Geertjan's Blog

  • February 8, 2013

Display JavaHelp In Browser Instead Of JavaHelp Window

Geertjan Wielenga
Product Manager

Thanks to Henry Arousell and Jaroslav Havlin:

import java.net.URL;
import javax.swing.event.ChangeListener;
import org.netbeans.api.javahelp.Help;
import org.openide.awt.HtmlBrowser.URLDisplayer;
import org.openide.util.HelpCtx;
import org.openide.util.lookup.ServiceProvider;
import org.openide.util.lookup.ServiceProviders;
@ServiceProvider(service = HelpCtx.Displayer.class,
supersedes = {"org.netbeans.modules.javahelp.JavaHelp"}),
@ServiceProvider(service = Help.class,
supersedes = {"org.netbeans.modules.javahelp.JavaHelp"})
public class BrowserHelpDisplayer extends Help implements HelpCtx.Displayer {
public boolean display(HelpCtx hc) {
try {
new URL("http://www.google.com?q="
+ hc.getHelpID()));
} catch (Exception ex) {
return false;
return true;
public Boolean isValidID(String id, boolean force) {
return true;
public void showHelp(HelpCtx ctx, boolean showmaster) {
public void addChangeListener(ChangeListener l) {
public void removeChangeListener(ChangeListener l) {

The above puts the help ID into Google search. Not helpful in itself, but a starting point for publishing help topics on line, instead of in the JavaHelp window.

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