Create Custom Post Type and Set to Display on Specific Pages

May 14, 2015

add_action('init', 'register_post_types');
function register_post_types() {

	$labels = array(
		'name' => _x('Widgets', 'post type general name'),
		'singular_name' => _x('Widget', 'post type singular name'),
		'add_new' => _x('Add New Widget', 'Widget'),
		'add_new_item' => __('Add New Widget'),
		'edit_item' => __('Edit Widget'),
		'new_item' => __('New Widget'),
		'all_items' => __('All Widgets'),
		'view_item' => __('View Widget'),
		'search_items' => __('Search Widgets'),
		'not_found' =>  __('No Widgets found'),
		'not_found_in_trash' => __('No Widgets found in Trash'), 
		'parent_item_colon' => '',
		'menu_name' => __('Widgets')
	);
	
	$args = array(
		'labels' 		=> $labels,
		'public' 		=> true,
		'publicly_queryable' 	=> true,
		'show_ui' 		=> true, 
		'show_in_menu' 		=> true, 
		'query_var' 		=> true,
		'rewrite' 		=> array('slug'=>'widgets'),
		'has_archive' 		=> true, 
		'hierarchical' 		=> false,
		'menu_position' 	=> null,
		'supports' 		=> array( 'title', 'editor', 'thumbnail', 'custom-fields', 'revisions' ), 
		'public'		=> true,
	);
	register_post_type('widgets',$args);
}

add_action('add_meta_boxes','build_sidebar_meta_box');
	
function build_sidebar_meta_box() {

	add_meta_box( 'page_select_box', 'Shown on these pages', 'page_select_box', 'widgets', 'side', 'default' );
	
}

function page_select_box($post) {

	$all_pages = get_pages();
	$selected_pages = explode(',',get_post_meta($post->ID,'page_display',true));
	
	$show_in_dropdown = get_post_meta($post->ID,'show_in_dropdown',true);
	$all_pages_checked = '';
	if($selected_pages[0] == 'all_pages') {
			$all_pages_checked = ' checked="checked" ';
	} ?>
	
<script type="text/javascript">
    var lastChecked = null;

    jQuery(document).ready(function() {
        var jQuerychkboxes = jQuery('.display_page_checkbox');
        jQuerychkboxes.click(function(event) {
            if(!lastChecked) {
                lastChecked = this;
                return;
            }

            if(event.shiftKey) {
                var start = jQuerychkboxes.index(this);
                var end = jQuerychkboxes.index(lastChecked);

                jQuerychkboxes.slice(Math.min(start,end), Math.max(start,end)+ 1).attr('checked', lastChecked.checked);

            }
            lastChecked = this;
        });
    });
</script>

	<br />
	<input type="checkbox" value="show_on_all_pages" name="show_on_all_pages" <?php echo $all_pages_checked; ?>/><label for="show_on_all_pages"> Show on all pages.</label>
		
		<?php wp_nonce_field('sidebar_widget_nonce','sidebar_widget_nonce'); ?>
		
		<p>Visible on the following pages:</p>
		<ul style="background:white; border:1px solid #ddd; padding:5px;max-height:400px;overflow:auto">
	
	<?php 
	foreach($all_pages as $p){
		$checked = '';
		
		if(in_array($p->ID,$selected_pages)) {
			$checked = ' checked="checked" ';
		}
	
		echo '<li><input type="checkbox" name="sidebar_display_page[]" '.$checked.' value="'.$p->ID.'" class="display_page_checkbox"/> <label for="'.$p->post_title.'">'.$p->post_title.'</label></li>';
	} ?>
	</ul>
	<p>
	Shift + Click check boxes to select all in between checkboxes.
	</p>
<?php }

add_action( 'save_post', 'save_sub_page_widget' );

/* When the post is saved, saves our custom data */
function save_sub_page_widget( $post_id ) {
  // verify if this is an auto save routine. 
  // If it is our form has not been submitted, so we dont want to do anything
  if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
      return;

  // verify this came from the our screen and with proper authorization,
  // because save_post can be triggered at other times

  if ( !wp_verify_nonce( $_POST['sidebar_widget_nonce'], 'sidebar_widget_nonce' ) )
      return;


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

  // OK, we're authenticated: we need to find and save the data
  
  $mydata = $_REQUEST['sidebar_display_page'];

  // Do something with $mydata 
	while (list ($key_check,$val_check) = @each ($mydata)){
		$value_check .= $val_check.",";
	}
 
	$all_value_check = substr($value_check, 0, -1);  
 
	$page_display = $all_value_check;
	
	if($_POST['show_on_all_pages']){
		$page_display = 'all_pages';
	}
	
	
	// save to meta field
	update_post_meta($post_id,'page_display',$page_display);
  

}

function display_sub_page_widgets($get_count  = false){

	$args = array( 'post_type' => 'widgets','numberposts'=>-1 );
	$sub_page_widgets = get_posts( $args );
				
	global $post;
	$temp_post = $post;
	$widget_count = 0;
					
	$current_page_id = get_the_ID();
					
	foreach($sub_page_widgets as $post){
		setup_postdata($post);

		$selected_pages = explode(',',get_post_meta(get_the_ID(),'page_display',true));
		 $bypass = false;

		 if($selected_pages[0] == 'all_pages'){
			$bypass = true;
		 }

		if(in_array($current_page_id,$selected_pages) || $bypass == true){
						
			$link = get_post_meta(get_the_ID(),'widget_link',true);
			$video_box = get_post_meta(get_the_ID(),'video_box',true);
			$widget_img = get_post_meta(get_the_ID(),'widget_img',true);
			echo '<div class="sub_page_widget '.$widget_img.'">';
							
				echo '<a href="'.$link.'" class="'.$video_box.'">';
				the_post_thumbnail();
				echo '</a>';
								
				echo '<h3><a href="'.$link.'" class="'.$video_box.'">'.get_the_title().'</a></h3>';
				/* the_content(); */
			/* } */
			echo '</div>';
		}							
						
						
		$widget_count ++;
	}	

	$post = $temp_post;
}


function has_sub_page_widgets(){

	$args  = array('post_type'=>'widgets');
	
	$all_widgets = get_posts($args);
	$has_widgets = false;
	global $post;
	$current_page_id = $post->ID;
	foreach($all_widgets as $widget){
	
		$selected_pages = explode(',',get_post_meta($widget->ID,'page_display',true));
		 $bypass = false;

		 if($selected_pages[0] == 'all_pages'){
		 	$bypass = true;
		 }
	
		if(in_array($current_page_id,$selected_pages) || $bypass == true){
			$has_widgets  = true;
		}							
							
	}
	
	return $has_widgets;
}

Then to display the content:

<?php display_sub_page_widgets(false,true,4); ?>