Chosen.js for CMB Taxonomy field

kd-chosen-cmb-taxonomy.php

<?php
/**
 * Plugin Name: KD Example!
 * Version: v0.1
 * Author: Kelly Dwan 
 * Author URI: http://redradar.net/
 * Description: Using Chosen + Custom Meta Boxes
 */

class KD_Example_Class {
	protected $prefix = 'kd_example_';
	protected $post_type = 'post';
	protected $taxonomy = 'category';
	
	public function __construct() {
		add_action( 'admin_enqueue_scripts', array( $this, 'includes'), 10, 1 );
		
		add_action( 'init', array( $this, 'initialize_cmb_meta_boxes' ), 9999 );
		add_filter( 'cmb_render_chosen_taxonomy', array( $this, 'render_chosen_taxonomy' ), 10, 2 );
		add_filter( 'cmb_validate_chosen_taxonomy', array( $this, 'validate_chosen_taxonomy' ), 10, 3 );
		add_filter( 'cmb_meta_boxes', array( $this, 'add_meta_boxes' ) );
		add_action( 'do_meta_boxes', array($this, 'remove_meta_boxes'), 10, 3 );
	}

	/**
	 * Add chosen to the edit screen for our new Item CPT
	 */
	public function includes($hook){
		global $post;
		if ( $hook == 'post-new.php' || $hook == 'post.php' ) {
			if ( $this->post_type === $post->post_type ) {     
				wp_enqueue_script(  'chosen', plugins_url('libs/chosen/chosen.jquery.min.js',__FILE__), array( 'jquery' ), '1.0' );
				wp_enqueue_style( 'chosen', plugins_url('libs/chosen/chosen.css',__FILE__) );
			}
		}

	}
	
	// Initialize the metabox class
	function initialize_cmb_meta_boxes() {
		if ( !class_exists( 'cmb_Meta_Box' ) ) {
			require_once( 'libs/cmb-library/init.php' );
		}
	}
	
	function render_chosen_taxonomy( $field, $meta ) {
		global $post;?>
		<script type="text/javascript">
		jQuery(document).ready(function($){
			$( '.chzn-select' ).chosen();
		});
		</script><?php
		echo '<select name="', $field['id'], '[]" id="', $field['id'], '" class="chzn-select widefat" multiple>';
		$current_terms = wp_get_post_terms ( $post->ID, $field['taxonomy'], array('fields' => 'ids') );
		$terms = get_terms( $field['taxonomy'], 'hide_empty=0' );
		foreach ( $terms as $term ) { 
			?>
			<option value="<?php echo $term->slug; ?>"<?php selected( in_array( $term->term_id, $current_terms ) ); ?>><?php echo $term->name; ?></option>
			<?php
		}
		echo '</select>';
		echo '<p class="cmb_metabox_description">', $field['desc'], '</p>';
	}
	
	function validate_chosen_taxonomy( $new, $post_id, $field ) {
		return wp_set_object_terms( $post_id, $new, $field['taxonomy'] );
	}
	
	function add_meta_boxes( $meta_boxes ) {
		$meta_boxes[] = array(
			'id' => $this->prefix.'item_metabox',
			'title' => 'Information',
			'pages' => array($this->post_type),
			'context' => 'normal',
			'priority' => 'high',
			'show_names' => true, // Show field names on the left
			'fields' => array(
				array(
					'name' => 'Categories',
					'id' => 'chosen_'.$this->taxonomy,
					'type' => 'chosen_taxonomy',
					'taxonomy' => $this->taxonomy
				),
			)
		);
		return $meta_boxes;
	}
	
	/**
	 * Since we're adding the Menu taxonomy in the CMB 'Info' box, we should hide the default tax box
	 * I also generally hide the custom fields box when using CMB, because I don't want extra fields created.
	 */
	function remove_meta_boxes( $post_type, $priority, $post ) {
		remove_meta_box( $this->taxonomy.'div', $this->post_type, 'side' ); // remove tax box
		remove_meta_box( 'postcustom', $this->post_type, 'normal'); // remove custom fields
	}
}
new KD_Example_Class;