Hai..
I am very new to GWT .When I developing Tree filling application ,I
unable to set data to TreeNodes(I used RPC )
Here My Code:
----------------------------Client
Side---------------------------------------------------------------------------
package org.karishma.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.ui.FocusListener;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;
import com.google.gwt.user.client.ui.TreeListener;
import com.google.gwt.user.client.ui.Widget;
import com.gwtext.client.widgets.Panel;
import java.util.ArrayList;
public class TreeMainEntryPoint implements
EntryPoint,TreeListener,FocusListener {
public Tree tree ;
class PendingItem extends TreeItem {
public PendingItem() {
super("Please wait...");
}
}
class TreeNode {
public TreeNode[] children;
public TreeItem item;
public String text;
public String value;
public String pgCode;
public String level;
public TreeNode(String text,String value,String pgCode,String
level) {
this.text = text;
this.value=value;
this.pgCode=pgCode;
this.level=level;
}
public TreeNode(String text,String value,String pgCode,String
level, TreeNode[] children) {
this(text,value,pgCode,level);
this.children = children;
}
}
TreeNode[] fTreeNode = new TreeNode[]{
new TreeNode("group1","10","","0", new TreeNode[]{
new TreeNode("A","20","10","1", new TreeNode[]{
new TreeNode("1","30","20","2"),
new TreeNode("2","40","20","2"),
new TreeNode("3","50","20","2"),
new TreeNode("4","60","20","2"),
new TreeNode("5","70","20","2"),}),
new TreeNode("B","80","10","1", new TreeNode[]{
new TreeNode("B1","90","80","2"),
new TreeNode("B2","100","80","2"),
new TreeNode("B3","110","80","2"),}),
new TreeNode("C","120","10","1", new TreeNode[]{
new TreeNode("C1","130","120","2"),
new TreeNode("C2","140","120","2"),}),
new TreeNode("D","150","10","1", new TreeNode[]{
new TreeNode("1","160","150","2"),
new TreeNode("2","170","150","2"),
new TreeNode("3","180","150","2"),}),}),
new TreeNode("group2","190","","0", new TreeNode[]{
new TreeNode("A","200","190","1", new TreeNode[]{
new TreeNode("A1","210","200","2"),
new TreeNode("A2","220","200","2"),
new TreeNode("A3","230","200","2"),
new TreeNode("A4","250","200","2"),}),
new TreeNode("B","260","190","1",new TreeNode[]{
new TreeNode("1","240","260","2"),
new TreeNode("2","270","260","2"),
new TreeNode("3","280","260","2")
}),
}),
};
/**
The entry point method, called automatically by loading a
module
that declares an implementing class as an entry-point
*/
public void onModuleLoad() {
tree = new Tree();
for (int i = 0; i < fTreeNode.length; ++i) {
createItem(fTreeNode[i]);
tree.addItem(fTreeNode[i].item);
}
tree.addTreeListener(this);
tree.addFocusListener(this);
tree.setWidth("10px");
Panel p1=new Panel();
p1.add(tree);
p1.setTitle("Tree Structure");
p1.setBorder(true);
p1.setPaddings(5);
p1.setSize(250,500);
p1.setAutoScroll(true);
RootPanel.get().add(p1);
// Create an asynchronous callback to handle the result.
final AsyncCallback callback = new AsyncCallback() {
public void onSuccess(Object result) {
Window.alert(result.toString());
ArrayList al1=(ArrayList )result;
}
public void onFailure(Throwable caught) {
Window.alert("Communication failed....");
}
};
getService().getTree(callback);
}
private void createItem(TreeNode TreeNode) {
TreeNode.item = new TreeItem(TreeNode.text);
TreeNode.item.setUserObject(TreeNode);
TreeNode.item.setSelected(true);
if (TreeNode.children != null) {
TreeNode.item.addItem(new PendingItem());
}
}
public void onTreeItemSelected(TreeItem item) {
Window.alert("code:"+((TreeNode) item.getUserObject()).value
+";desc:"+((TreeNode) item.getUserObject()).text+";pgcode:"+
((TreeNode) item.getUserObject()).pgCode+";level:"+((TreeNode)
item.getUserObject()).level);
}
public void onTreeItemStateChanged(TreeItem item) {
TreeItem child = item.getChild(0);
if (child instanceof PendingItem) {
item.removeItem(child);
TreeNode tn = (TreeNode) item.getUserObject();
for (int i = 0; i < tn.children.length; ++i) {
createItem(tn.children[i]);
item.addItem(tn.children[i].item);
}
}
}
public static TreeServiceAsync getService(){
// Create the client proxy. Note that although you are
creating the
// service interface proper, you cast the result to the
asynchronous
// version of
// the interface. The cast is always safe because the
generated proxy
// implements the asynchronous interface automatically.
TreeServiceAsync service = (TreeServiceAsync) GWT.create
(TreeService.class);
// Specify the URL at which our service implementation is
running.
// Note that the target URL must reside on the same domain and
port from
// which the host page was served.
//
ServiceDefTarget endpoint = (ServiceDefTarget) service;
String moduleRelativeURL = GWT.getModuleBaseURL() +
"treeservice";
endpoint.setServiceEntryPoint(moduleRelativeURL);
return service;
}
public void onLostFocus(Widget tree1) {
this.tree=(Tree)tree1;
}
public void onFocus(Widget tree1) {
throw new UnsupportedOperationException("Not supported yet.");
}
----------------------------------------------------------------------------------------------------
package org.karishma.client;
import com.google.gwt.user.client.rpc.RemoteService;
import java.util.ArrayList;
public interface TreeService extends RemoteService{
public ArrayList getTree();
}
}
-----------------------------------------------------------------------------------------------------------
package org.karishma.client;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface TreeServiceAsync {
public void getTree(AsyncCallback callback);
}
--------------------------------------------------Server
Side------------------------------------------
package org.karishma.server;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import java.sql.*;
import java.util.ArrayList;
import org.karishma.client.TreeService;
public class TreeServiceImpl extends RemoteServiceServlet implements
TreeService {
private Connection con;
public ArrayList getTree() {
// Do something interesting with 's' here on the server.
ArrayList treeDada = new ArrayList();
try {
Class.forName("com.ibm.db2.jcc.DB2Driver");
con=DriverManager.getConnection
("jdbc:db2://192.9.200.124:50000/LIMS","db2admin","db2admin"); //
ACCOUNTTABLE1,GROUPTABLE1
System.out.println("---connected---");
//getting data from GROUPTABLE1
String vsql="select * from GROUPTABLE1";
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(vsql);
while(rs.next()){
ArrayList data = new ArrayList();
data.add(rs.getString(1));
data.add(rs.getString(2));
data.add(rs.getString(3));
data.add(rs.getString(4));
System.out.println(rs.getString(1)+"\t"+rs.getString
(2)+"\t"+"\t"+rs.getString(3)+"\t"+rs.getString(4));
treeDada.add(data);
}
System.out.print("-----------------------");
//getting data from ACCOUNTTABLE1
String vsql1="select * from ACCOUNTTABLE1";
rs=stmt.executeQuery(vsql1);
while(rs.next()){
ArrayList accData = new ArrayList();
accData.add(rs.getString(1));
accData.add(rs.getString(2));
accData.add(rs.getString(3));
accData.add(rs.getString(4));
System.out.println(rs.getString(1)+"\t"+rs.getString
(2)+"\t"+"\t"+rs.getString(3)+"\t"+rs.getString(4));
treeDada.add(accData);
}
}catch(Exception e){
e.printStackTrace();
}
return treeDada;
}
}
-----------------------------------------------------
ACCOUNTTABLE1:
---------------------------------------
---------------------------------
ACODE ANAME PGCODE LEVEL
----------------------------------------------------------------------------
30 1 20 2
100 B2 80 2 (Like that
same as hardcoded in EntryPoint Class )
-----------------------------------------------------------------------------
Note Account table Records nothing but the final leafs which have no
childs
GroupTable1:
------------------------------------------------------------------------
GCOCE GNAME PGCODE LEVEL(same as hard coded in EP
class)
-----------------------------------------------------------------------
Group1 10 0
20 A 10 1
80 B 10 1
--------------------------------------------------------------------
Any body can help me .....I need building tree logic too..
Thanks in advance.....
Raju.........
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