jQuery - Use an appended dropdown to hide content using classes

script.js

	// Loops through the tabs and if true, run function to create dropdown
	$( '.tab-wrap > .panel' ).each(function( index, value ) {
		if ( $( '.header-only', value ).length > 1 ) {
			yearsfilter( value );
		}
	})

	function yearsfilter( panel ) {
	  // Creates dropdown
		$( panel ).prepend('<div class="contact-filter"><div class="sc-filtering"><select class="theyears filters-select"><option value="">Show All</option></select></div></div>');
		// Loops through each section finding the title
		$( '.header-only', panel ).each(function( index, value ) {
		  // Creates the option for the dropdowbn
			$('.theyears', panel ).append( '<option value="' + $( value ).text().trim() + '">' + $( value ).text().trim() + '</option>');
			// When option is selected, goes up through the divs to find the group class
			$( '.fl-module-ctas-download-bar-columns', $( value ).closest( '.fl-col-group' ).next( '.fl-col-group' ) ).each(function( iindex, ivalue ) {
			  // Adds class to the group container with the year its title shows
				$( ivalue ).addClass( 'filteritem_' + $( value ).text().trim() );
				// Adds class to the title with the year it shows
				$( value ).addClass( 'filteritem_' + $( value ).text().trim() );
			});
		});
	};
	  // Hides not selected years
		$('.theyears').change(function() {
		// Variable for the select year
		var selectedyear = $( this ).val();
		// Show All option
		if ( selectedyear == "" ) {
			$( '.header-only' ).show();
			$( '.fl-module-ctas-download-bar-columns' ).show();
		} else {
		  // Hide group panel of years not selected
			$( '.fl-module-ctas-download-bar-columns', $( this ).closest( '.panel' ) ).hide();
			// Hide titles of years not selected
			$( '.header-only', $( this ).closest( '.panel' ) ).hide();
			// Show group panel of years not selected
			$( '.fl-module-ctas-download-bar-columns.filteritem_' + selectedyear, $( this ).closest( '.panel' ) ).show();
			// Show titles of years not selected
			$( '.header-only.filteritem_' + selectedyear, $( this ).closest( '.panel' ) ).show();
		}
	});