Hai..
I am new to GWT .When developing GWT tree fill application ..unable
to set data to TreeNodes dynamically (Data Coming from database)
Here my code:
---------------------------------------------------------
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;
/**
*
* @author veerraju
*/
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());
ArrarList 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.");
}
}
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Any body can help me ...
thanks in advance....
Raju
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