Conditionally Add Bootstrap Table Responsive Class

While working on another post, I had some very large tables and I wanted to use Bootstrap Responsive Tables by adding the .table-responsive class but only in the situation where the table is too wide.

This is the code I used. I added it to the page using the Genesis Body Scripts meta box (because I’m using a Genesis theme).

<script>
(function() {
  var articles = document.getElementsByTagName('article'),
    i, allTables, tooWideTables;

  for (i=0; i<articles.length; i++) {
    var allTables = articles[i].getElementsByTagName('table'),
      tooWideTables = [].slice.call(allTables).filter(
        function(table) { return articles[i].clientWidth < table.clientWidth; }
    );

    tooWideTables.forEach(function(table) {
      table.className += ' table table-small table-responsive';
    });
  }
})();
</script>