how to call the gwt method from html <a href>

package com.sample.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.visualization.client.AbstractDataTable.ColumnType;
import com.google.gwt.visualization.client.DataTable;
import com.google.gwt.visualization.client.VisualizationUtils;
import com.google.gwt.visualization.client.visualizations.Table;
import com.google.gwt.visualization.client.visualizations.Table.Options;

public class Gwtgooglechartsexample implements EntryPoint
{
ScrollPanel scrollPanel=new ScrollPanel();
VerticalPanel vpanel=new VerticalPanel();
CenterPopupPanel popup=new CenterPopupPanel();
public void onModuleLoad()
{
RootPanel.get().add(vpanel);
vpanel.add(scrollPanel);
showTable();
//exportMyFunction(this);
}
private void showTable()
{
Runnable runnable=new Runnable()
{
@Override
public void run()
{
final Table table = new Table(createDataTable(), createTableOptions());
scrollPanel.clear();
scrollPanel.setWidget(table);
}
};
VisualizationUtils.loadVisualizationApi(runnable, Table.PACKAGE);
}

private DataTable createDataTable()
{
DataTable dataTable = DataTable.create();
dataTable.addColumn(ColumnType.STRING, "Items");
dataTable.addColumn(ColumnType.STRING, "Prices");
dataTable.addColumn(ColumnType.STRING, "Return Qty");
dataTable.addColumn(ColumnType.STRING, "Sold Qty");
dataTable.addColumn(ColumnType.STRING, "Required Qty");
dataTable.addRow();
dataTable.setValue(0, 0, "<a href='javascript:callPopup()'>item1</a>");
dataTable.setValue(0, 1, "<center>100</center>");
dataTable.setValue(0, 2, "<center>1</center>");
dataTable.setValue(0, 3, "<center>2</center>");
dataTable.setValue(0, 4, "<center>3</center>");
dataTable.addRow();
dataTable.setValue(1, 0, "<script type='text/javascript'>function myFunction(){alert('Welcome ')}</script><a href='javascript:myFunction()'>item2</a>");
dataTable.setValue(1, 1, "<center>200</center>");
dataTable.setValue(1, 2, "<center>2</center>");
dataTable.setValue(1, 3, "<center>3</center>");
dataTable.setValue(1, 4, "<center>2</center>");
return dataTable;
}
private Options createTableOptions()
{
Table.Options options = Table.Options.create();
options.setShowRowNumber(true);
options.setSortAscending(true);
options.setSortColumn(1);
options.setWidth("100%");
options.setHeight("100%");
options.setAllowHtml(true);
return options;
}

public static float getFormatted(float value) {
NumberFormat fmt = NumberFormat.getFormat(".00");
String val=fmt.format(value);
if(val.contains(","))
{
val=val.replace(",", "");
val.trim();
}
return Float.parseFloat(val);
}
public void callPopup()
{
Window.alert("test");
}
public static native void exportMyFunction(Gwtgooglechartsexample x) /*-{
$wnd.callPopup =$entry(x.@com.sample.client.Gwtgooglechartsexample::callPopup()());
}-*/;
}I have writen one program using gwt-visulization to gwt table. In that table it is allow html code.In that code to how to call the gwt method

see the following program:
package com.sample.client;

import com.google.gwt.core.client.

EntryPoint;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.visualization.client.AbstractDataTable.ColumnType;
import com.google.gwt.visualization.client.DataTable;
import com.google.gwt.visualization.client.VisualizationUtils;
import com.google.gwt.visualization.client.visualizations.Table;
import com.google.gwt.visualization.client.visualizations.Table.Options;

public class Gwtgooglechartsexample implements EntryPoint
{
    ScrollPanel scrollPanel=new ScrollPanel();
    VerticalPanel vpanel=new VerticalPanel();
    CenterPopupPanel popup=new CenterPopupPanel();
    public void onModuleLoad()
    {
        RootPanel.get().add(vpanel);
        vpanel.add(scrollPanel);
        showTable();
        //exportMyFunction(this);
    }
    private void showTable()
    {
        Runnable runnable=new Runnable()
        {
            @Override
            public void run()
            {
                final Table table = new Table(createDataTable(), createTableOptions());
                scrollPanel.clear();
                scrollPanel.setWidget(table);
            }
        };
        VisualizationUtils.loadVisualizationApi(runnable, Table.PACKAGE);
    }
   
    private DataTable createDataTable()
    {
        DataTable dataTable = DataTable.create();
        dataTable.addColumn(ColumnType.STRING, "Items");
        dataTable.addColumn(ColumnType.STRING, "Prices");
        dataTable.addColumn(ColumnType.STRING, "Return Qty");
        dataTable.addColumn(ColumnType.STRING, "Sold Qty");
        dataTable.addColumn(ColumnType.STRING, "Required Qty");
        dataTable.addRow();
        dataTable.setValue(0, 0, "<a href='javascript:callPopup()'>item1</a>");
        dataTable.setValue(0, 1, "<center>100</center>");
        dataTable.setValue(0, 2, "<center>1</center>");
        dataTable.setValue(0, 3, "<center>2</center>");
        dataTable.setValue(0, 4, "<center>3</center>");
        dataTable.addRow();
        dataTable.setValue(1, 0, "<script type='text/javascript'>function myFunction(){alert('Welcome ')}</script><a href='javascript:myFunction()'>item2</a>");
        dataTable.setValue(1, 1, "<center>200</center>");
        dataTable.setValue(1, 2, "<center>2</center>");
        dataTable.setValue(1, 3, "<center>3</center>");
        dataTable.setValue(1, 4, "<center>2</center>");
        return dataTable;
    }
    private Options createTableOptions()
    {
        Table.Options options = Table.Options.create();
        options.setShowRowNumber(true);
        options.setSortAscending(true);
        options.setSortColumn(1);
        options.setWidth("100%");
        options.setHeight("100%");
        options.setAllowHtml(true);
        return options;
    }
   
    public static float getFormatted(float value) {
        NumberFormat fmt = NumberFormat.getFormat(".00");
        String val=fmt.format(value);
        if(val.contains(","))
        {
            val=val.replace(",", "");
            val.trim();
        }
        return Float.parseFloat(val);
    }
    public void callPopup()
    {
        Window.alert("test");
        /*popup.setVisible(true);
        popup.show();
        popup.center();*/
    }
    public static native void exportMyFunction(Gwtgooglechartsexample x) /*-{
       $wnd.callPopup =$entry(x.@com.sample.client.Gwtgooglechartsexample::callPopup()());
    }-*/;
}

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