As we saw earlier in the chapter, row striping can be as simple as two lines of code to alternate the background color:

$(document).ready(function() {
  $('table.sortable tbody tr:odd').addClass('odd');
$('table.sortable tbody tr:even').addClass('even');
});

If we declare background colors for the odd and even classes as follows, we can see the rows in alternating shades of gray:

tr.even {
  background-color: #eee;
}
tr.odd {
  background-color: #ddd;
}

While this code works fine for simple table structures, if we introduce non-standard rows into the table, such as sub-headings, the basic odd-even pattern no longer suffices. For example, suppose we have a table of news items grouped by year, with columns for date, headline, author, and topic. One way to express this information is to wrap each year’s news items in a <tbody> element and use <th colspan="4"> for the subheading. Such a table’s HTML (in abridged form) would look like this:

<table class="striped...