advanced-cat.php

<?php
/*
Plugin Name: Advanced Categories
Description: Add options to make a more sorted list of categories.
Version: 1.0
Author: Dreb Bits
Author URI: http://drebbits.com
*/

/**
 * Advanced Categories Widget
 * init used in: Summerlin South Living
 *
 * @since 2.8.0
 */
class WP_Widget_Advanced_Categories extends WP_Widget {

	function WP_Widget_Advanced_Categories () {
		$widget_ops = array( 'classname' => 'widget_categories', 'description' => __( "An enhanced list or dropdown of categories." ) );
		
		/* Create the widget. */
		$this->WP_Widget( 'adv_categories', __('Advanced Categories'), $widget_ops );
	}

	function widget( $args, $instance ) {
		extract( $args );

		/** This filter is documented in wp-includes/default-widgets.php */
		$title = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Advanced Categories' ) : $instance['title'], $instance, $this->id_base );

		$c = ! empty( $instance['count'] ) ? '1' : '0';
		$h = ! empty( $instance['hierarchical'] ) ? '1' : '0';
		$d = ! empty( $instance['dropdown'] ) ? '1' : '0';
		$p = ! empty( $instance['parent_cat'] ) ? $instance['parent_cat'] : '0';

		echo $before_widget;
		if ( $title )
			echo $before_title . $title . $after_title;

		$cat_args = array('orderby' => 'name', 'show_count' => $c, 'hierarchical' => $h);

		if( $p ) $cat_args['child_of'] = $p;

		if ( $d ) {
			$cat_args['show_option_none'] = __('Select Category');

			/**
			 * Filter the arguments for the Categories widget drop-down.
			 *
			 * @since 2.8.0
			 *
			 * @see wp_dropdown_categories()
			 *
			 * @param array $cat_args An array of Categories widget drop-down arguments.
			 */
			wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args ) );
?>

<script type='text/javascript'>
/* <![CDATA[ */
	var dropdown = document.getElementById("cat");
	function onCatChange() {
		if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {
			location.href = "<?php echo home_url(); ?>/?cat="+dropdown.options[dropdown.selectedIndex].value;
		}
	}
	dropdown.onchange = onCatChange;
/* ]]> */
</script>

<?php
		} else {
?>
		<ul>
<?php
		$cat_args['title_li'] = '';

		/**
		 * Filter the arguments for the Categories widget.
		 *
		 * @since 2.8.0
		 *
		 * @param array $cat_args An array of Categories widget options.
		 */
		wp_list_categories( apply_filters( 'widget_categories_args', $cat_args ) );
?>
		</ul>
<?php
		}

		echo $after_widget;
	}

	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['count'] = !empty($new_instance['count']) ? 1 : 0;
		$instance['hierarchical'] = !empty($new_instance['hierarchical']) ? 1 : 0;
		$instance['dropdown'] = !empty($new_instance['dropdown']) ? 1 : 0;
		$instance['parent_cat'] = !empty($new_instance['parent_cat']) ? $new_instance['parent_cat'] : -1;

		return $instance;
	}

	function form( $instance ) {
		//Defaults
		$instance = wp_parse_args( (array) $instance, array( 'title' => '') );
		$title = esc_attr( $instance['title'] );
		$count = isset($instance['count']) ? (bool) $instance['count'] :false;
		$hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;
		$dropdown = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;
		$parent_cat = isset( $instance['parent_cat'] ) ? $instance['parent_cat'] : -1;
?>
		<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><input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('dropdown'); ?>" name="<?php echo $this->get_field_name('dropdown'); ?>"<?php checked( $dropdown ); ?> />
		<label for="<?php echo $this->get_field_id('dropdown'); ?>"><?php _e( 'Display as dropdown' ); ?></label><br />

		<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('count'); ?>" name="<?php echo $this->get_field_name('count'); ?>"<?php checked( $count ); ?> />
		<label for="<?php echo $this->get_field_id('count'); ?>"><?php _e( 'Show post counts' ); ?></label><br />

		<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('hierarchical'); ?>" name="<?php echo $this->get_field_name('hierarchical'); ?>"<?php checked( $hierarchical ); ?> />
		<label for="<?php echo $this->get_field_id('hierarchical'); ?>"><?php _e( 'Show hierarchy' ); ?></label><br />

		<label for="<?php echo $this->get_field_id('parent-cat'); ?>"><?php _e( 'Show categories under' ); ?></label>&nbsp;
<?php
		$cat_select_args = array(
				'show_option_none' => __('Select Category'),
				'depth' => 1,
				'hide_empty' => 0,
				'hierarchical' => 1,
				'id' => $this->get_field_id('parent-cat'),
				'name' => $this->get_field_name('parent_cat'),
				'selected' => $parent_cat
			);

		wp_dropdown_categories( $cat_select_args );

		echo "</p>";
	}

}

/**
 * init widget
 **/

add_action( 'widgets_init', 'Widget_Advanced_Categories_Init' );

function Widget_Advanced_Categories_Init() {
	register_widget( 'WP_Widget_Advanced_Categories' );
}