TreeSevice
[code="java"]
package name.sencha;
public class TreeService {
public String getLevel1Nodes(){
return "[{text:\"北京\", id:\"1\"},{text:\"吉林\", id:\"2\"}]";
}
public String getLevel2Nodes(){
return "[{text:\"丰台\", id:\"1-1\"},{text:\"海淀\", id:\"1-2\", leaf:true},{text:\"东城\", id:\"1-3\", leaf:true},{text:\"西城\", id:\"1-4\", leaf:true}]";
}
public String getLevel3Nodes(){
return "[{text:\"长春\", id:\"2-1\", leaf:true},{text:\"吉林\", id:\"2-2\", leaf:true},{text:\"白山\", id:\"2-3\", leaf:true},{text:\"白城\", id:\"2-4\", leaf:true}]";
}
public String getLevel4Nodes(){
return "[{text:\"丰台1区\", id:\"1-1-1\", leaf:true},{text:\"丰台2区\", id:\"1-1-2\", leaf:true},{text:\"丰台3区\", id:\"1-1-3\", leaf:true},{text:\"丰台小学\", id:\"1-1-4\", leaf:true}]";
}
public String getTreeNodeS(String id){
if(id==null||id.length()==0){
return "[]";
}else if(id.equals("0")){
return getLevel1Nodes();
}else if(id.equals("1")){
return getLevel2Nodes();
}else if(id.equals("2")){
return getLevel3Nodes();
}else{
return getLevel4Nodes();
}
}
}
[/code]
TreeServlet :
[code="java"]
package name.sencha;
import java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TreeServlet extends HttpServlet{
@Override
public void doPost(HttpServletRequest request, HttpServletResponse response){
String id = request.getParameter("id");
if(id!=null&&id.length()>0){
TreeService service = new TreeService();
try {
response.setCharacterEncoding("UTF-8");
response.getWriter().write(service.getTreeNodeS(id));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response){
doPost(request, response);
}
}
[/code]
web.xml:
[code="java"]
treeservlet
name.sencha.TreeServlet
treeservlet
/tree
[/code]
html :
[code="html"]
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
Ext.onReady(function(){ Ext.BLANK_IMAGE_URL = "../../ext-3.0.0/resources/images/default/s.gif"; var rootNode = new Ext.tree.AsyncTreeNode({ text : "根", id : "0", expanded : true }); var tree = new Ext.tree.TreePanel({ root : rootNode, loader : new Ext.tree.TreeLoader({ dataUrl : "../../tree" }), width : 200, height : 400 }); tree.on("beforeload" , function(node){ tree.loader.baseParams.id = node.id; }); tree.on("click", function(node){ Ext.Ajax.request({ url : "../../tree", params : {id:1}, success : function(res){ var txt = res.responseText; var obj = Ext.decode(txt); alert(obj.length); } }); }); tree.render(Ext.get("tree_div")); }); Insert title here
[/code]
