Show HN: JavaScript snippet to highlight new posts - <AUTHOR>

Hi all. I wanted an easy way to highlight new posts, without basing it on the last time I visited a page. The snippet is as follows, if any of you folks would like to use it:

  /**
   * Usage: highlight('newpost', 3, 'hours');
   *
   * This will add the class 'newpost' to any post made within
   * the past 3 hours. This includes, for example:
   *
   * 3 hours ago
   * 45 minutes ago
   * 22 seconds ago
   */
  function highlight(className, number, type) {
    var types = ['second', 'seconds',
                 'minute', 'minutes',
                 'hour', 'hours',
                 'day', 'days'];

    // Types are inclusive, so if we filtered to 'minutes', then
    // we always want posts that were made 'seconds' ago.
    types = types.slice(0, types.indexOf(type) + 1);

    // Any link with 'item?id' is assumed to be a timestamp.
    var posts = document.querySelectorAll('a[href*="item?id"]');

    // Loop through the number of posts, since we need to access
    // each post using NodeList#item.
    for(var i = 0; i < posts.length; i++) {
      var post = posts.item(i);

      try {
        // The leftmost integer.
        var label_number = parseInt(post.innerHTML.match(/^\d+/));

        // The label (a value that maps up to the types array).
        var label_type = post.innerHTML.match(/^\d+ (.+?) ago$/)[1];
      }
      catch(e) {
        // If either of the matches fail, it's due to an
        // irrelevant link.
        continue;
      }

      // Continue if the label is out of bounds.
      // For instance, 'days' when filtering by 'minutes'.
      if(types.indexOf(label_type) === -1) continue;

      // Continue if the label type matches, but the number
      // is larger than what we're filtering for.
      if(type === label_type && label_number > number) continue;

      // td > div > span > a
      post.parentNode.parentNode.parentNode.className += ' ' + className;
    }
  }
 <comment><USER2> Thanks for sharing. Here's a bookmarklet that injects a custom style:

javascript:void%20function(){function%20e(e,t,a){var%20n=%22.%22+e+'{%20padding- left:%2030px;background- image:%20url(%22[http://www.fasttrackcalltaxi.co.in/ft_clickyourtaxi/App_Imag...](http://www.fasttrackcalltaxi.co.in/ft_clickyourtaxi/App_Images/new_icon.gif%22\);%20background- repeat:%20no- repeat;%20}',c=document.head||document.getElementsByTagName\(%22head%22\)\[0\],d=document.createElement\(%22style%22\);d.type=%22text/css%22,d.styleSheet%3Fd.styleSheet.cssText=n:d.appendChild\(document.createTextNode\(n\))),c.appendChild(d);var%20o=[%22second%22,%22seconds%22,%22minute%22,%22minutes%22,%22hour%22,%22hours%22,%22day%22,%22days%22];o=o.slice(0,o.indexOf(a)+1);for(var%20r=document.querySelectorAll('a[href*=%22item%3Fid%22]'),i=0;i%3Cr.length;i++){var%20s=r.item(i);try{var%20l=parseInt(s.innerHTML.match(/^\d+/)),u=s.innerHTML.match(/^\d+%20(.+%3F)%20ago$/)[1]}catch(m){continue}-1!==o.indexOf(u)%26%26(a===u%26%26l%3Et||(s.parentNode.className+=%22%20%22+e))}}e(%22newpost%22,3,%22hours%22)}();

Screenshot: [https://s3.amazonaws.com/tz-www- misc/hn.highlighter.2015-02-...](https://s3.amazonaws.com/tz-www- misc/hn.highlighter.2015-02-15+19_28_22.gif)</comment>