inter/docs/_includes/autoreload-in-debug.html

{% if site.safe == false %}
<!-- During authoring, this automatically reloads the post as its changing -->
<script type="text/javascript">
(function() {
var qs = document.location.search;
var current_etag = qs.match(/etag=("?[a-zA-Z0-9_-]+)/);
if (current_etag !== null) { current_etag = current_etag[1]; }
var scrolly = qs.match(/scrolly=([0-9]+)/);
if (scrolly) {
  scrolly = parseInt(scrolly[1]);
  if (scrolly > 0) {
    window.scrollTo(window.scrollX, scrolly);
    setTimeout(function () {
      window.scrollTo(window.scrollX, scrolly);
    }, 10);
  }
}

function check() {
  var r = new XMLHttpRequest();
  var url = document.location.href + ((qs && qs !== '') ? '&' : '?') + 'r=' + Math.random();
  r.open('GET', url, true);
  r.onreadystatechange = function() {
    if (r.readyState == 4){
      var found_etag = r.getResponseHeader('Etag');
      if (found_etag) {
        found_etag = found_etag.replace(/^"|"$/g);
      }
      //console.log('current_etag:', current_etag, 'found_etag:', found_etag);
      if (current_etag === null) {
        current_etag = found_etag;
      } else if (found_etag !== current_etag) {
        document.location.search =
          '?etag=' + encodeURIComponent(found_etag) +
          '&scrolly=' + window.scrollY;
        return;
      }
      setTimeout(check, 500);
    }
  };
  r.send(null);
}
check();
})();
</script>
{% endif %}