Search by category add on for WPMU Events+

Search by category add on for WPMU Events+.php

<?php
/*
Plugin Name: Search by Category
Description: Add a search form where users can search by category
Plugin URI: http://premium.wpmudev.org/project/events-and-booking
Version: 1.0
AddonType: Events
Author: WPMU DEV
*/

class Eab_Events_SearchByCategory {
	private function __construct () {
            add_shortcode( 'eab_search_by_cat', array( $this, 'eab_search_by_cat_cb' ) );
            add_filter( 'the_content', array( $this, 'show_search_content' ) );
        }
	
	public static function serve () {
	    $me = new Eab_Events_SearchByCategory;
	}
        
        public function eab_search_by_cat_cb( $atts ) {
            
            $atts = shortcode_atts( array(
                'search_term' => '',
                'cat_id' => '',
            ), $atts );
            
            $terms = get_terms( 'eab_events_category' );
            
            $html = '<div class="eab_search_by_cat">';
                $html .= '<form action="" method="get">';
                    $html .= '<div class="eab_main">';
                        $html .= '<div class="eab_main_col">';
                            $html .= '<input type="text" name="ev_s" value="' . $atts['search_term'] . '">';
                        $html .= '</div>';
                        $html .= '<div class="eab_main_col">';
                            $html .= '<select name="ev_s_cat">';
                                $html .= '<option value="">Select a category</option>';
                            foreach( $terms as $term ){
                                $html .= '<option ' . ( ( $atts['cat_id'] == $term->term_id ) ? 'selected="selected"' : '' ) . ' value="' . $term->term_id . '">' . $term->name . '</option>';
                            }
                            $html .= '</select>';
                        $html .= '</div>';
                        $html .= '<div class="eab_main_col">';
                            $html .= '<input type="submit" name="ev_search_submit">';
                        $html .= '</div>';
                    $html .= '</div>';
                $html .= '</form>';
            $html .= '</div>';
            $html .= '<style>';
                $html .= '.eab_main_col{width: 33%; float: left; box-sizing: border-box;}';
                $html .= '.eab_main{overflow: hidden;}';
                $html .= '.eab_search_by_cat{margin-bottom: 20px;}';
            $html .= '</style>';
            return $html;
        }
        
        public function show_search_content( $content ) {
            $html = '';
            if( isset( $_REQUEST['ev_s'] ) ){
                $html .= '<div class="eab_search_wrap">';
                    $html .= '<div class="search_form">';
                        $html .= do_shortcode( '[eab_search_by_cat search_term=' . $_REQUEST['ev_s'] . ' cat_id=' . $_REQUEST['ev_s_cat'] . ']' );
                    $html .= '</div>';
                    $html .= '<div class="search_result">';
                        if( ! empty( $_REQUEST['ev_s_cat'] ) ){
                            $args = array(
                                      'post_type'   => 'incsub_event',
                                      's'           => $_REQUEST['ev_s'],
                                      'tax_query'   => array(
                                                            array(
                                                                    'taxonomy' => 'eab_events_category',
                                                                    'field'    => 'term_id',
                                                                    'terms'    => $_REQUEST['ev_s_cat']
                                                                )  
                                                            )
                                      );
                        }
                        else{
                            $args = array(
                                      'post_type'   => 'incsub_event',
                                      's'           => $_REQUEST['ev_s']
                                      );
                        }
                        
                        $search_query = new WP_Query( $args );
                        $posts = $search_query->posts;
                        
                        if( count( $posts ) < 1 ) $html .= '<p>No events found.</p>';
                        else{
                            $html .= '<ul>';
                                foreach( $posts as $post ){
                                    $html .= '<li>';
                                        $html .= '<a href="' . get_permalink( $post->ID ) . '">';
                                            $html .= $post->post_title;
                                        $html .= '</a>';
                                    $html .= '</li>';
                                }
                            $html .= '</ul>';
                        }
                    $html .= '</div>';
                $html .= '</div>';
                $html = apply_filters( 'eab_search_events_by_cat_html', $html, $posts );
            }else{
                $html = $content;
            }
            return $html;
        }
	
}
Eab_Events_SearchByCategory::serve();


/**
 * Adds Event Search by Category widget.
 */
class EAB_search_by_cat_Widget extends WP_Widget {

	/**
	 * Register widget with WordPress.
	 */
	function __construct() {
		parent::__construct(
			'EAB_search_by_cat_Widget',
			'Search Events by Category',
			array( 'description' => 'A widget to search events by category', )
		);
	}

	/**
	 * Front-end display of widget.
	 *
	 * @see WP_Widget::widget()
	 *
	 * @param array $args     Widget arguments.
	 * @param array $instance Saved values from database.
	 */
	public function widget( $args, $instance ) {
	
     	        echo $args['before_widget'];
		if ( ! empty( $instance['title'] ) ) {
			echo $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ). $args['after_title'];
		}
		echo do_shortcode( '[eab_search_by_cat search_term=' . ( isset( $_REQUEST['ev_s'] ) ? $_REQUEST['ev_s'] : '' ) . ' cat_id=' . ( isset( $_REQUEST['ev_s_cat'] ) ? $_REQUEST['ev_s_cat'] : '' ) . ']' );
		echo $args['after_widget'];
	}

	/**
	 * Back-end widget form.
	 *
	 * @see WP_Widget::form()
	 *
	 * @param array $instance Previously saved values from database.
	 */
	public function form( $instance ) {
     	        $title = ! empty( $instance['title'] ) ? $instance['title'] : __( 'Widget title', 'text_domain' );
		?>
		<p>
		<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label> 
		<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>">
		</p>
		<?php 
	}

	/**
	 * Sanitize widget form values as they are saved.
	 *
	 * @see WP_Widget::update()
	 *
	 * @param array $new_instance Values just sent to be saved.
	 * @param array $old_instance Previously saved values from database.
	 *
	 * @return array Updated safe values to be saved.
	 */
	public function update( $new_instance, $old_instance ) {
		$instance = array();
		$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';

		return $instance;
	}

}

function register_EAB_search_by_cat_Widget_widget() {
    register_widget( 'EAB_search_by_cat_Widget' );
}
add_action( 'widgets_init', 'register_EAB_search_by_cat_Widget_widget' );