小弟才接触.net对联动不是很熟悉,使用XML做数据源的联动。无法给dropdownlist赋值!
               我使用的是网上的DropDownList联动的例子(c#)   改写的。地区联动显示。 
 现在只有一个问题是,第二个DropDownList没有办法控制默认显示。     
 代码如下:前台 
 	       <script   language= "javascript ">       
       var   Wantcount;    
       var   Groupcount;      
       Groupcount=0;   
       Group   =   new   Array();    
        <asp:Literal   id= "Want "   runat= "server ">  </asp:Literal>       
       function   changelocation1(locationid)    
       {    
          document.submit.DirectionList1.length   =   0;    
          var   locationid=locationid;    
          var   i;    
          var   flag;    
          var   j;    
          for   (i=0;i <Groupcount;   i++)    
          {    
             if   (Group[i][0]   ==   locationid)    
             {    
                flag   =   true;    
                for   (j   =0;j <document.submit.DirectionList1.length;j++)    
                   if   (document.submit.DirectionList1[j].value   ==   Group[i][1])    
                      {    
                         flag   =   false;    
                         break;    
                      }    
                if   (flag)    
                   document.submit.DirectionList1.options[document.submit.DirectionList1.length]    
                   =   new   Option(Group[i][1],   Group[i][1]);    
             }    
          }    
       }        
       function   changelocation11(locationid,   direction)    
       {      
       }      
        </script>  
       	 <body   id= "body_acc "   ms_positioning= "GridLayout ">  
 		 <form   id= "submit "   method= "post "   runat= "server ">  
  <table   width= "950 "   border= "0 "   align= "center "   cellpadding= "0 "   cellspacing= "0 "   id= "my ">  
        <tr>  
              <td   align= "center "   bgcolor= "333333 ">  <!--#include   file= "bar.aspx "-->  </td>  
        </tr>  
  </table>  <tr>  <td   height=25      vAlign=bottom   bgcolor= "#FFFFFF "> 地区: </td>  
        <td   bgcolor= "#FFFFFF ">  <asp:dropdownlist   id= "SourceList1 "   runat= "server "   DataTextField= "v_source "   DataValueField= "v_source "   onchange= "changelocation1(document.submit.SourceList1.options[do