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XmlHTTPRequest status returns 0

Posted on 2009-06-29
2
2,966 Views
Last Modified: 2013-11-19
I am at a loss for why my code is not working. When I launch the attached html object I get the status code 0 instead of the expected 200. Does anyone know why I am getting this status? I have attached the xml and text files. Change Some.txt to Some.xml
<?xml version="1.0" encoding="UTF-8"?><html xmlns="http://www.w3.irg/1999/xhtml"><head id="header"><title id="title">This is a test</title><script type="text/javascript">window.onload = initAll;

var xhr = false;

var reqerr = "";
 

function initAll()

{

	document.getElementById("textRequest").onclick = getNewFile;

	document.getElementById("xmlRequest").onclick = getNewFile;

}
 

function getNewFile()

{

	makeRequest(this.href);

	return false; //do not display this url which is a file

}
 

function makeRequest(url)

{

	alert("url is " + url);

	if (window.XMLHttpRequest)

	{

		try

		{

			xhr = new XMLHttpRequest();

		}

		catch (e)

		{

			alert("no xml http request");

		}

	}

	else

	{

		if (window.ActiveXObject)

		{

			try

			{

				xhr = new ActiveXObject("Microsoft.XMLHTTP");

			}

			catch (e)

			{

				try

				{

					xhr = new ActiveXObject("Msxml2.XMLHTTP");

				}

				catch (e)

				{

					alert("No msxml2");

				}

			}

		}

	}
 

	if (xhr)

	{

		xhr.onreadystatechange = showContents;

		xhr.open("GET", url, true);

		xhr.send(null);

	}

	else

	{

		document.getElementById("updateArea").innerHTML = "Sorry, but I couldn't create an XMLHttpReqest";

	}

}
 

function showContents()

{

	if (xhr.readyState == 4)

	{

		if (xhr.status == 200)

		{

			if (xhr.responseXML && xhr.responseXML.contentType=="text/xml")

			{

				var outMsg = xhr.responseXML.getElementsByTagName("choices")[0].textContent;

			}

			else

			{

				var outMsg = xhr.responseText;

			}

		}

		else

		{

			var outMsg = "There was a problem with the request " + xhr.status + ": " + xhr.statusText;

		}

		document.getElementById("updateArea").innerHTML = outMsg;

	}

}

</script></head><body id="public"><h1 id="body.h1">This is the body</h1><p><a id="textRequest" href="sometext.txt">Reqeust a text file</a><br/><a id="xmlRequest" href="Some.xml">Request an xml file</a></p><div id="updateArea">&amp;nbsp;</div></body></html>

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Some.txt
sometext.txt
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Comment
Question by:atxtechie
2 Comments
 
LVL 41

Expert Comment

by:HonorGod
ID: 24740694
What is the value of readyState when status == 0?
0
 
LVL 5

Accepted Solution

by:
Opalelement earned 125 total points
ID: 24760906
The status will be 0 until a request is sent. After that the status code will be 200. Since it is the readystatechange event, it should be 200... However if it takes a second it may not get there.

What you can do is replace:

if (xhr.status == 200)

with:

if (xhr.status == 200 || xhr.status == 0)

Once it changes it shouldn't be possible for it to go back to 0, so it will still be okay for either one to be valid.
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