Javascript check file size

Question

Is it possible to keep checking with javascript if the filesize of a file on a webserver (e.g. http://www.mysite.com/myfile.js) is larger than 0 bytes and if so return a tru

Answer 1

The idea given by josh3736 is great. Only the code example he gave, refused to work in my browser (Chrome 20, Firefox 13, IE 8, Opera 12), for the reason, that I don't know.

Here is the one, that worked perfectly in my case:

jQuery.ajax
({
    cache: false,
    type: 'HEAD',
    url: 'myfile.js',
    success: function(d,r,xhr){alert('File size is ' + xhr.getResponseHeader('Content-Length') + ' bytes.')},
    error: function(xhr, desc, er){alert('ERROR: "' + xhr.responseText + '"')}
});

I want also to notice, that Apache on-board XAMPP server works just fine with HEAD request, but of course, when run on localhost, such request is blocked by a browser with error message: "Origin localhost is not allowed by Access-Control-Allow-Origin" (example from Chrome).