WPMU Events+ category filter add on calendar view

code.php

<?php
/*
Plugin Name: Event Calendar Category Filter
Description: Filter by category in the calendar
Plugin URI: http://premium.wpmudev.org/project/events-and-booking
Version: 0.25
Author: WPMU DEV
AddonType: Events
*/

/*
Detail: This add on will add a category filter in the event calendar archive

*/

class Eab_Events_EventCategoryFilter {

	private $_data;

	/**
	 * Constructor
	 */	
	private function __construct () {
		$this->_data = Eab_Options::get_instance();
		add_action( 'wp_footer', array( $this, 'eab_cat_filter' ) );
	}

	/**
	 * Run the Addon
	 *
	 */	
	public static function serve () {
		$me = new Eab_Events_EventCategoryFilter;
	}
	
	public function eab_cat_filter() {
		$terms = get_terms( 'eab_events_category' );
		
		$html = '<div class="eab_cat_list"><ul>';
		$html .= '<li><a id="cat_all" href="#">Show all</a></li>';
		
		foreach( $terms as $term ){
			$html .= '<li><a id="cat_'. $term->slug .'" href="#">' . $term->name . '</a></li>';
		}
		
		$html .= '</div></ul>';
		
		?>
		<script type="text/javascript">
		jQuery(function($) {
			if($('.eab-monthly_calendar.eab-shortcode_calendar').length) {
				$('.eab-monthly_calendar.eab-shortcode_calendar').before( '<?php echo $html ?>' );
				
				$('.eab_cat_list li a').click(function(e){
					e.preventDefault();
					var id = $(this).attr( 'id' ).split('cat_')[1];
					
					if( id != 'all' ){
						$('a.wpmudevevents-calendar-event').fadeIn();
						$('a.wpmudevevents-calendar-event').not('.' + id).fadeOut();
					}else{
						$('a.wpmudevevents-calendar-event').fadeIn();
					}
					
					return false;
				});
			}
		});
		</script>
		<style>
		.eab_cat_list{margin-bottom: 25px; overflow: hidden}
		.eab_cat_list ul{list-style-type: none !important; margin: 0;}
		.eab_cat_list ul li{float: left; margin-right: 20px;}
		</style>
		<?php
	}
	
	

}

Eab_Events_EventCategoryFilter::serve();