【Vegas原创】Ajax实现无刷新三联动

1.html代码：
<SCRIPT language="javascript">               
//部别------------------------------
function excclassResult() 
            { 
var excclass=document.getElementById("exc_dept");
AjaxMethod.GetexcclassList(excclass.value,get_excclass_Result_CallBack);
            }

function get_excclass_Result_CallBack(response)
            {
if (response.value != null)
                {                    

//debugger;
document.all("exc_class").length=0;　　　　            
　　　　            var ds = response.value;
　　　　            //alert (ds.Tables[0].Rows[0].escclass);
if(ds != null && typeof(ds) == "object" && ds.Tables != null)
                    {                    
for(var i=0; i<ds.Tables[0].Rows.length; i++)
　　　　                {
　　　　                    var name=ds.Tables[0].Rows[i].escclass;
　　　　　　                var id=ds.Tables[0].Rows[i].escclassid;
　　　　　　                document.all("exc_class").options.add(new Option(name,id));
　　　　                }
                    }
                } 

return 
            }
//站别----------------------------------------
function exczbResult() 
            { 

//var a=document.all("exc_class").options[document.all("exc_class").SelectedIndex].Value;
//alert (a);
var exczb=document.getElementById("exc_class");
//alert(exczb.value);
//var exczb=document.all("exc_dept");


//alert (exczb.value);
AjaxMethod.GetexczbList(exczb.value,get_exczb_Result_CallBack);
            }
function get_exczb_Result_CallBack(response)
            {
//alert (response.value)
if (response.value != null)
                {                    

document.all("exc_zb").length=0;　　　　            
　　　　            var ds = response.value;
if(ds != null && typeof(ds) == "object" && ds.Tables != null)
                    {                    
for(var i=0; i<ds.Tables[0].Rows.length; i++)
　　　　                {
　　　　　　                var name=ds.Tables[0].Rows[i].exczb;
　　　　　　                var id=ds.Tables[0].Rows[i].exczbID;
　　　　　　                document.all("exc_zb").options.add(new Option(name,id));
　　　　                }                
                    }
                }
return
            }
function getData()
            {
var excdept=document.getElementById("exc_dept");
var pindex = excdept.selectedIndex;
var pValue = excdept.options[pindex].value;
var pText  = excdept.options[pindex].text;

var excclass=document.getElementById("exc_class");
var cindex = excclass.selectedIndex;
var cValue = excclass.options[cindex].value;
var cText  = excclass.options[cindex].text;

var exczb=document.getElementById("exc_zb");
var aindex = exczb.selectedIndex;
var aValue = exczb.options[aindex].value;
var aText  = exczb.options[aindex].text;            
            }
</SCRIPT>
<tr>

<td>发现厂别</td>

<td>

<asp:dropdownlist id="Dropdownlist1" runat="server"></asp:dropdownlist>

</td>

<td>事业部别</td>

<td>

<asp:dropdownlist id="Dropdownlist2" runat="server"></asp:dropdownlist>

</td>

</tr>

<tr>

<td>站别名称</td>

<td  colSpan="3" >

<tr>

<td width="137" rowSpan="3">

<asp:listbox id="Listbox1" runat="server" Selectinotallow="Multiple"></asp:listbox>

</td>
2.cs代码
    Ajax.Utility.RegisterTypeForAjax(typeof(AjaxMethod));
            if(!Page.IsPostBack)
            {
                this.exc_dept.DataSource=AjaxMethod.GetexcdeptList();
                this.exc_dept.DataTextField="excdept";
                this.exc_dept.DataValueField="excdeptid";
                this.exc_dept.DataBind();
                this.exc_dept.Attributes.Add("onclick","excclassResult();");
                this.exc_class.Attributes.Add("onclick","exczbResult();");
            }         3.Ajax代码

    public class AjaxMethod
    {
    //    private Connection conFlowER;
        public AjaxMethod()
        {
            //
            // TODO: 在此处添加构造函数逻辑

        //    conFlowER = new Connection(DatabaseType.Kernal);

            //        // string sql="select item_name,item_value from fm_code_list where form_kind='BQS.FORM.T601'    and field_name='F01'";
        }

        #region GetexcdeptList

        public static DataSet GetexcdeptList()
        {
            string sql="select * from excdept";
            return GetDataSet(sql);
        }
        #endregion

        #region GetexcclassList
        [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
        public  DataSet GetexcclassList(int excdeptid)
        {
            string sql="select * from excclass where father="+excdeptid;
        //    string sql="select item_name,item_value from fm_code_list where form_kind='BQS.FORM.T601'    and field_name='F02'";
            return GetDataSet(sql);            
        }
        #endregion

        #region GetexczbList
        [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
        public  DataSet GetexczbList(int excclassid)
        {
            string sql="select * from exczb where father="+excclassid;
        // string sql="select item_name,item_value from fm_code_list where form_kind='BQS.FORM.T601'    and field_name='F03'";
            return GetDataSet(sql);            
        }
        #endregion

        #region GetDataSet
        public static DataSet GetDataSet(string sql)
        {
            string Cnotallow=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
            SqlDataAdapter sda =new SqlDataAdapter(sql,ConnectionString);
            DataSet ds=new DataSet();
            sda.Fill(ds);
            return ds;
        }
        #endregion


    }
4.web.config
<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />
</httpHandlers>5.ajax.dll下载/Files/singlepine/Ajax.rar