Script that creates THEAD out of THs in first row if one is not present (or creates a blank one) for jQuery DataTables

tableToRWD.js

/*
x20170622 - sullivtm - 22 June 2017 
Uses SpryMedia's Datatables jQuery Plug-in. 
TO USE: Put this on a page with a plain table and add class="RWDtable" to the table tag. If a thead is not present, 
one will be created out of the first row of THs or a blank one will be added so SpryMedia's DataTable plug-in works. 
Do not use colspan for table cells. 
Supports multiple tables on one page.
*/
$(document).ready(function(){ 
	$('table.RWDtable').each(function() {
		if ($(this).find('tbody').length === 0){
			$(this).wrap('<tbody/>'); 
		}
		if ($(this).find('thead').length === 0){
			var firstrow = $(this).find('tbody tr:first'); 
			if (firstrow.find('th').length > 0) { // if first row has th tags
				firstrow.wrap('<thead/>').parent().prependTo($(this)); // wrap with thead, get tbody, append to table
			} else { //if not, make an empty thead row
				var thead = firstrow.clone(); 
				thead.children().empty(); 
				thead.children('td').replaceWith(function() {return '<th></th>';}); 
				thead.wrap('<thead/>').parent().prependTo($(this)); 
			}
		}
	});
	$('.RWDtable').DataTable( { responsive: true, paging: false, searching: false, info: false, ordering: false  } );
	$('.RWDtable').css('width','100%');
});