joshuadavidnelson/custom-taxonomy-fields.php

## custom-taxonomy-fields.php
<?php
/*
 * Example code showing how to hook WordPress to add fields to the taxonomny term edit screen.
 *
 * This example is meant to show how,  not to be a drop in example.
 *
 * This example was written in response to this question:
 *
 *    http://lists.automattic.com/pipermail/wp-hackers/2010-August/033671.html
 *
 * By:
 *
 *    Mike Schinkel ( http://mikeschinkel.com/custom-wordpress-plugins/ )
 *
 * NOTE:
 *
 *    This could easily become a plugin if it were fleshed out.
 *    A class with static methods was used to minimize the variables & functions added to the global namespace.
 *    wp_options was uses with one option be tax/term instead of via a serialize array because it aids in retrival
 *    if there get to be a large number of tax/terms types. A taxonomy/term meta would be the prefered but WordPress
 *    does not have one.
 *
 * This example is licensed GPLv2.
 *
 */

// These are helper functions you can use elsewhere to access this info
function get_taxonomy_term_type( $taxonomy, $term_id ) {
	return get_option( "_term_type_{$taxonomy}_{$term->term_id}" );
}
function update_taxonomy_term_type( $taxonomy, $term_id, $value ) {
	update_option( "_term_type_{$taxonomy}_{$term_id}", $value );
}

//This initializes the class.
Rover_Taxonomy_Term_Types::on_load();

//This should be called in your own code. This example uses two taxonomies: 'region' & 'opportunity'
Rover_Taxonomy_Term_Types::register_taxonomy( array( 'category' ) );

class Rover_Taxonomy_Term_Types {

	//This initializes the hooks to allow saving of the
	static function on_load(  ) {
		add_action( 'created_term', array( __CLASS__, 'term_type_update' ), 10, 3 );
		add_action( 'edit_term', array( __CLASS__, 'term_type_update' ), 10, 3 );
	}

	//This initializes the hooks to allow adding the dropdown to the form fields
	static function register_taxonomy( $taxonomy ) {
		if ( !is_array( $taxonomy ) )
			$taxonomy = array( $taxonomy );
		foreach( $taxonomy as $tax_name ) {
			add_action( "{$tax_name}_add_form_fields", array( __CLASS__, "add_form_fields" ) );
			add_action( "{$tax_name}_edit_form_fields", array( __CLASS__, "edit_form_fields" ), 10, 2 );
		}
	}

	// This displays the selections. Edit it to retrieve
	static function add_form_fields( $taxonomy ) {
		echo "Type " . self::get_select_html( 'text' );
	}

	// This displays the selections. Edit it to retrieve your own terms however you retrieve them.
	static function get_select_html( $selected ) {
		$selected_attr = array( 'text'=>'', 'user'=>'', 'date'=>'', 'etc'=>'' );
		$selected_attr[$selected] = ' selected="selected"';
		$html =<<<HTML
<select id="tag-type" name="tag-type">
	<option value="text"{$selected_attr['text']}>Text</option>
	<option value="user"{$selected_attr['user']}>User</option>
	<option value="date"{$selected_attr['date']}>Date</option>
	<option value="etc" {$selected_attr['etc']}>Etc.</option>
</select>
HTML;
		return $html;
	}
		// This a table row with the drop down for an edit screen
		static function edit_form_fields( $term,  $taxonomy ) {
		$selected = get_option( "_term_type_{$taxonomy}_{$term->term_id}" );
		$select = self::get_select_html( $selected );
		$html =<<<HTML
<tr class="form-field form-required">
	<th scope="row" valign="top"><label for="tag-type">Slider</label></th>
	<td>$select</td>
</tr>
HTML;
		echo $html;
	}
	// These hooks are called after adding and editing to save $_POST['tag-term']
	static function term_type_update( $term_id,  $tt_id,  $taxonomy ) {
		if ( isset( $_POST['tag-type'] ) ) {
			update_taxonomy_term_type( $taxonomy, $term_id, $_POST['tag-type'] );
		}
	}
}
	<?php
	/*
	* Example code showing how to hook WordPress to add fields to the taxonomny term edit screen.
	*
	* This example is meant to show how, not to be a drop in example.
	*
	* This example was written in response to this question:
	*
	* http://lists.automattic.com/pipermail/wp-hackers/2010-August/033671.html
	*
	* By:
	*
	* Mike Schinkel ( http://mikeschinkel.com/custom-wordpress-plugins/ )
	*
	* NOTE:
	*
	* This could easily become a plugin if it were fleshed out.
	* A class with static methods was used to minimize the variables & functions added to the global namespace.
	* wp_options was uses with one option be tax/term instead of via a serialize array because it aids in retrival
	* if there get to be a large number of tax/terms types. A taxonomy/term meta would be the prefered but WordPress
	* does not have one.
	*
	* This example is licensed GPLv2.
	*
	*/

	// These are helper functions you can use elsewhere to access this info
	function get_taxonomy_term_type( $taxonomy, $term_id ) {
	return get_option( "_term_type_{$taxonomy}_{$term->term_id}" );
	}
	function update_taxonomy_term_type( $taxonomy, $term_id, $value ) {
	update_option( "_term_type_{$taxonomy}_{$term_id}", $value );
	}

	//This initializes the class.
	Rover_Taxonomy_Term_Types::on_load();

	//This should be called in your own code. This example uses two taxonomies: 'region' & 'opportunity'
	Rover_Taxonomy_Term_Types::register_taxonomy( array( 'category' ) );

	class Rover_Taxonomy_Term_Types {

	//This initializes the hooks to allow saving of the
	static function on_load( ) {
	add_action( 'created_term', array( __CLASS__, 'term_type_update' ), 10, 3 );
	add_action( 'edit_term', array( __CLASS__, 'term_type_update' ), 10, 3 );
	}

	//This initializes the hooks to allow adding the dropdown to the form fields
	static function register_taxonomy( $taxonomy ) {
	if ( !is_array( $taxonomy ) )
	$taxonomy = array( $taxonomy );
	foreach( $taxonomy as $tax_name ) {
	add_action( "{$tax_name}_add_form_fields", array( __CLASS__, "add_form_fields" ) );
	add_action( "{$tax_name}_edit_form_fields", array( __CLASS__, "edit_form_fields" ), 10, 2 );
	}
	}

	// This displays the selections. Edit it to retrieve
	static function add_form_fields( $taxonomy ) {
	echo "Type " . self::get_select_html( 'text' );
	}

	// This displays the selections. Edit it to retrieve your own terms however you retrieve them.
	static function get_select_html( $selected ) {
	$selected_attr = array( 'text'=>'', 'user'=>'', 'date'=>'', 'etc'=>'' );
	$selected_attr[$selected] = ' selected="selected"';
	$html =<<<HTML
	<select id="tag-type" name="tag-type">
	<option value="text"{$selected_attr['text']}>Text</option>
	<option value="user"{$selected_attr['user']}>User</option>
	<option value="date"{$selected_attr['date']}>Date</option>
	<option value="etc" {$selected_attr['etc']}>Etc.</option>
	</select>
	HTML;
	return $html;
	}
	// This a table row with the drop down for an edit screen
	static function edit_form_fields( $term, $taxonomy ) {
	$selected = get_option( "_term_type_{$taxonomy}_{$term->term_id}" );
	$select = self::get_select_html( $selected );
	$html =<<<HTML
	<tr class="form-field form-required">
	<th scope="row" valign="top"><label for="tag-type">Slider</label></th>
	<td>$select</td>
	</tr>
	HTML;
	echo $html;
	}
	// These hooks are called after adding and editing to save $_POST['tag-term']
	static function term_type_update( $term_id, $tt_id, $taxonomy ) {
	if ( isset( $_POST['tag-type'] ) ) {
	update_taxonomy_term_type( $taxonomy, $term_id, $_POST['tag-type'] );
	}
	}
	}