Как сами да си създадем Widget в WordPress

Отворете functions.php на Вашата тема и поставете следния код:

require get_template_directory() . '/widgets/agenda.php';

agenda.php

<?php
class agenda_widget extends WP_Widget {

	function agenda_widget() {
		parent::WP_Widget(false, $name = 'Get posts from different post types');
	}

	function widget($args, $instance){
		extract( $args );
		$title = apply_filters('widget_title', $instance['title']);
		$posttype = $instance['posttype'] ? $instance['posttype'] : 'post';
		
		$orderby = $instance['orderby'] ? $instance['orderby'] : 'ID';
		$orderbyad = $instance['orderbyad'] ? $instance['orderbyad'] : 'ASC';
		
		
		$limit = $instance['limit'] ? $instance['limit'] : 5;
		$bottom = $instance['bottom'];

		$args = array( 'posts_per_page' => $limit, 'orderby' => $orderby, 'order'=>$orderbyad, 'post_type' => $posttype);
		query_posts($args);
		$trainingen = get_posts( $args );

		?>
		<?php echo $before_widget; ?>
		<div class="widget-agenda">
			<h3><?php echo $title ?></h3>
			<ul>
			<?php foreach ($trainingen as $training): ?>
				<?php if($training->dates) $dates = json_decode($training->dates) ?>
				<li><a href="<?php echo get_permalink($training->ID)?>"><?php //echo date_i18n(get_option("date_format"), strtotime($dates[0])) ?><?php _e($training->post_title); ?></a></li>
			<?php endforeach; ?>
			</ul>
		</div>
		<?php echo $after_widget; ?>
		<?php
	}

	function update($new_instance, $old_instance){
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['posttype'] = strip_tags($new_instance['posttype']);
		$instance['orderby'] = strip_tags($new_instance['orderby']);
		$instance['orderbyad'] = strip_tags($new_instance['orderbyad']);
		$instance['limit'] = strip_tags($new_instance['limit']);
		
		return $instance;
	}

	function form($instance){
		$title = esc_attr($instance['title']);
		$posttype = esc_attr($instance['posttype']);
		$orderby = esc_attr($instance['orderby']);
		$orderbyad = esc_attr($instance['orderbyad']);
		$limit = esc_attr($instance['limit']);
		
		?>
		 <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 $title; ?>" />
		</p>
        
        <p>
			<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Select Post Type:'); ?></label> 
			<?
           		$args = array(
   					'public'   => true,
   					'_builtin' => false
				);

				$output = 'names'; // names or objects, note names is the default
				$operator = 'and'; // 'and' or 'or'

				$post_types = get_post_types( $args, $output, $operator ); 

				?>
				<select id="<?php echo $this->get_field_id('posttype'); ?>" name="<?php echo $this->get_field_name('posttype'); ?>">
                <option value="post" <? if ($posttype == 'post'){ ?>selected<? } ?>>post</option>
				<?
				foreach ( $post_types  as $post_type ) 
				{
   					?>
                     <option value="<?=$post_type;?>" <? if ($posttype == $post_type){ ?>selected<? } ?>><?=$post_type;?></option>
                    <?
				}
				?>
            	</select></br>
                <label for="<?php echo $this->get_field_id('orderby'); ?>"><?php _e('Order by'); ?></label>: <select id="<?php echo $this->get_field_id('orderby'); ?>" name="<?php echo $this->get_field_name('orderby'); ?>">
  							<option value="ID" <? if ($orderby == 'ID'){ ?>selected<? } ?>>ID</option>
						</select></br>
                <label for="<?php echo $this->get_field_id('orderbyad'); ?>"><?php _e('Order'); ?></label>: <select id="<?php echo $this->get_field_id('orderbyad'); ?>" name="<?php echo $this->get_field_name('orderbyad'); ?>">
  							<option value="ASC" <? if ($orderbyad == 'ASC'){ ?>selected<? } ?>>ASC</option>
                            <option value="DESC" <? if ($orderbyad == 'DESC'){ ?>selected<? } ?>>DESC</option>
					  </select>      
                        
		</p>
        
		<p>
			<label for="<?php echo $this->get_field_id('limit'); ?>"><?php _e('Limit'); ?></label> 
			<input class="tiny-text" id="<?php echo $this->get_field_id('limit'); ?>" name="<?php echo $this->get_field_name('limit'); ?>" type="number" value="<?php echo $limit; ?>" />
		</p>
		<?php 
	}


}

add_action('widgets_init', create_function('', 'return register_widget("agenda_widget");'));

?>