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How to call asp net web service from javascript using ajax
about 9 years ago
Hello all,
To call a web service from JavaScript using ASP.NET AJAX, there are certain steps that you have to follow which are listed bellow :
Decorate web service class with
[System.Web.Script.Services.ScriptService]
Include ScriptManager control on the WebForm from which you want to call your web service and specify the path of the web service
<asp:ScriptManager runat="server"> <Services> <asp:ServiceReference Path="~/GetData.asmx" /> </Services> </asp:ScriptManager>Now within the JavaScript, you can give fully qualified name of the Web Method that you want to invoke of Web Service.
WebServiceApp.GetDataService.Add(fisrtNumber, secondNumber, onSuccess, onError);
To understand this example we have following code packet :
In APSX page, we have
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebServiceApp.WebForm1" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script type="text/javascript" language="javescript"> function getServiceData() { var fisrtNumber = document.getElementById("txtfirstNumber").value; var secondNumber = document.getElementById("txtSecondNumber").value; WebServiceApp.GetDataService.Add(fisrtNumber, secondNumber, onSuccess, onError); } function onSuccess(callBackResult) { alert(callBackResult); } function onError(errors) { alert(errors.get_message()); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:ScriptManager runat="server"> <Services> <asp:ServiceReference Path="~/GetDataService.asmx" /> </Services> </asp:ScriptManager> <table> <tr> <td>Firts Number</td> <td> <asp:TextBox ID="txtfirstNumber" runat="server"></asp:TextBox></td> </tr> <tr> <td>Firts Number</td> <td> <asp:TextBox ID="txtSecondNumber" runat="server"></asp:TextBox></td> </tr> <tr> <td colspan="2" style="text-align: center;"> <input type="button" value="Get Sum" onclick="getServiceData()" /></td> </tr> <tr> <td colspan="2" style="text-align: center;"> <asp:Label ID="lblOutput" runat="server"></asp:Label></td> </tr> </table> </div> </form> </body> </html>In C# we have, Code for the Web Service :
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; namespace WebServiceApp { /// <summary> /// Summary description for GetDataService /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. [System.Web.Script.Services.ScriptService] public class GetDataService : System.Web.Services.WebService { [WebMethod] public int Add(int firstNumber, int secondNumber) { return firstNumber + secondNumber; } } }
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