CodeProject: Calling Web Services From Html Pages using Javascript. Free source code and programming help

Download source files - 104 Kb

Sample Image - CallWebServiceFromHtml.jpg

Introduction

Hello everyone. In this article i wanted to show you, 'how to call a web service and pass parameters to its methods through html pages'. I hope it will be useful.

For this article we need to create a web service and a web site. Assume that our web service includes these methods...
[WebMethod] public string HelloWorld() { return "Hello World"; } //This method takes your birth year, month and day, //calculates your age and return the year. [WebMethod] public string GetAge(int year, int month, int day) { DateTime birthDate = new DateTime(year, month, day); long age = new DateTime(DateTime.Now.Ticks - birthDate.Ticks).Year - 1; return "You are " + age.ToString() + " years old."; } //This method caches the datetime for 4 seconds. //also a simple cache implementation. private const int CacheTime = 4; // seconds [WebMethod(CacheDuration = CacheTime, Description = "As simple as it gets - the ubiquitous Get Date Time.")] public string GetDateTime() { return DateTime.Now.ToString(); }

Html pages that call this web service

Your web page directory should include the 'webservice.htc' file. This file adds a behavior to html files for calling web services. You can find this file in the *.zip file you will download. I create 3 web pages for this solution;
Note : please don't forget to change port number for web service access in your html pages
1. HelloWorld.htm (calls Hello World Method)


 <html>
  <head>
   <title>Hello World</title>
    <script language="JavaScript">
     var iCallID;
     function InitializeService(){
      service.useService("http://localhost:1394/MyWebService.asmx?wsdl",  "HelloWorldService");
      service.HelloWorldService.callService("HelloWorld");
     }
     function ShowResult(){
      alert(event.result.value);
     }
    </script>
   </head>
  <body  onload="InitializeService()"  id="service" style="behavior:url(webservice.htc)"  onresult="ShowResult()">
    </body>
 </html>

2. GetAge.htm (calls GetAge method, takes 3 parameters)


 <html>
  <head>
   <title>UseSwap</title>
    <script language="JavaScript">
     function InitializeService(){
      service.useService("http://localhost:1394/MyWebService.asmx?wsdl",  "GetAgeService");
     }
     var StrYear, StrMonth, StrDay;
     function GetAge(){
      StrYear = document.DemoForm.StringYear.value;
      StrMonth = document.DemoForm.StringMonth.value;
      StrDay = document.DemoForm.StringDay.value;
      service.GetAgeService.callService("GetAge", StrYear, StrMonth, StrDay);
     }
     function ShowResult(){
    alert(event.result.value);
      }
     </script>
    </head>
     <body onload="InitializeService()"  id="service" style="behavior:url(webservice.htc)"  onresult="ShowResult()">
      <form name="DemoForm">
       Year : <input type="text" name="StringYear"/>

       Month : <input type="text" name="StringMonth"/>

       Day : <input type="text" name="StringDay"/>
 
       <button onclick="GetAge()">Get Age</button>

      </form>
     </body>
 </html>

3. GetDateTime.htm (returns cached value)


 <html>
  <head>
   <meta http-equiv="refresh" content="2" />
   <title>Get Date Time</title>
   <script language="JavaScript">
    var iCallID;
    function InitializeService(){
     service.useService("http://localhost:1394/MyWebService.asmx?wsdl",  "GetDateTimeService");
     service.GetDateTimeService.callService("GetDateTime");
    }
    function ShowResult(){
     alert(event.result.value);
    }
   </script>
  </head>
  <body  onload="InitializeService()"  id="service" style="behavior:url(webservice.htc)"  onresult="ShowResult()">
  </body>
 </html>

As listed above there are some javascript code written. But so easy to understand. First we add html page a behavior to access web service, then we make initialization and call the web service metod. Soon we get the result by event.result.value. That's all.
You can just copy and paste this code into your html pages and it works. Try the source code if you want. I hope it will be useful. Bye for now;)

You must Sign In to use this message board.


Per page

FirstPrevNext

Norm .net

22:53 27 Oct '09

PiyushHanda

22:17 30 Sep '09

rajuxxx

22:53 16 Apr '09

Hi everyone.I think my next article will solve your problems.

Gökmen BULUT

1:21 12 Feb '09

Re: Hi everyone.I think my next article will solve your problems.

Velmurugan Arjunan

21:36 6 Apr '09

How can i run this in Firefox?

justindhas

0:21 12 Oct '07

Re: How can i run this in Firefox?

sebas.naveen

2:20 15 Nov '07

Re: How can i run this in Firefox?

sandy_sam

20:59 28 Nov '07

Re: How can i run this in Firefox?

danYYac

22:52 28 Jan '09

Re: How can i run this in Firefox?

Talal Sultan

3:48 11 Feb '09

'event.result.value' is null ot not an object

pargath ranan

2:23 8 Feb '07

How to pass user name & password ??

nssidhu

6:46 6 Nov '06

codePimp

11:12 12 Sep '06

jayarao

5:57 28 Oct '06

tim.s.bell

10:44 14 Jun '07

Patrik Lindström

7:18 30 Jul '08

danYYac

22:53 28 Jan '09

Herre Kuijpers

5:32 6 Jul '06

Zip file is empty

Alan Lemming

4:20 29 Jun '06

Re: Zip file is empty

Gökmen BULUT

7:49 29 Jun '06

Last Visit: 3:14 22 Nov '09 Last Update: 3:14 22 Nov '09

1

Last Updated 29 Jun 2006 | Advertise | Privacy | Terms of Use | Copyright © CodeProject, 1999-2009