListData();
data.setMyName("Name_"+(i+1));
data.setMyAge("Age_"+(i+1)*5);
dataList.add(data);
}//for
System.out.println("<<< DataProvider() ::: List size : " + dataList.size());
}//DataProvider
/**
 * @return Returns the dataList.
 */
public ArrayList<ListData> getDataList() 
{
System.out.println("\n\n\n\n get DataList with Size = " + dataList.size());
return dataList;
}
/**
 * @param dataList The dataList to set.
 */
public void setDataList(ArrayList<ListData> dataList) {
this.dataList = dataList;
}
/**
 * @return Returns the heading.
 */
public String getHeading() {
return heading;
}
/**
 * @param heading The heading to set.
 */
public void setHeading(String heading) {
this.heading = heading;
}
}//DataProvider
 

DynamicDataTable Bean.

    
package com.sudeep.ui.bean;
 
import javax.faces.component.UIColumn;
import javax.faces.component.html.HtmlDataTable;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import javax.faces.model.DataModel;
 
public class DynamicTable 
{
private HtmlDataTable htmlTable ;
//private DataModel columnData;
    private int numOfCols = 2;
/**
 * @return Returns the htmlTable.
 */
@SuppressWarnings("unchecked")
public HtmlDataTable getHtmlTable() 
{
System.out.println(">>> getHtmlTable()");
htmlTable = new HtmlDataTable();
ValueBinding htmlBind = FacesContext.getCurrentInstance().getApplication().createValueBinding("#{dataProvider.dataList}");
System.out.println("ValueBinding Expression : " + htmlBind.getExpressionString());
System.out.println("ValueBinding Value : " + htmlBind.getValue(FacesContext.getCurrentInstance()));
htmlTable.setValueBinding("value",htmlBind);
htmlTable.setVar("myVar");
htmlTable.setId("TestDataTableId");
System.out.println("List Size : " + htmlTable.getRowCount());
htmlTable.setRendered(true);
htmlTable.setBorder(2);
System.out.println("Table basic attributes are set.");

UIColumn col1 = new UIColumn();
col1.setId("colId_1");
HtmlOutputText someText1 = new HtmlOutputText();
someText1.setId("outTextId_1");
ValueBinding someValueBinding = FacesContext.getCurrentInstance().getApplication().createValueBinding("#{myVar.myName}");
System.out.println("ValueBinding Expression : " + someValueBinding.getExpressionString());
System.out.println("ValueBinding Value : " + someValueBinding.getValue(FacesContext.getCurrentInstance()));
//someText.setValue("TESTING_DATA_"+(i+1));
someText1.setValueBinding("value" ,someValueBinding);
col1.getChildren().add(someText1);
htmlTable.getChildren().add(col1);

UIColumn col = new UIColumn();
col.setId("colId_2");
HtmlOutputText someText = new HtmlOutputText();
someText.setId("outTextId_2");
    someValueBinding = FacesContext.getCurrentInstance().getApplication().createValueBinding("#{myVar.myAge}");
System.out.println("ValueBinding Expression : " + someValueBinding.getExpressionString());
System.out.println("ValueBinding Value : " + someValueBinding.getValue(FacesContext.getCurrentInstance()));
//someText.setValue("TESTING_DATA_"+(i+1));
someText.setValueBinding("value" ,someValueBinding);
col.getChildren().add(someText);
htmlTable.getChildren().add(col);




System.out.println("<<< getHtmlTable()");
return htmlTable;
}//getHtmlTable
 
/**
 * @param htmlTable The htmlTable to set.
 */
public void setHtmlTable(HtmlDataTable htmlTable) {
this.htmlTable = htmlTable;
}


}//DynamicTable
 

 <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Dynamic DataTable</title>
</head>
<body>
<f:view>
<h:outputText value="#{dataProvider.heading}"/>
[B]<h:dataTable binding="#{dynamicTable.htmlTable}" />[/B]
</f:view>
</body>
</html>

[Sudeep Agrawal]

I am really looking for how do I bind values of each Object in the Collection, marked as a value of the Data Table to a component in a column, and then add the column to the dataTable.

Anyone please advice.

Thanks.