Filtering table rows w/ jquery, and updating the "selected" style on the filter labels

table-row-filter.js

// Filter Row Script
// ........................................
$('.sidebar a').on('click', function(e){
  e.preventDefault();
  var condition = $(this).data('filter');

  //get all trs from tbody
  var trs = $(".main-messaging-content").find("tbody tr");
  trs.hide();

  //Filter all trs from tbody
  trs.filter(function (i, v) {
    if ($(this).data("status") == condition) {
      return true;
    }
    if ($(this).data("urgent")) {
      return true;
    }
    return condition == "all";
  })
  //just show the row if it fits the criteria
  .show();

  var prev = $('a.selected');
  $(this).addClass('selected');
  prev.removeClass('selected');
});

Borrowed from a SO answer