Chapter 1 pg 14 Error on page at runtime

tomche · #1 (**permalink**) October 23rd, 2009, 07:21 AM

Hello all,

I have completed the example on page 14 and 15 and when trying to run once I press the button all I get is an error in internet explorer saying "error on page"

My asmx.cs file looks like this
it is located at aspajax3point5\App_Code\listing1-1.cs

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
/// <summary>
/// Summary description for listing1_1
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 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 listing1_1 : System.Web.Services.WebService {
public listing1_1 () {
//Uncomment the following line if using designed components 
//InitializeComponent(); 
}
[WebMethod]
public string HelloWorld() {
return "Hello ajax World";
}

}

the asmx file is located in a differenet path
aspajax3point4\listing1-1.asmx

My html file looks like this

Code:

<!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 runat="server">
<title>Basic AJAX Page</title>
<script type="text/javascript" language="javascript">
function InitiationFunction()
{
var xmlHttp;
try
{
xmlHttp = new XMLHttpRequest();
}
catch (e)
{
try
{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
alert("Your browser does not support AJAX!");
return false;
}
}
}
xmlHttp.onreadystatechange = function()
{
if(xmlHttp.readyState == 4 && xmlHttp.status == 200)
{
response = xmlHttp.responseXML;
document.forms[0].statement.value = 
response.getElementsByTagName("string") [0].firstChild.nodevalue;
}
}
xmlHttp.open("GET","~/listing1-1.asmx/HelloWorld?",true);
xmlHttp.send(null);
</script>
</head>
<body>
<form>
<div>
Statement from server:
<input type="text" name="statement" />
<br />
<br />
<input id="Button1" type="button" value="Button"
onclick="InitiationFunction()" />
</div>
</form>
</body>
</html>

Is the
xmlHttp.open("GET","~/listing1-1.asmx/HelloWorld?",true); the correct reference to the asmx file or should this reference the code?

Is the "~" the correct path?

The error in internet explorer says that the error occurs on Line 56 which in the html file
says the following

onclick="InitiationFunction()" />

Does this mean that it can't find InitiationFunction or that there is a problem in the InitiationFunction code?

Any help would be most appreciated.

Cheers

Tomche

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