sorich87/gist:717889

## gistfile1.php
<?php
/*
 * Example code showing how to hook WordPress to add several fields to the taxonomny term edit screen.
 * To-Do: Add field types other than text fields.
 *
 * Original author:
 *
 *    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.
 *
 */

class TaxonomyTermTypes {

	var $taxonomies = array();
	var $fields = array();

	function __construct( $taxonomies, $fields ) {
		$this->TaxonomyTermTypes( $taxonomies, $fields );
	}

	//This initializes the hooks to allow saving of the
	function TaxonomyTermTypes( $taxonomies, $fields ) {
		$this->taxonomies = $taxonomies;
		$this->fields = $fields;

		add_action( 'created_term', array( &$this, 'term_type_update' ), 10, 3 );
		add_action( 'edit_term', array( &$this, 'term_type_update' ), 10, 3 );

		$this->register_taxonomy( $taxonomies );
	}

	//This initializes the hooks to allow adding the dropdown to the form fields
	function register_taxonomy( $taxonomy ) {
		if ( !is_array( $taxonomy ) )
			$taxonomy = array( $taxonomy );

		foreach( $taxonomy as $tax_name ) {
			add_action( "{$tax_name}_add_form_fields", array( &$this, "add_form_fields" ) );
			add_action( "{$tax_name}_edit_form_fields", array( &$this, "edit_form_fields" ), 10, 2 );
		}
	}

	// This displays the selections. Edit it to retrieve
	function add_form_fields( $taxonomy ) {
		foreach( $this->fields as $field ) {
			$select = self::get_text_html( $field, $value = '' );
			$html =<<<HTML
<div class="form-field">
	<label for="tag-$field[id]">$field[label]</label>
	$select
</div>
HTML;
			echo $html;
		}
	}

	// This displays the selections. Edit it to retrieve your own terms however you retrieve them.
	function get_text_html( $field, $value = '' ) {
		$html =<<<HTML
<input name="tag-$field[id]" id="tag-$field[id]" type="text" value="$value" size="40" />
HTML;
		return $html;
	}

	// This a table row with the drop down for an edit screen
	function edit_form_fields($term, $taxonomy) {
		foreach( $this->fields as $field ) {
			$field_id = $field['id'];
			$value = get_option("_term_{$field_id}_{$taxonomy}_{$term->term_id}");
			$select = self::get_text_html( $field, $value );
			$html =<<<HTML
<tr class="form-field form-required">
	<th scope="row" valign="top"><label for="tag-$field[id]">$field[label]</label></th>
	<td>$select</td>
</tr>
HTML;
			echo $html;
		}
	}

	// These hooks are called after adding and editing to save $_POST['tag-term']
	function term_type_update($term_id, $tt_id, $taxonomy) {
		foreach( $this->fields as $field ) {
			$field_id = $field['id'];
			if ( isset( $_POST['tag-' . $field_id] ) ) {
				update_option( "_term_{$field_id}_{$taxonomy}_{$term_id}", $_POST['tag-' . $field_id] );
			}
		}
	}
}

//This initializes the class.
//This should be called in your own code.
$tax_fields = array(
	array(
		'id' => 'more',
		'type' => 'text',
		'label' => 'More Link'
	),
	array(
		'id' => 'keywords',
		'type' => 'text',
		'label' => 'Keywords Link'
	),
	array(
		'id' => 'programs',
		'type' => 'text',
		'label' => 'Affiliate Programs Link'
	),
);

new TaxonomyTermTypes( array( 'category' ), $tax_fields );
	<?php
	/*
	* Example code showing how to hook WordPress to add several fields to the taxonomny term edit screen.
	* To-Do: Add field types other than text fields.
	*
	* Original author:
	*
	* 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.
	*
	*/

	class TaxonomyTermTypes {

	var $taxonomies = array();
	var $fields = array();

	function __construct( $taxonomies, $fields ) {
	$this->TaxonomyTermTypes( $taxonomies, $fields );
	}

	//This initializes the hooks to allow saving of the
	function TaxonomyTermTypes( $taxonomies, $fields ) {
	$this->taxonomies = $taxonomies;
	$this->fields = $fields;

	add_action( 'created_term', array( &$this, 'term_type_update' ), 10, 3 );
	add_action( 'edit_term', array( &$this, 'term_type_update' ), 10, 3 );

	$this->register_taxonomy( $taxonomies );
	}

	//This initializes the hooks to allow adding the dropdown to the form fields
	function register_taxonomy( $taxonomy ) {
	if ( !is_array( $taxonomy ) )
	$taxonomy = array( $taxonomy );

	foreach( $taxonomy as $tax_name ) {
	add_action( "{$tax_name}_add_form_fields", array( &$this, "add_form_fields" ) );
	add_action( "{$tax_name}_edit_form_fields", array( &$this, "edit_form_fields" ), 10, 2 );
	}
	}

	// This displays the selections. Edit it to retrieve
	function add_form_fields( $taxonomy ) {
	foreach( $this->fields as $field ) {
	$select = self::get_text_html( $field, $value = '' );
	$html =<<<HTML
	<div class="form-field">
	<label for="tag-$field[id]">$field[label]</label>
	$select
	</div>
	HTML;
	echo $html;
	}
	}

	// This displays the selections. Edit it to retrieve your own terms however you retrieve them.
	function get_text_html( $field, $value = '' ) {
	$html =<<<HTML
	<input name="tag-$field[id]" id="tag-$field[id]" type="text" value="$value" size="40" />
	HTML;
	return $html;
	}

	// This a table row with the drop down for an edit screen
	function edit_form_fields($term, $taxonomy) {
	foreach( $this->fields as $field ) {
	$field_id = $field['id'];
	$value = get_option("_term_{$field_id}_{$taxonomy}_{$term->term_id}");
	$select = self::get_text_html( $field, $value );
	$html =<<<HTML
	<tr class="form-field form-required">
	<th scope="row" valign="top"><label for="tag-$field[id]">$field[label]</label></th>
	<td>$select</td>
	</tr>
	HTML;
	echo $html;
	}
	}

	// These hooks are called after adding and editing to save $_POST['tag-term']
	function term_type_update($term_id, $tt_id, $taxonomy) {
	foreach( $this->fields as $field ) {
	$field_id = $field['id'];
	if ( isset( $_POST['tag-' . $field_id] ) ) {
	update_option( "_term_{$field_id}_{$taxonomy}_{$term_id}", $_POST['tag-' . $field_id] );
	}
	}
	}
	}

	//This initializes the class.
	//This should be called in your own code.
	$tax_fields = array(
	array(
	'id' => 'more',
	'type' => 'text',
	'label' => 'More Link'
	),
	array(
	'id' => 'keywords',
	'type' => 'text',
	'label' => 'Keywords Link'
	),
	array(
	'id' => 'programs',
	'type' => 'text',
	'label' => 'Affiliate Programs Link'
	),
	);

	new TaxonomyTermTypes( array( 'category' ), $tax_fields );