Hi Group,
This is Krishna. I need to implement the concept of
HistoryListener in my project. For that I tried to implement small
example.
I have taken 3 pages each containing Hyperlink say
HyperLink1,HyperLink2,HyperLink3. On click on each hyperlink It has to
redirect to other page. by using History Concept.
Problem :History is not maintaining properly if I click on Back or
Forward Button.
Actual Outcome:
It has to redirect to the proper page by maintaining History
Concept.
For that I tried with the following Snippet.
Page1 Snippet :
------------------------
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.HistoryListener;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Hyperlink;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
public class Sample implements EntryPoint, HistoryListener
{
VerticalPanel panel = new VerticalPanel();
String oldToken = null;
public void onModuleLoad() {
// TODO Auto-generated method stub
Hyperlink h = new Hyperlink();
h.setText("HyperLink1");
h.setTargetHistoryToken("HyperLink1");
h.addClickListener(new ClickListener(){
public void onClick(Widget sender) {
// TODO Auto-generated method stub
panel.clear();
HyperLink1 p = new HyperLink1();
p.onModuleLoad();
}});
panel.add(h);
RootPanel.get().add(panel);
History.addHistoryListener(this);
}
public void onHistoryChanged(String historyToken) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
// If they are the same, no need to do anything
if (oldToken != null && historyToken.equals(oldToken))
return;
// Save the token for the next time round
oldToken = historyToken;
// Get the tab index
if(historyToken.equals("HyperLink2")){
panel.clear();
HyperLink2 p = new HyperLink2();
p.onModuleLoad();
}
else
if(historyToken.equals("HyperLink3")){
panel.clear();
Sample p = new Sample();
p.onModuleLoad();
}
}
}
Page2 Snippet :
----------------------
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.HistoryListener;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Hyperlink;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
import com.gwtext.client.widgets.Panel;
public class HyperLink1 extends Panel implements HistoryListener
{
VerticalPanel panel = new VerticalPanel();
String oldToken = null;
public void onModuleLoad() {
// TODO Auto-generated method stub
Hyperlink h = new Hyperlink();
h.setText("HyperLink2");
h.setTargetHistoryToken("HyperLink2");
h.addClickListener(new ClickListener(){
public void onClick(Widget sender) {
// TODO Auto-generated method stub
panel.clear();
HyperLink2 p = new HyperLink2();
p.onModuleLoad();
}});
panel.add(h);
RootPanel.get().add(panel);
History.addHistoryListener(this);
}
public void onHistoryChanged(String historyToken) {
// TODO Auto-generated method stub
if (oldToken != null && historyToken.equals(oldToken))
return;
// Save the token for the next time round
oldToken = historyToken;
// Get the tab index
if(historyToken.equals("HyperLink2")){
panel.clear();
HyperLink2 p = new HyperLink2();
p.onModuleLoad();
}
else
if(historyToken.equals("HyperLink3")){
panel.clear();
Sample p = new Sample();
p.onModuleLoad();
}
}
}
Page 3 Snippet :
------------------------
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.HistoryListener;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Hyperlink;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
public class HyperLink2 implements EntryPoint, HistoryListener{
VerticalPanel panel = new VerticalPanel();
String oldToken = null;
public void onModuleLoad() {
// TODO Auto-generated method stub
Hyperlink h = new Hyperlink();
h.setText("HyperLink3");
h.setTargetHistoryToken("HyperLink3");
h.addClickListener(new ClickListener(){
public void onClick(Widget sender) {
// TODO Auto-generated method stub
panel.clear();
Sample m = new Sample();
m.onModuleLoad();
}});
panel.add(h);
RootPanel.get().add(panel);
History.addHistoryListener(this);
}
public void onHistoryChanged(String historyToken) {
// TODO Auto-generated method stub
if (oldToken != null && historyToken.equals(oldToken))
return;
// Save the token for the next time round
oldToken = historyToken;
// Get the tab index
if(historyToken.equals("HyperLink1")){
panel.clear();
HyperLink1 p = new HyperLink1();
p.onModuleLoad();
}
else
if(historyToken.equals("HyperLink3")){
panel.clear();
Sample p = new Sample();
p.onModuleLoad();
}
}
}
If you need further information Please let me know in advance.
Thanks in advance for your earliest reply.....
--~--~---------~--~----~------------~-------~--~----~
http://groups.google.com/group/Google-Web-Toolkit-Contributors
-~----------~----~----~----~------~----~------~--~---
