Ajax With Javascript

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11 Oct 2013CPOL

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Create a simple page likeDefault.aspx<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

This articles was originally at wiki.asp.net but has now been given a new home on CodeProject. Editing rights for this article has been set at Bronze or above, so please go in and edit and update this article to keep it fresh and relevant.

Create a simple page like

Default.aspx

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>

    <script language="Javascript">
function xmlhttpPost(strURL) {
   // alert(strURL)
    var xmlHttpReq = false;
    var self = this;
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    self.xmlHttpReq.open('POST', strURL, true);
    self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {alert('hi');
            updatepage(self.xmlHttpReq.responseText);
        }
    }
    self.xmlHttpReq.send(getquerystring());
}

function getquerystring() {
    //var form     = document.forms['f1'];
//    var word = form.word.value;
//    qstr = 'w=' + escape(word); // NOTE: no '?' before querystring
//    return qstr;
}

function updatepage(str){
    alert(str)
    document.getElementById("result").innerHTML = str;
}
    </script>

</head>
<body>
   <form name="f1">
<p>word: <input name="word" type="text">
<input value="Go" type="button"
        onclick='JavaScript:xmlhttpPost("http://localhost:2835/website1/WebService.asmx/HelloWorld")'></p>
<div id="result"></div>
    </form>
</body>
</html>

Then Create a webservice

Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols

<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class WebService
     Inherits System.Web.Services.WebService

    <WebMethod()> _
    Public Function HelloWorld() As String
        Return "Hello World"
    End Function

End Class

http://dotnetclassic.com/post/AjaxWithJavascript.aspx

This article was originally posted at http://wiki.asp.net/page.aspx/377/ajax-with-javascript

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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ASP.NET Community

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The ASP.NET Wiki was started by Scott Hanselman in February of 2008. The idea is that folks spend a lot of time trolling the blogs, ~~googling~~live-searching for answers to common "How To" questions. There's piles of fantastic community-created and MSFT-created content out there, but if it's not found by a search engine and the right combination of keywords, it's often lost.

The ASP.NET Wiki articles moved to CodeProject in October 2013 and will live on, loved, protected and updated by the community.

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Ajax With Javascript

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