无刷新汽车品牌三级联动

                                                无刷新汽车品牌三级联动
         default.aspx:

< table  class ="wz"  cellSpacing ="0"  cellPadding ="0"  width ="100%"  border ="0" >
                                 < tr >
                                     < td  colSpan ="4" >< asp:textbox  id ="txtbrandcountry"  Runat ="server"  Text ="国内"  Width ="0" > asp:textbox >< asp:textbox  id ="txtpp"  Runat ="server"  Text ="0"  Width ="0" > asp:textbox >< asp:textbox  id ="txtcx"  Runat ="server"  Text ="0"  Width ="0" > asp:textbox >< input  onclick ="XmlPost1(0)"  type ="radio"  CHECKED name ="brandCountry" >< b > 国产 b >  
                                         < input  onclick ="XmlPost1(1)"  type ="radio"  name ="brandCountry" >< b > 进口 b > td >
                                 tr >
                                 < tr >
                                     < td  align ="right"  width ="50" > 品 牌： td >
                                     < td  align ="left" >< asp:dropdownlist  id ="DropDownList1"  runat ="server" > asp:dropdownlist >< asp:textbox  id ="txtppname"  Runat ="server"  Width ="0px"  CssClass ="ff" > asp:textbox > td >
                                     < td  align ="right"  width ="50" > 车 型： td >
                                     < td  align ="left" >< asp:dropdownlist  id ="DropDownList2"  runat ="server" > asp:dropdownlist >< asp:textbox  id ="txtcxname"  Runat ="server"  Width ="0px"  CssClass ="ff" > asp:textbox > td >
                                 tr >                                  < tr >
                                     < td  align ="left"  colSpan ="4" >< font  color ="red" >   当前车型为：
                                             < div  id ="pjname" > div >
                                         font >
                                     td >
                                 tr >
table >

< SCRIPT  language ="JavaScript" >
            
             SCRIPT >

default.cs:

private   void  Page_Load( object  sender, System.EventArgs e)
        {
             if ( ! this .IsPostBack)
　　        {
　　　　         this .down1_bind( " 0 " ); // 帮定国产车型
                 this .DropDownList1.Attributes.Add( " onchange " , " XmlPost2(this); " );
                 this .DropDownList2.Attributes.Add( " onchange " , " setchexing(); " );
                
　　        }
　　         if (carid  !=   "" )
　　        {
               // 如果品牌不为空时，帮定车型
　　　　         this .down2_bind(carid);
　　        }
             if (brandCountry  !=   "" &&  brandCountry != " on " )
　　        {
                 // 帮定国内或进口车型
　　　　         this .down3_bind(brandCountry);
                
　　        }

            
        }
         #region  down2_bind
             private   void  down2_bind( string  id)
            {
　　         string  mystr  =   "" ;
             string  sql = " select csmallid,classname from Base_ProdClass where cbigid=' " + id + " ' and NamePY is null order by classname " ;
　　        DataSet ds  =  SqlHelper.ExecuteDataset(SqlHelper.CONN_STRING,CommandType.Text,sql);

　　         if (ds.Tables[ 0 ].Rows.Count  !=   0 )
　　        {
　　　　         for ( int  i = 0 ;i < ds.Tables[ 0 ].Rows.Count;i ++ )
　　　　        {
　　　　　　        mystr  +=   " , "   +  ds.Tables[ 0 ].Rows[i][ 0 ].ToString()  +   " | "   +  ds.Tables[ 0 ].Rows[i][ 1 ].ToString();
                    
　　　　        }
　　　　        mystr  =  mystr.Substring( 1 );
　　        }
　　         this .Response.Write(mystr);
　　         this .Response.End();
            }
         private   void  down22_bind( string  id)
        {
　　         string  mystr  =   "" ;
             string  sql = " select csmallid,classname from Base_ProdClass where cbigid=' " + id + " ' and NamePY is null order by classname " ;
　　        DataSet ds  =  SqlHelper.ExecuteDataset(SqlHelper.CONN_STRING,CommandType.Text,sql);
             this .DropDownList2.DataValueField  =   " csmallid " ;
　　         this .DropDownList2.DataTextField  =   " classname " ;
　　         this .DropDownList2.DataBind();　
            DropDownList2.Items.Insert( 0 , new  ListItem( " 选择系列.. " ,String.Empty));　  
            DropDownList2.SelectedIndex  =  DropDownList2.Items.IndexOf(DropDownList2.Items.FindByValue( this .txtcx.Text));

　　       
        }
        
         #endregion

         #region  carid
             private   string  carid
            {
                 get
                {
                     if (ViewState[ " carid " ] != null   &&  ViewState[ " carid " ].ToString() != "" )
                    {
                         return  ViewState[ " carid " ].ToString();
                    }
                     else
                    {
                         if (Request[ " carid " ] != null   &&  Request[ " carid " ].ToString() != "" )
                        {
                             return  Request[ " carid " ];
                        }
                         else
                        {
                             return   "" ;
                        }
                    }
                }
                 set
                {
                    ViewState[ " carid " ] = value;
                }
            }

        
         #endregion
        
         #region  brandCountry
         private   string  brandCountry
        {
             get
            {
                 if (ViewState[ " brandCountry " ] != null   &&  ViewState[ " brandCountry " ].ToString() != "" )
                {
                     return  ViewState[ " brandCountry " ].ToString();
                }
                 else
                {
                     if (Request[ " brandCountry " ] != null   &&  Request[ " brandCountry " ].ToString() != "" )
                    {
                         return  Request[ " brandCountry " ];
                    }
                     else
                    {
                         return   "" ;
                    }
                }
            }
             set
            {
                ViewState[ " brandCountry " ] = value;
            }
        }

        
         #endregion


         #region  down1_bind
             private   void  down1_bind( string  country)
            {
　　       
            
　　        DataSet ds  = SqlHelper.ExecuteDataset(SqlHelper.CONN_STRING,CommandType.Text, " select cbigid,classname from Base_ProdClass where NamePY=' " + country + " ' order by classname " );
　　         this .DropDownList1.DataSource  =  ds;
　　         this .DropDownList1.DataValueField  =   " cbigid " ;
　　         this .DropDownList1.DataTextField  =   " classname " ;
　　         this .DropDownList1.DataBind();　
            DropDownList1.Items.Insert( 0 , new  ListItem( " 选择品牌.. " ,String.Empty));
            DropDownList2.Items.Insert( 0 , new  ListItem( " 选择系列.. " ,String.Empty));　        
            }
         private   void  down3_bind( string  id)
        {
　　      
             string  mystr  =   "" ;
             string  sql = " select cbigid,classname from Base_ProdClass where NamePY=' " + id + " ' order by classname " ;
　　        DataSet ds  =  SqlHelper.ExecuteDataset(SqlHelper.CONN_STRING,CommandType.Text,sql);

　　         if (ds.Tables[ 0 ].Rows.Count  !=   0 )
　　        {
　　　　         for ( int  i = 0 ;i < ds.Tables[ 0 ].Rows.Count;i ++ )
　　　　        {
　　　　　　        mystr  +=   " , "   +  ds.Tables[ 0 ].Rows[i][ 0 ].ToString()  +   " | "   +  ds.Tables[ 0 ].Rows[i][ 1 ].ToString();
　　　　        }
　　　　        mystr  =  mystr.Substring( 1 );
　　        }
　　         this .Response.Write(mystr);
　　         this .Response.End();　        
        }
         #endregion

sql:

 

CREATE   TABLE   [ dbo ] . [ Base_ProdClass ]  (
     [ CBigID ]   [ varchar ]  ( 4 ) COLLATE Chinese_PRC_CI_AS  NOT   NULL  ,
     [ CSmallID ]   [ varchar ]  ( 2 ) COLLATE Chinese_PRC_CI_AS  NULL  ,
     [ ClassName ]   [ varchar ]  ( 50 ) COLLATE Chinese_PRC_CI_AS  NOT   NULL  ,
     [ NamePY ]   [ varchar ]  ( 50 ) COLLATE Chinese_PRC_CI_AS  NULL  
)  ON   [ PRIMARY ]
GO

数据库下载，此车型库为11月29日更新

转载于:https://www.cnblogs.com/jasonduan/archive/2006/11/30/577780.html