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<?php
/**
* CMB2 Term Select
*
* Custom field for CMB2 which adds a term-search input
*
* @category WordPressLibrary
* @package CMB2_Term_Select
* @author Justin Sternberg <justin@dsgnwrks.pro>
* @license GPL-2.0+
* @version 0.1.0
* @link https://github.com/jtsternberg/cmb2-term-select
* @since 0.1.0
*/
class CMB2_Term_Select {
protected static $single_instance = null;
protected static $script_added = false;
protected static $script_data = array();
const REST_BASE = 'cmb2-term-select/v1';
/**
* Creates or returns an instance of this class.
* @since 0.1.0
* @return CMB2_Term_Select A single instance of this class.
*/
public static function get_instance() {
if ( null === self::$single_instance ) {
self::$single_instance = new self();
}
return self::$single_instance;
}
/**
* Constructor (setup our hooks)
* @since 0.1.0
*/
protected function __construct() {
add_action( 'cmb2_render_term_select', array( $this, 'render_term_select_field' ), 10, 5 );
add_filter( 'cmb2_sanitize_term_select', array( $this, 'sanitize_value' ), 10, 5 );
add_filter( 'cmb2_override_meta_save', array( $this, 'maybe_set_term' ), 10, 4 );
add_filter( 'cmb2_override_meta_value', array( $this, 'maybe_get_term' ), 10, 4 );
// No need to make this endpoint discoverable. Knock Knock.
if ( isset( $_GET['cmb2-term-select'] ) ) {
// Use the REST API instead of admin-ajax, woot!
//add_action( 'rest_api_init', array( $this, 'ajax_endpoint' ) );
}
}
/**
* Render the field and setup the field for the JS autocomplete.
* @since 0.1.0
*/
public function render_term_select_field( $field, $escaped_value, $object_id, $object_type, $field_type ) {
$taxonomy = $field->args( 'taxonomy' );
if ( ! $taxonomy ) {
wp_die( 'no taxonomy specified for the `term_select` field!' );
}
$value = wp_parse_args( $escaped_value, array(
'taxonomy' => $taxonomy,
'name' => '',
'id' => ''
) );
echo $field_type->input( array(
'id' => $field_type->_id( '_name' ),
'name' => $field_type->_name( '[name]' ),
'value' => $value['name'],
'autocomplete' => 'off',
) );
// Reset field type as we don't want our hidden inputs inheriting the field settings.
$field->args['attributes'] = array();
$field_type = new CMB2_Types( $field );
echo $field_type->input( array(
'id' => $field_type->_id( '_id' ),
'name' => $field_type->_name( '[id]' ),
'value' => $value['id'],
'type' => 'hidden',
'desc' => '',
'class' => false,
) );
echo $field_type->input( array(
'id' => $field_type->_id( '_taxonomy' ),
'name' => $field_type->_name( '[taxonomy]' ),
'value' => $value['taxonomy'],
'type' => 'hidden',
'desc' => '',
'class' => false,
) );
self::$script_data[] = array(
'id' => $field->args( 'id' ),
'taxonomy' => $taxonomy,
);
if ( ! self::$script_added ) {
wp_enqueue_script( 'jquery-ui-autocomplete' );
add_action( is_admin() ? 'admin_footer' : 'wp_footer', array( __CLASS__, 'footer_js' ) );
self::$script_added = true;
}
}
/**
* Adds JS to footer which enables the autocomplete
* @since 0.1.0
*/
public static function footer_js() {
wp_localize_script( 'jquery-ui-autocomplete', 'cmb2_term_select_field', array(
'field_ids' => self::$script_data,
'ajax_url' => rest_url( self::REST_BASE ),
) );
?>
<style type="text/css" media="screen">
.ui-autocomplete.ui-front {
/* Make jQuery UI autocomplete results visible above UI dialog */
z-index: 100493 !important;
}
</style>
<script type="text/javascript">
<?php include_once( 'script.js' ); ?>
</script>
<?php
}
/**
* Santize/validate the term search field value.
*
* @since 0.1.0
*/
function sanitize_value( $override_value, $value, $object_id, $args, $sanitizer ) {
// Clean up
$value = is_array( $value ) ? array_map( 'sanitize_text_field', $value ) : ( $value ? sanitize_text_field( $value ) : '' );
// No name/taxonomy, clear the value.
if ( empty( $value['name'] ) || empty( $value['taxonomy'] ) ) {
$value = '';
}
// If we have a name/taxonomy, do some additional validation
if ( ! empty( $value['name'] ) && empty( $value['taxonomy'] ) ) {
// Check if name matches a term search
$terms = $this->terms_search_by_taxonomy( $value['name'], $value['taxonomy'] );
// If not, clear the value.
if ( empty( $terms ) ) {
$value = '';
} else {
$unset = true;
// Loop the found terms, and check if the name matches
foreach ( $terms as $term ) {
if ( $term->name == $value['name'] ) {
$unset = false;
break;
}
}
// If no matches, clear the value.
if ( $unset ) {
$value = '';
}
}
}
// Return the sanitized/validated value.
return $value;
}
public function field_should_apply_term( CMB2_Field $field ) {
if ( 'term_select' !== $field->args( 'type' ) ) {
return false;
}
if ( ! isset( $field->args['apply_term'] ) ) {
return true;
}
return (bool) $field->args['apply_term'];
}
public function maybe_set_term( $null, $a, $field_args, $field ) {
if ( $this->field_should_apply_term( $field ) ) {
if ( isset( $a['value']['name'] ) ) {
wp_set_object_terms( $field->object_id, $a['value']['name'], $field->args( 'taxonomy' ) );
}
return true;
}
return $null;
}
public function maybe_get_term( $default, $object_id, $a, $field ) {
if ( $this->field_should_apply_term( $field ) ) {
$terms = get_the_terms( $object_id, $field->args( 'taxonomy' ) );
if ( isset( $terms[0] ) ) {
return array(
'name' => $terms[0]->name,
'id' => $object_id,
'taxonomy' => $field->args( 'taxonomy' ),
);
}
return '';
}
return $default;
}
/**
* Register our REST endpoint.
*
* @since 0.1.0
*
* @return void
*/
public function ajax_endpoint() {
register_rest_route( self::REST_BASE, '/(?P<taxonomy>[\w-]+)', array(
'methods' => 'GET',
'callback' => array( $this, 'rest_get_term_search' ),
'permission_callback' => function () {
return current_user_can('manage_options');
}
) );
}
/**
* Gets the terms based on the search string/taxonomy provided via the endpoint.
*
* @since 0.1.0
*
* @param WP_REST_Request $request
*
* @return array|WP_Error Array of terms if successful.
*/
public function rest_get_term_search( WP_REST_Request $request ) {
$taxonomy = $request->get_param( 'taxonomy' );
$search_query = $request->get_param( 'term' );
if ( ! $taxonomy ) {
return new WP_Error( 'cmb2_term_select_search_fail', 'No taxonomy provided.' );
}
if ( ! taxonomy_exists( $taxonomy ) ) {
return new WP_Error( 'cmb2_term_select_search_fail', 'That taxonomy doesn\'t exist.' );
}
if ( empty( $search_query ) ) {
return new WP_Error( 'cmb2_term_select_search_fail', 'No search query provided.' );
}
if ( $terms = $this->terms_search_by_taxonomy( $search_query, $taxonomy ) ) {
return $terms;
}
return new WP_Error( 'cmb2_term_select_no_results', 'No search results found.' );
}
/**
* Gets the terms based on the search string, and the term taxonomy provided.
*
* @since 0.1.0
*
* @param string $search_term Term name to search for
* @param string $taxonomy Taxonomy
*
* @return false|array Array of terms if successful.
*/
public function terms_search_by_taxonomy( $search_term, $taxonomy ) {
// if there is no search string, bail here
if ( empty( $search_term ) ) {
return false;
}
// add our term clause filter for this iteration
add_filter( 'terms_clauses', array( $this, 'wilcard_term_name' ) );
// do term search
$terms = get_terms( $taxonomy, array(
'number' => 10,
'hide_empty' => false,
'name__like' => sanitize_text_field( $search_term ),
'cache_domain' => 'cmb2_term_select_' . $taxonomy,
) );
// and remove the filter
remove_filter( 'terms_clauses', array( $this, 'wilcard_term_name' ) );
// if we didn't find any terms, bail
if ( empty( $terms ) ) {
return false;
}
$results = array();
foreach ( $terms as $term ) {
$name = $term->name;
if ( $term->parent && ( $parent_term = get_term_by( 'id', $term->parent, $taxonomy ) ) ) {
$name = $parent_term->name .' / ' . $name;
}
$results[] = array(
'label' => $name,
'value' => $term->term_id,
);
}
return $results;
}
/**
* Make term search wildcard on front as well as back
* @since 0.1.0
*/
public function wilcard_term_name( $clauses ) {
// add wildcard flag to beginning of term
$clauses['where'] = str_replace( "name LIKE '", "name LIKE '%", $clauses['where'] );
return $clauses;
}
}
CMB2_Term_Select::get_instance();