et-meta-hawk.php

<?php

/**

 * Plugin name: ET Meta Hawk

 * Description: Lets site administrators soar over meta data supplied by attendees then swoop down, hawk-like, to change it. Proof of concept targeting the WooCommerce provider.

 * Version:     2016-03-21

 *

 *     Experiment in making attendee meta editable via the attendee screen.

 *     Well worth bearing in mind that:

 *

 *         - It currently won't work for RSVP or providers besides WooCommerce

 *         - For checkbox type fields, if you try adding a new value that hasn't

 *           actually been defined, it will be rejected

 *

 *                     /---\

 *                    < O   \

 *       ______________\    /______________

 *        ==============OOOO==============

 *         --------------uu--------------

 *                    _/    \_

 *

 */

​

class ET_Meta_Hawk {

	static function begin() {

		add_action( 'wp_ajax_update_attendee_meta_field', array( __CLASS__, 'update_meta' ) );

		add_action( 'admin_footer', array( __CLASS__, 'setup_meta_editing' ), 100 );

	}

​

	static function update_meta() {

		if ( ! wp_verify_nonce( @$_POST['check'], 'attendee_meta_live_edit' ) ) return;

​

		$field     = self::get_clean_field_name( @$_POST['field'] );

		$attendee  = self::get_clean_attendee_id( @$_POST['attendee'] );

		$ticket    = self::get_related_ticket_id( $attendee );

		$existing  = Tribe__Tickets_Plus__Main::instance()->meta()->get_meta_fields_by_ticket( $ticket );

		$value     = filter_var( @$_POST['value'], FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH );

		$meta_data = get_post_meta( $attendee, Tribe__Tickets_Plus__Meta::META_KEY, true );

​

		if ( ! $attendee || ! $field ) return;

​

		foreach ( $existing as $supported_field ) {

			if ( $supported_field->slug !== $field ) continue;

​

			// A field that allows multiple options to be selected?

			if ( $supported_field->type === 'checkbox' ) {

				$values = explode( ',', $value );

				$values = array_map( 'trim', $values );

​

				foreach ( $values as $value )

					$meta_data[ $field . '_' . strtolower( $value ) ] = $value;

			}

			// Normal field?

			else $meta_data[ $field ] = $value;

		}

​

		update_post_meta( $attendee, Tribe__Tickets_Plus__Meta::META_KEY, $meta_data );

	}

​

	/**

	 * Given the attendee identifier (expected to look like "123|provider_class")

	 * return the ID portion as an int.

	 *

	 * @param  string $attendee_string

	 * @return int

	 */

	static function get_clean_attendee_id( $attendee_string ) {

		$field = explode( '|', $attendee_string );

		if ( count( $field ) === 2 ) return absint( $field[0] );

		return 0;

	}

​

	/**

	 * Given the meta field identifier (actually drawn from a CSS class), return

	 * the meta field name segment only.

	 *

	 * @param  string $field_name_string

	 * @return string

	 */

	static function get_clean_field_name( $field_name_string ) {

		$field_name_prefix = 'event-tickets-meta-data_';

		$chunks = explode( ' ', $field_name_string );

​

		foreach ( $chunks as $single_chunk ) {

			if ( 0 === strpos( $single_chunk, $field_name_prefix ) )

				return substr( $single_chunk, strlen( $field_name_prefix ) );

		}

​

		return '';

	}

​

	/**

	 * Gets the ticket ID related to the specified attendee ID.

	 *

	 * Only works for WooCommerce Tickets at present. Could certainly iterate and

	 * improve so its not tied to one provider in this way.

	 *

	 * @param  int $attendee_id

	 * @return int

	 */

	static function get_related_ticket_id( $attendee_id ) {

		return absint( get_post_meta( $attendee_id, '_tribe_wooticket_product', true ) );

	}

​

	static function setup_meta_editing() {

		if ( get_current_screen()->id !== 'tribe_events_page_tickets-attendees' ) return;

		$nonce = wp_create_nonce( 'attendee_meta_live_edit' );

​

		echo '

			<script type="text/javascript">

				jQuery( document ).ready( function( $ ) {

					var $meta_rows    = $( ".wp-list-table tr.event-tickets-meta-row" );

					var $meta_fields  = $meta_rows.find( "dd" );

​

					function submit_change( event ) {

						// The submission trigger is the enter/return key

						if ( event.keyCode !== 13 ) return;

​

						var $this = $( this );

						var field = $this.parents( "dd" ).attr( "class" );

						var id    = $this.parents( "tr" ).prev( "tr" ).find( "th.check-column" ).find( "input" ).val();

						var value = $this.val();

​

						$this.prop( "readonly", true );

​

						$.post( ajaxurl, {

							"action":   "update_attendee_meta_field",

							"check":    "' . $nonce . '",

							"attendee": id,

							"field":    field,

							"value":    value

						}, function() {

							$this.parents( "dd" ).html( value );

						} );

​

						event.preventDefault();

						return false;

					}

​

					$meta_fields.click( function() {

						var $this = $( this );

​

						// Already editable? Do nothing more

						if ( $this.find( "input" ).length ) return;

​

						$this.html( "<input type=\'text\' value=\'" + $this.html() + "\'>" );

						var $field = $this.find( "input" );

						$field.focus();

​

						$field.keypress( submit_change );

					} );

				} );

			</script>

		';

	}

}

​

ET_Meta_Hawk::begin();