Verify links to files, to know if accessible or not

verify-hard-links

<!-- This simple piece of code will look for specific links, verify them using HEAD request to know if it exists/is accessible or not -->
<!-- Every failed files will be displayed into the failed-list <span> -->
<!-- NOTE : This script might "freeze" your browser for a while, don't worry, let it finish -->
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<button id="launch-link-test">Test all links</button>

<li><a target="_blank" data-count="0" href="link-to-file.pdf">Link 0</a><span id="url-valid-0"></span></li>
<li><a target="_blank" data-count="1" href="link-to-file1.pdf">Link 1</a><span id="url-valid-1"></span></li>
<li><a target="_blank" data-count="2" href="link-to-file2.pdf">Link 2</a><span id="url-valid-2"></span></li>
<li><a target="_blank" data-count="3" href="link-to-file3.pdf">Link 3</a><span id="url-valid-3"></span></li>

<span id="failed-list">
</span>

<script type="text/javascript">
$(function() {
	$('#launch-link-test').click(function(){
		var $links = $('a[data-count]');
		for (i = 0; i < $links.length; i++)
		{
			if (UrlExists($links[i].href))
			{
				$('#url-valid-'+$($links[i]).data('count'))[0].innerHTML = "OK";
			}
			else
			{
				$('#url-valid-'+$($links[i]).data('count')).css('color', 'red').css('font-weight', 'bold');
				$('#url-valid-'+$($links[i]).data('count'))[0].innerHTML = "NOK";
				$('#failed-list').append('<p>'+$links[i].href+'</p>');
			}
		}
	});
	
});
function UrlExists(my_url) {
  var http = new XMLHttpRequest();
  http.open('HEAD', my_url, false);
  try
  {
    http.send();
  }
  catch(err)
  {
	  return false;
  }
  return http.status != 404;
}
</script>