AJAX readyState is always 1

[dante671]

Hi

I have been attempting to check that a username exists in a text file using JavaScript. I call the CheckUserExists () method (below) passing in the username. However the readyState is always 1 so the file does not get read.

The webpage I am calling it from is something like this: www.mysite.co.u k/html/home.html

and the text file is located at: www.mysite.co.u k/html/resources/somefile.txt

I know really I should use server-side scripts but this is not possible so I need to use JavaScript.

Anyone got any ideas where I am going wrong? This has been doing my head in all day so hopefully someone knows what I have done wrong.

var name;
var file;
	
function CheckUserExists(username)
{
	name=username;
	
	if(window.XMLHttpRequest)
	{
		file = new XMLHttpRequest();
	}
	else if(window.ActiveXObject)
	{
		file = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else
	{
		alert("Error XMLHTTP Not Supported");
	}
		
	file.open("GET", "resources/somefile.txt", true);
	file.onreadystagechange = ReadFile(); 
	file.send(null);
}

function ReadFile()
{
	if(file.readyState == 4 || file.readyState == "complete") //Check file is ready to parse
	{
		if(file.status == 200) //Check file was found
		{
			//Read file etc...
		}	
	}
	else
	{
		alert(file.readyState);
	}
}

[acoder]

Change line 22 to:

file.onreadystagechange = ReadFile;

[dante671]

Thanks for the reply, I have made that change that you suggested and it now works.

Very strange though as I tried it earlier and it didn't work but after going for dinner and coming back then making the change again it works.

[acoder]

Perhaps you were viewing a cached version of the page?

Anyway, glad to hear that it's now working.

[dante671]

It won't have been a cached version of the page as I tried clearing the cache a few times and then refreshing the page.

Very pleased it's working it had been getting on my nerves. Thanks again for your help.