Code
1 <HTML xmlns = "http://www.w3.org/1999/xhtml">
2 3 <title> </title>
4 <script language = "JavaScript" type = "text/JavaScript">
5 function ajaxcall (){
6 var XMLHTTP;
7 try {// Firefox, opera 8.0 +, Safari
8 XMLHTTP = new XMLHttpRequest (); // instantiate the XMLHTTPRequest object
9}
10 catch (e ){
11
12 // Internet Explorer 5 +
13 try {
14 XMLHTTP = new activexobject ("msxml2.xmlhttp ");
15}
16 catch (e ){
17
18 try {
19 XMLHTTP = new activexobject ("Microsoft. XMLHTTP ");
20}
21 catch (e ){
22 alert ("the browser does not support Ajax! ");
23 return false;
24}
25}
26}
27 // bind the data processing function.
28 XMLHTTP. onreadystatechange = function (){
29 If (XMLHTTP. readystate = 4 ){
30 if (XMLHTTP. Status = 200 ){
31 document. getelementbyid ('lbtext'). innerhtml = XMLHTTP. responsetext;
32}
33 else {
34 alert ('request error .');
35}
36
37
38}
39}
40 XMLHTTP. Open ("Post", "http: // localhost: 1576/webservice1.asmx/helloworld", true); // asynchronous request data
41 XMLHTTP. setRequestHeader ("Content-Type", "application/X-WWW-form-urlencoded;"); // for post requests, set the request requestheader. Otherwise, XMLHTTP. Status is 50042.
43 XMLHTTP. Send ("strname = GG"); // The strname is the number of parameters in the helloworld WebService method.
44
45}
46
47 </SCRIPT>
48
49
50 51 <body>
52 <Form ID = "form1" runat = "server">
53 <div>
54 <asp: Label id = "lbtext" runat = "server"> </ASP: Label>
55 <a href = "javascript: void (0)" onclick = 'ajaxcall () '> click here </a>
56 </div>
57 </form>
58 </body>
59 60
61
62
63 ======= WebService ==========
64
65 [WebService (namespace = "http://tempuri.org/")]
66 [webservicebinding (conformsto = wsiprofiles. basicprofile1_1)]
67 [system. componentmodel. toolboxitem (false)]
68 // to allow ASP. Net ajax to call this web service from a script, cancel the comments to the downstream.
69 // [system. Web. Script. Services. scriptservice]
70 public class webservice1: system. Web. Services. WebService
71 {
72
73 [webmethod, scriptmethod] // set scriptmethod to the WebService method called by the client
74
75 Public String helloworld (string strname)
76 {
77 return strname + "Hello World ";
78}
79}
80
81
