ajax实现无刷屏级联下拉框

 

 1       
 2            http_request=null;
 3            function doAJAX()
 4            {
 5            if (window.XMLHttpRequest)
 6            {
 7                http_request=new XMLHttpRequest();
 8            }
 9            else (window.ActiveXObject)
10            {
11                http_request=new ActiveXObject("Microsoft.XMLHTTP");
12            }
13            http_request.onreadystatechange = GetDate;
14              var S = document.Form1.select1.value;
15              alert(S); 
16              var url='WebForm2.aspx?sABC='+escape(S);
17              
18           http_request.open('POST',url,true);
19           var dataSet='sABC='+escape(S);
20           http_request.send(null);
21           }
22            function GetDate()
23            {
24              if (http_request.readyState==4)
25            {
26                if(http_request.status==200)
27                {    
28                    
29                   var a= http_request.responseText.split(",");
30                //清空原来的OPTIONS
31                 var nL = document.Form1.select2.options.length;
32                   while(nL>1)
33                   {
34                        alert(document.Form1.select2.options.length);
35                        document.Form1.select2.remove(document.Form1.select2.options.length-1);
36                        nL = document.Form1.select2.options.length;
37                   }
38                   for(i=0;i<a.length;i++)
39                   {
40                   var opt=new Option();  
41                   opt.value=a[i]    ;
42                   opt.text=a[i];
43                   var sel1Object = document.Form1.select2;
44                   sel1Object.add(opt);
45                   }
46                  
47               }
48               }
49            }
50            
51       
52

 

 1        private void Page_Load(object sender, System.EventArgs e)
 2        {
 3            string str;
 4            // 在此处放置用户代码以初始化页面
 5           string li= this.Request.Headers.ToString();
 6            this.Request.Headers.GetValues(0);
 7            if(Request.QueryString["sABC"]!=null)
 8            {
 9                string aaa="";
10                str = Request.QueryString["sABC"].ToString();
11            
12                ajaxDAL.Class1 test = new Class1();
13                ArrayList al = test.Test(str);
14                for(int i =0;i<al.Count;i++)
15                {
16                    aaa+= al[i].ToString()+",";
17                }
18                aaa = aaa.Remove(aaa.Length-1,1);
19                Response.Write(aaa);
20                Response.End();
21            }
22        }
23
24
25        public ArrayList Test(string s)
26        {
27            ArrayList al = new ArrayList();
28            if(s=="美亚在线")
29            {
30                al.Add("市场部");
31                al.Add("开发部");
32            }
33            if(s=="美亚商旅")
34            {
35                al.Add("商旅中心");
36                al.Add("物流部");
37            }
38            return al;
39        }
40