ExtJs2.0学习系列(14)--Ext.TreePanel之第三式(可增删改的树)

继续tree的learn! 今天就来个可增删改的树吧,操作数据库就使用比较方便的Linq,无非就是增删改!

LinqData.dbml:

html代码:

<!----> < body >
     < div  id ="container"  style ="float:left; margin-right:10px;" >
     </ div >
     < iframe  name ="mainFrame"  id ="mainFrame"  src ="http://www.baidu.com"  width ="200px"  height ="200px" ></ iframe >
</ body >

css代码:

<!----> <style type="text/css">
       .leaf
        {
             background-image : url(ExtJs/resources/images/default/tree/leaf.gif) !important ;
                } <!--节点右键菜单的叶子图片-->
       .folder
        {
               background-image : url(ExtJs/resources/images/default/tree/folder.gif) !important ;
                } <!--节点右键菜单的文件夹图片-->
    </style>

效果图:

图就不多贴出来,下面看核心代码:
核心代码:
js代码:

 

<!----> // /<reference path="Extjs_Intellisense.js" />
Ext.onReady( function (){
    var  mytree = new  Ext.tree.TreePanel({
       id: " mytree " ,
       el: " container " ,
       animate: true ,
       title: " 可增删改的树tree " ,
       collapsible: true ,
       frame: true ,
       enableDD: true ,
       enableDrag: true ,
       rootVisible: true ,
       autoScroll: true ,
       autoHeight: true ,
       width: 250 ,
       lines: true ,
       loader: new  Ext.tree.TreeLoader({
                url: " CURDTree.ashx " , // 服务器处理数据代码
                listeners:{
                     " loadexception " : function (loader,node,response){
                         // 加载服务器数据,直到成功
                        node.loaded  =   false ;
                        node.reload.defer( 10 ,node);
                     }
                }
       }),
       listeners:{
             " contextmenu " : function (node,e){
                               if (node.isLeaf())
                              {
                                   var  nodemenu = new  Ext.menu.Menu({
                                      items:[{
                                          text: " 添加小类别 " ,
                                          iconCls: ' leaf ' , // 右键名称前的小图片
                                          handler: function (){
                                            Ext.MessageBox.prompt( " 请输入新项名称 " , "" , function (e,text){
                                                 if (e == " ok " )
                                                {
                                                   Ext.Ajax.request({
                                                      url:  ' CURDTree.ashx?newitemParentid= ' + node.parentNode.id.substring( 2 ) + " &newitemValue= " + text,
                                                      success: function (request)
                                                      {
                                                          mytree.root.reload(); // 数的重新加载
                                                          mytree.root.expand( true , false );
                                                      },
                                                      failure: function (){
                                                          alert( " 添加失败 " );
                                                      }
                                                   });
                                                }
                                                 else
                                                {
                                                      alert( " 取消了 " );
                                                }
                                            })
                                          }
                                      },{
                                          text: " 编辑小类别 " ,
                                          iconCls: ' leaf ' ,
                                          handler: function (){
                                             Ext.MessageBox.prompt( " 请输入此项新名称 " , "" , function (e,text){
                                                 if (e == " ok " )
                                                {
                                                   Ext.Ajax.request({
                                                      url:  ' CURDTree.ashx?editItemid= ' + node.id + " &editItemvalue= " + text, // 传递需要的值，服务器会执行修改
                                                      success: function (request)
                                                      {
                                                          mytree.root.reload();
                                                          mytree.root.expand( true , false );
                                                      },
                                                      failure: function (){
                                                          alert( " 编辑失败 " );
                                                      }
                                                   });
                                                }
                                                 else
                                                {
                                                      alert( " 取消了 " );
                                                }
                                            })
                                          }
                                      },{
                                          text: " 删除小类别 " ,
                                          iconCls: ' leaf ' ,
                                          handler: function (){
                                             Ext.Ajax.request({
                                                      url:  ' CURDTree.ashx?delItemid= ' + node.id, // 根据id删除节点
                                                      success: function (request)
                                                      {
                                                          mytree.root.reload();
                                                          mytree.root.expand( true , false );
                                                      },
                                                      failure: function (){
                                                          alert( " 删除失败 " );
                                                      }
                                             });
                                          }
                                      }]
                                  });
                                  nodemenu.showAt(e.getPoint()); // menu的showAt，不要忘记
                              }
                               else   if ( ! node.isLeaf() && node.parentNode != null )
                              {
                                   var  nodemenu = new  Ext.menu.Menu({
                                      items:[{
                                          text: " 添加大类别 " ,
                                          iconCls: ' folder ' ,
                                          handler: function (){alert(node.id)} // 在此略去
                                      },{
                                         text: " 编辑大类别 " ,
                                         iconCls: ' folder ' ,
                                         handler: function (){alert( " 执行事件代码 " )}
                                      },{
                                         text: " 删除大类别 " ,
                                         iconCls: ' folder ' ,
                                         handler: function (){alert( " 执行事件代码 " )}
                                      }]
                                  });
                                  nodemenu.showAt(e.getPoint());
                              }
                          }  
       }
   });
   
    var  root = new  Ext.tree.AsyncTreeNode({
      id: " root " ,
      text: " 管理菜单 " ,
      expanded: true
   });
   
   mytree.setRootNode(root);
   mytree.render();
})

服务器端代码:

<!----> // CURDTree.ashx文件
// 引用Newtonsoft.Json.dll
<% @ WebHandler Language = " C# "  Class = " CURDTree "   %>

using  System;
using  System.Web;
using  System.IO;
using  System.Linq;
using  Newtonsoft.Json;

public   class  CURDTree : IHttpHandler {
    
     public   void  ProcessRequest (HttpContext context) {
        LinqDataDataContext lddc  =   new  LinqDataDataContext( @" Data Source=WIN-7JW7UWR0M27\MSSQL2005;Initial Catalog=LinqData;Persist Security Info=True;User ID=sa;Password=***** " );

         if  (context.Request.QueryString[ " newitemParentid " ]  !=   null   &&  context.Request.QueryString[ " newitemValue " ]  !=   null )
        {
             // 添加
            SmallClass sc  =   new  SmallClass();
            sc.BigClassId  =  Convert.ToInt32(context.Request.QueryString[ " newitemParentid " ]);
            sc.SmallClassName  =  Convert.ToString(context.Request.QueryString[ " newitemValue " ]);
            lddc.SmallClass.InsertOnSubmit(sc);
            lddc.SubmitChanges();
        }
         else   if  (context.Request.QueryString[ " editItemid " ]  !=   null && context.Request.QueryString[ " editItemvalue " ] != null )
        {
             // 编辑
            SmallClass sc  =  lddc.SmallClass.First(s  =>  s.id  ==  Int32.Parse(context.Request.QueryString[ " editItemid " ]));
            sc.SmallClassName  =  Convert.ToString(context.Request.QueryString[ " editItemvalue " ]);
            lddc.SubmitChanges();
        }
         else   if  (context.Request.QueryString[ " delItemid " ]  !=   null )
        {
             // 删除
            SmallClass sc  =  lddc.SmallClass.First(c  =>  c.id  ==  Int32.Parse(context.Request.QueryString[ " delitemid " ]));
            lddc.SmallClass.DeleteOnSubmit(sc);
            lddc.SubmitChanges();
        }
         else
        {
            StringWriter sw  =   new  StringWriter();
            JsonWriter writer  =   new  JsonWriter(sw);

            var results  =  from small  in  lddc.SmallClass
                          join big  in  lddc.BigClass on small.BigClassId equals big.id
                          group small by small.BigClassId;

             // 下面开始拼接json数据字符串
            writer.WriteStartArray(); // [，其他类似，请参见网上Newtonsoft.Json.dll的使用
             foreach  (var r  in  results)
            {
                writer.WriteStartObject();
                writer.WritePropertyName( " id " );
                writer.WriteValue( " b_ "   +  r.First().BigClass.id);
                writer.WritePropertyName( " text " );
                writer.WriteValue(r.First().BigClass.BigClassName);
                writer.WritePropertyName( " children " );
                writer.WriteStartArray();
                 foreach  (var s  in  r)
                {
                    writer.WriteStartObject();
                    writer.WritePropertyName( " id " );
                    writer.WriteValue(s.id);
                    writer.WritePropertyName( " href " );
                    writer.WriteValue( " FormSubmit.aspx?id= "   +  s.id);
                    writer.WritePropertyName( " hrefTarget " );
                    writer.WriteValue( " mainFrame " );
                    writer.WritePropertyName( " text " );
                    writer.WriteValue(s.SmallClassName);
                    writer.WritePropertyName( " leaf " );
                    writer.WriteValue( true );
                    writer.WriteEndObject();
                }
                writer.WriteEndArray();
                writer.WriteEndObject();
            }
            writer.WriteEndArray(); // ]

            writer.Flush();
             string  myjson  =  sw.ToString();
            context.Response.Write(myjson); // 输出json数据结果
        }
          
    }
 
     public   bool  IsReusable {
         get  {
             return   false ;
        }
    }

}

今天就做个例子,下回我们再继续讨论extjs的其他内容.