How to call asp.net webservice from jquery, javascript

This article shows, how you can call your webservice (.asmx) or inline aspx web method from jquery that will prevent to invoke whole life cycle of an aspx page and work faster than update panel .

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For that perticuler task we can make webservice inside that perticuler project and call them from the javascript (does’n invoke whole page life cycle only call that perticuler webservice method and not fire any other event of server)

Below is the JavaScript/jquery (jquery provide .ajax method) code for calling webservice named LocalWS(taking one parrameter named Msg) communicating through the json datatype.


Calling WebService From JQuery Code :

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js">
</script>

function CallLocalWS() {
 try {
 var dat = "{Msg:'hello'}";
 var options = {
    type: "POST",
    url: "/LocalWS",
    data: dat,
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(msg) {
        if (msg.d != "") {
            alert(msg.d);
        } 
        else {
              return false;
         }
    },
    error: function(xhr, ajaxOptions, thrownError) {
        alert(xhr.status +"  "+ thrownError +"  "+ ajaxOptions);
      }
 };

  $.ajax(options);
 }
 catch (ex) {
  alert("Error");
 }
}

Points :-
      If service method (webservice) is in aspx page then url should be as below :
          url: "/LocalWS"
          url: "http://www.mysite.com/webservicedemo.aspx/LocalWS"

   
      If service method is placed in separated asmx file then url should be as below :
          url: "http://www.mysite.com/webservice.asmx/LocalWS"

Below is the javascirpt callable webservice is can be placed in the same aspx page or in a different asmx file you can write your service any two of the files

For calling a method of the webservice through the javascript or jquery you have to add [System.Web.Script.Services.ScriptMethod] attribute on the the top of the method.


C# Inline in .Aspx web method code :

[System.Web.Services.WebMethod]
// this will allow Web Service to be called from script, using ASP.NET AJAX or direct from javascipt .
[System.Web.Script.Services.ScriptMethod]
public static string[] LocalWS(String Msg)
{
  string[] arr = new string[] { Msg+":Vivek", Msg+":Santosh"};
  return arr;
}





.Asmx file containing javascript callable web method :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// this will allow Web Service to be called from script, using ASP.NET AJAX or direct from javascipt .
[System.Web.Script.Services.ScriptService]
public class Javascriptcallable : System.Web.Services.WebService
{
    public Javascriptcallable() { }

    [WebMethod]
    public static string[] LocalWS(String Msg)
    {
        string[] arr = new string[] { Msg + ":Vivek", Msg + ":Santosh" };
        return arr;
    }

}



Below is the html code to invoking the webservice through the button, after clicking the button webservice called asynchronously (must add return false; for asynchronously call)..


Html Code :

<asp:Button runat="server" ID="btnCall" Text="Click to Call" OnClientClick="CallLocalWS(); return false;" />



the output of the code is given bellow :- 




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