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.uk/html/home.html

and the text file is located at: www.mysite.co.uk/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.