MetaBox class

gistfile1.txt

<?php
$MF_MetaFields; //global defined to store meta ID's 

class MetaBox{
	protected $options = array(); //for storing all options
	protected $id; //unique string ID for naming field
	protected $title; //Box Title
	protected $posttype; //Array (list, of, post, types) to attach to 
	protected $context;//Optional. normal, or side
	protected $priority = "low";//optional
	protected $prefix;//database prefix to avoid conflict
	protected $fields; /* Array of arrays or multiple fields.
														* Fields Excepted args
														*
														* array(
														* 'name' => 'Default',
														* 'desc' => "<p>this is a default metabox</p>",
														* 'id' => $this->prefix . 'date',
														* 'type' => 'text')
														*/
	
	
	
	function __construct($id, array $fields, $prefix, array $posttype = array('post','page'),  $title  = "Meta Box", $context = "normal",$priority = "low"){
		
		if(!is_string($id) || !is_string($prefix) || !is_string($title) || !is_string($context) || !is_string($priority)) die ("Field should be string");
		add_action('save_post', array(&$this, 'save'));
		$this->id = $id;
		$this->fields = $fields;
		$this->prefix = $prefix;
		$this->posttype = $posttype;
		$this->title = $title;
		$this->context = $context;
		$this->priority = $priority;
		$this->set_option();
		$this->get_meta_boxes();
		$this->add();
		
		
		do_action("mf_meta_loaded");
	}
	
	function add(){

	foreach ($this->posttype as $posttype){
		add_meta_box($this->id, $this->title, array(&$this, 'show'), $posttype, $this->context, $this->priority);
	}
	
	}
		
	function show(){
		global $post;
		
	
		
		$echo = '<table class="form-table">';
		
	
		foreach($this->fields as $field){
			
			
			
			$echo .= '<tr><th style="width:20%"><label for="'. $field['id'].'">'.$field['name'].'</label></th><td>';
			$meta = get_post_meta($post->ID, $field['id'], true);
			
			switch($field['type']){
				case 'select':
					$this->option_check($field);
					$echo .= '<select name="'.$field['id'].'" id="'.$field['id'].'">';
					foreach ($field['options'] as $k => $v) {
						$echo .= '<option value="'.$k.'" '.($meta == $k ? ' selected="selected"' : '').'>'.$v.'</option>';
					}
					$echo .= '</select>';
				
					break;
			
				case 'text':
					$echo .= '<input type="text" name="'.$field['id'].'" id="'.$field['id'].'" value="'.($meta ? $meta : $field['std']). '" size="30" style="width:15%" /><p>'.$field['desc'].'</p>';
				break;
			
				case 'wide-text':
					$echo .= '<input type="text" name="'.$field['id'].'" id="'.$field['id'].'" value="'.($meta ? $meta : $field['std']). '" size="30" style="width:85%" /><p>'.$field['desc'].'</p>';
				break;
			
				case 'toggle':
					$echo .= '<input type="checkbox" name="'.$field['id'].'" id="'.$field['id'].'"'.($meta ? ' checked="checked"' : '').' />';
				break;
			
				case 'checkbox':
					$this->option_check($field);
					if (!$meta){
					$meta = array();
					}
					foreach ($field['options'] as $k=>$v){
						$echo .= '<label for="'.$v.'">'.$v.'</label>';
						$echo .= '<input type="checkbox" name="'.$field['id'].'[]"value="'.$k.'" id="'.$k.'"'.(in_array($k,$meta) ? ' checked="checked"' : '').' /><br />';
					}
					break;
		
					case 'radio':
						$this->option_check($field);
						foreach ($field['options'] as $option) {
							$echo .= '<input type="radio" name="'.$field['id'].'" value="'.$option['value'].'"'.($meta == $option['value'] ? ' checked="checked"' : '').' />'.$option['name'];
						}
					break;
			
					$echo .= '<td></tr>';
			}
		}
		$echo .= '</table>';
		
		echo $echo;
		
	}
		
	protected function option_check($field, $message = '$field array must contain option array to use '){
		if(!is_array($field['options']) || !isset($field['options']) || !$field['options']) die ($message.$field['type']);
		return true;
	}
	
	function save($post_id) {
		
		// check autosave
		if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
			return $post_id;
		}

		// check permissions
		if ('page' == $_POST['post_type']) {
			if (!current_user_can('edit_page', $post_id)) {
	
			return $post_id;
			}
		} elseif (!current_user_can('edit_post', $post_id)) {
			return $post_id;
		}

		foreach ($this->fields as $field) {

			$old = get_post_meta($post_id, $field['id'], true);
	     	$new = $_POST[$field['id']];

			if($field['type'] == "checkbox"){
				foreach($field['options'] as $k=>$v){
					update_post_meta($post_id, $field['id'], $new);
				}
				return;
			}
	
			if ($new && $new != $old) {
				update_post_meta($post_id, $field['id'], $new);
				} elseif ('' == $new && $old) {
					delete_post_meta($post_id, $field['id'], $old);
				}
			}
	}
	
	static function connect_to_post_type($type, $alt_query = false){
		if(!is_string($type)) die ("type must be string");
		global $wpdb;
		$meta_array = array();
		
		if($alt_query && is_string($alt_query)){
			$query = $alt_query;
		} elseif($alt_query === false){
			$query = "SELECT post_title, ID FROM $wpdb->posts WHERE post_type='$type' AND post_status ='publish'";
		} else {
			die  ("Query must be a string");
		}
		


		$meta_query= $wpdb->get_results($query);

		foreach ($meta_query as $object){
			$i = get_object_vars($object);
			$meta_array[$i['ID']]=$i['post_title'];

		}
		if (count($meta_array)<1) $meta_array[0]='No '.$type.' Found!';//*/
			return $meta_array;
		
	}
	
	protected function set_option(){
		$options = get_option('mf_meta_fields');
		
		foreach($this->posttype as $type){//create options list
			foreach($this->fields as $field){
				$this->options[$this->id][$type][] = $field['id'];
			}
		}
		
		
		if($options){
			$this->options = array_merge($this->options, $options);
			update_option('mf_meta_fields',$this->options);
		} else {
			add_option('mf_meta_fields',$this->options);
		}
			
		
	}

	static function get_meta_boxes(){
		global $MF_MetaFields;
		$MF_MetaFields = get_option('mf_meta_fields');
		return $MF_MetaFields;
	}
}

function demo_define_meta_box(){
	$id="program_meta";//
	$title = "Program Meta";//Box Title
	$page = array('Program');//Section to attach metbox to (page, post or custom)
	$context = 'side';
	$priority = 'high';
	$prefix = 'mf_SALF_meta_';
	$fields = array(
										array(
											'name' => 'Featured',
											'id' => $prefix . 'featured',
											'type' => 'toggle',
											'desc' => "<p>Place in the Carousel. Limited spaces.</p>"
											),
										array(
											'name' => 'Price',
											'id' => $prefix . 'price',
											'type' => 'text'
											),
										array(
											'name' => 'Venue',
											'id' => $prefix . 'venue',
											'type' => 'select',
											'options' => MetaBox::connect_to_post_type('post')
											),
										array(
											'name' => 'Event Type',
											'id' => $prefix . 'type',
											'many' => true,
											'type' => 'select',
											'options' => MetaBox::connect_to_post_type('Events')
											),
										array(
											'name' => 'Ticket ID',
											'desc' => '<p>Enter Ticket ID</p>',
											'id' => $prefix . 'ticket_ID',
											'type' => 'wide-text'
											),
										array(
											'name' => 'Sponsor',
											'id' => $prefix . 'sponsor',
											'type' => 'checkbox',
											'options' => MetaBox::connect_to_post_type('Sponsors')
											)
									);//*/
									


	$program_metabox = new MetaBox($id,$fields,$prefix);
}

function create_new_meta_boxes(){
	
	//demo_define_meta_box();
}


add_action('init',array('MetaBox','get_meta_boxes'));//load meta ID's and store in global array
add_action('admin_menu','create_new_meta_boxes');
?>