CMB2 Documentation
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Packages

  • CMB2
  • Demo
    • CMB2
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    • CMB2

Classes

  • CMB2
  • CMB2_Ajax
  • CMB2_Base
  • CMB2_Bootstrap_2101
  • CMB2_Boxes
  • CMB2_Display_Checkbox
  • CMB2_Display_Colorpicker
  • CMB2_Display_File
  • CMB2_Display_File_List
  • CMB2_Display_Multicheck
  • CMB2_Display_oEmbed
  • CMB2_Display_Select
  • CMB2_Display_Taxonomy_Multicheck
  • CMB2_Display_Taxonomy_Radio
  • CMB2_Display_Text_Date
  • CMB2_Display_Text_Date_Timezone
  • CMB2_Display_Text_Money
  • CMB2_Display_Text_Time
  • CMB2_Display_Text_Url
  • CMB2_Display_Textarea
  • CMB2_Display_Textarea_Code
  • CMB2_Field
  • CMB2_Field_Display
  • CMB2_Hookup
  • CMB2_Hookup_Base
  • CMB2_Integration_Box
  • CMB2_JS
  • CMB2_Option
  • CMB2_Options
  • CMB2_Options_Hookup
  • CMB2_REST
  • CMB2_REST_Controller
  • CMB2_REST_Controller_Boxes
  • CMB2_REST_Controller_Fields
  • CMB2_Sanitize
  • CMB2_Show_Filters
  • CMB2_Type_Base
  • CMB2_Type_Checkbox
  • CMB2_Type_Colorpicker
  • CMB2_Type_Counter_Base
  • CMB2_Type_File
  • CMB2_Type_File_Base
  • CMB2_Type_File_List
  • CMB2_Type_Multi_Base
  • CMB2_Type_Multicheck
  • CMB2_Type_Oembed
  • CMB2_Type_Picker_Base
  • CMB2_Type_Radio
  • CMB2_Type_Select
  • CMB2_Type_Select_Timezone
  • CMB2_Type_Taxonomy_Base
  • CMB2_Type_Taxonomy_Multicheck
  • CMB2_Type_Taxonomy_Multicheck_Hierarchical
  • CMB2_Type_Taxonomy_Radio
  • CMB2_Type_Taxonomy_Radio_Hierarchical
  • CMB2_Type_Taxonomy_Select
  • CMB2_Type_Taxonomy_Select_Hierarchical
  • CMB2_Type_Text
  • CMB2_Type_Text_Date
  • CMB2_Type_Text_Datetime_Timestamp
  • CMB2_Type_Text_Datetime_Timestamp_Timezone
  • CMB2_Type_Text_Time
  • CMB2_Type_Textarea
  • CMB2_Type_Textarea_Code
  • CMB2_Type_Title
  • CMB2_Type_Wysiwyg
  • CMB2_Types
  • CMB2_Utils

Hooks

  • Hook Reference
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<?php
/**
 * CMB2 - The core metabox object
 *
 * @category  WordPress_Plugin
 * @package   CMB2
 * @author    CMB2 team
 * @license   GPL-2.0+
 * @link      https://cmb2.io
 *
 * @property-read string $cmb_id
 * @property-read array $meta_box
 * @property-read array $updated
 * @property-read bool  $has_columns
 * @property-read array $tax_metaboxes_to_remove
 */

/**
 * The main CMB2 object for storing box data/properties.
 */
class CMB2 extends CMB2_Base {

    /**
     * The object properties name.
     *
     * @var   string
     * @since 2.2.3
     */
    protected $properties_name = 'meta_box';

    /**
     * Metabox Config array
     *
     * @var   array
     * @since 0.9.0
     */
    protected $meta_box = array();

    /**
     * Type of object registered for metabox. (e.g., post, user, or comment)
     *
     * @var   string
     * @since 1.0.0
     */
    protected $mb_object_type = null;

    /**
     * List of fields that are changed/updated on save
     *
     * @var   array
     * @since 1.1.0
     */
    protected $updated = array();

    /**
     * Metabox Defaults
     *
     * @var   array
     * @since 1.0.1
     */
    protected $mb_defaults = array(
        'id'                      => '',
        'title'                   => '',
        // Post type slug, or 'user', 'term', 'comment', or 'options-page'.
        'object_types'            => array(),

        /**
         * The context within the screen where the boxes should display. Available contexts vary
         * from screen to screen. Post edit screen contexts include 'normal', 'side', and 'advanced'.
         *
         * For placement in locations outside of a metabox, other options include:
         * 'form_top', 'before_permalink', 'after_title', 'after_editor'
         *
         * Comments screen contexts include 'normal' and 'side'. Default is 'normal'.
         */
        'context'                 => 'normal',
        'priority'                => 'high', // Or 10 for options pages.
        'show_names'              => true, // Show field names on the left.
        'show_on_cb'              => null, // Callback to determine if metabox should display.
        'show_on'                 => array(), // Post IDs or page templates to display this metabox. overrides 'show_on_cb'.
        'cmb_styles'              => true, // Include CMB2 stylesheet.
        'enqueue_js'              => true, // Include CMB2 JS.
        'fields'                  => array(),

        /**
         * Handles hooking CMB2 forms/metaboxes into the post/attachement/user/options-page screens
         * and handles hooking in and saving those fields.
         */
        'hookup'                  => true,
        'save_fields'             => true, // Will not save during hookup if false.
        'closed'                  => false, // Default metabox to being closed.
        'taxonomies'              => array(),
        'new_user_section'        => 'add-new-user', // or 'add-existing-user'.
        'new_term_section'        => true,
        'show_in_rest'            => false,
        'classes'                 => null, // Optionally add classes to the CMB2 wrapper.
        'classes_cb'              => '', // Optionally add classes to the CMB2 wrapper (via a callback).

        /*
         * The following parameter is for post alternate-context metaboxes only.
         *
         * To output the fields 'naked' (without a postbox wrapper/style), then
         * add a `'remove_box_wrap' => true` to your metabox registration array.
         */
        'remove_box_wrap'         => false,

        /*
         * The following parameter is any additional arguments passed as $callback_args
         * to add_meta_box, if/when applicable.
         *
         * CMB2 does not use these arguments in the add_meta_box callback, however, these args
         * are parsed for certain special properties, like determining Gutenberg/block-editor
         * compatibility.
         *
         * Examples:
         *
         * - Make sure default editor is used as metabox is not compatible with block editor
         *      [ '__block_editor_compatible_meta_box' => false/true ]
         *
         * - Or declare this box exists for backwards compatibility
         *      [ '__back_compat_meta_box' => false ]
         *
         * More: https://wordpress.org/gutenberg/handbook/extensibility/meta-box/
         */
        'mb_callback_args'        => null,

        /*
         * The following parameters are for options-page metaboxes,
         * and several are passed along to add_menu_page()/add_submenu_page()
         */

        // 'menu_title'           => null, // Falls back to 'title' (above). Do not define here so we can set a fallback.
        'message_cb'              => '', // Optionally define the options-save message (via a callback).
        'option_key'              => '', // The actual option key and admin menu page slug.
        'parent_slug'             => '', // Used as first param in add_submenu_page().
        'capability'              => 'manage_options', // Cap required to view options-page.
        'icon_url'                => '', // Menu icon. Only applicable if 'parent_slug' is left empty.
        'position'                => null, // Menu position. Only applicable if 'parent_slug' is left empty.

        'admin_menu_hook'         => 'admin_menu', // Alternately 'network_admin_menu' to add network-level options page.
        'display_cb'              => false, // Override the options-page form output (CMB2_Hookup::options_page_output()).
        'save_button'             => '', // The text for the options-page save button. Defaults to 'Save'.
        'disable_settings_errors' => false, // On settings pages (not options-general.php sub-pages), allows disabling.
        'tab_group'               => '', // Tab-group identifier, enables options page tab navigation.
        // 'tab_title'            => null, // Falls back to 'title' (above). Do not define here so we can set a fallback.
        // 'autoload'             => true, // Defaults to true, the options-page option will be autloaded.
    );

    /**
     * Metabox field objects
     *
     * @var   array
     * @since 2.0.3
     */
    protected $fields = array();

    /**
     * An array of hidden fields to output at the end of the form
     *
     * @var   array
     * @since 2.0.0
     */
    protected $hidden_fields = array();

    /**
     * Array of key => value data for saving. Likely $_POST data.
     *
     * @var   string
     * @since 2.0.0
     */
    protected $generated_nonce = '';

    /**
     * Whether there are fields to be shown in columns. Set in CMB2::add_field().
     *
     * @var   bool
     * @since 2.2.2
     */
    protected $has_columns = false;

    /**
     * If taxonomy field is requesting to remove_default, we store the taxonomy here.
     *
     * @var   array
     * @since 2.2.3
     */
    protected $tax_metaboxes_to_remove = array();

    /**
     * Get started
     *
     * @since 0.4.0
     * @param array   $config    Metabox config array.
     * @param integer $object_id Optional object id.
     */
    public function __construct( $config, $object_id = 0 ) {

        if ( empty( $config['id'] ) ) {
            wp_die( esc_html__( 'Metabox configuration is required to have an ID parameter.', 'cmb2' ) );
        }

        $this->cmb_id = $config['id'];
        $this->meta_box = wp_parse_args( $config, $this->mb_defaults );
        $this->meta_box['fields'] = array();

        // Ensures object_types is an array.
        $this->set_prop( 'object_types', $this->box_types() );
        $this->object_id( $object_id );

        if ( $this->is_options_page_mb() ) {

            // Check initial priority.
            if ( empty( $config['priority'] ) ) {

                // If not explicitly defined, Reset the priority to 10
                // Fixes https://github.com/CMB2/CMB2/issues/1410.
                $this->meta_box['priority'] = 10;
            }

            $this->init_options_mb();
        }

        $this->mb_object_type();

        if ( ! empty( $config['fields'] ) && is_array( $config['fields'] ) ) {
            $this->add_fields( $config['fields'] );
        }

        CMB2_Boxes::add( $this );

        /**
         * Hook during initiation of CMB2 object
         *
         * The dynamic portion of the hook name, $this->cmb_id, is this meta_box id.
         *
         * @param array $cmb This CMB2 object
         */
        do_action( "cmb2_init_{$this->cmb_id}", $this );

        // Hook in the hookup... how meta.
        add_action( "cmb2_init_hookup_{$this->cmb_id}", array( 'CMB2_Hookup', 'maybe_init_and_hookup' ) );

        // Hook in the rest api functionality.
        add_action( "cmb2_init_hookup_{$this->cmb_id}", array( 'CMB2_REST', 'maybe_init_and_hookup' ) );
    }

    /**
     * Loops through and displays fields
     *
     * @since 1.0.0
     * @param int    $object_id   Object ID.
     * @param string $object_type Type of object being saved. (e.g., post, user, or comment).
     *
     * @return CMB2
     */
    public function show_form( $object_id = 0, $object_type = '' ) {
        $this->render_form_open( $object_id, $object_type );

        foreach ( $this->prop( 'fields' ) as $field_args ) {
            $this->render_field( $field_args );
        }

        return $this->render_form_close( $object_id, $object_type );
    }

    /**
     * Outputs the opening form markup and runs corresponding hooks:
     * 'cmb2_before_form' and "cmb2_before_{$object_type}_form_{$this->cmb_id}"
     *
     * @since  2.2.0
     * @param  integer $object_id   Object ID.
     * @param  string  $object_type Object type.
     *
     * @return CMB2
     */
    public function render_form_open( $object_id = 0, $object_type = '' ) {
        $object_type = $this->object_type( $object_type );
        $object_id = $this->object_id( $object_id );

        echo "\n<!-- Begin CMB2 Fields -->\n";

        $this->nonce_field();

        /**
         * Hook before form table begins
         *
         * @param array  $cmb_id      The current box ID.
         * @param int    $object_id   The ID of the current object.
         * @param string $object_type The type of object you are working with.
         *                            Usually `post` (this applies to all post-types).
         *                            Could also be `comment`, `user` or `options-page`.
         * @param array  $cmb         This CMB2 object.
         */
        do_action( 'cmb2_before_form', $this->cmb_id, $object_id, $object_type, $this );

        /**
         * Hook before form table begins
         *
         * The first dynamic portion of the hook name, $object_type, is the type of object
         * you are working with. Usually `post` (this applies to all post-types).
         * Could also be `comment`, `user` or `options-page`.
         *
         * The second dynamic portion of the hook name, $this->cmb_id, is the meta_box id.
         *
         * @param array  $cmb_id      The current box ID
         * @param int    $object_id   The ID of the current object
         * @param array  $cmb         This CMB2 object
         */
        do_action( "cmb2_before_{$object_type}_form_{$this->cmb_id}", $object_id, $this );

        echo '<div class="', esc_attr( $this->box_classes() ), '"><div id="cmb2-metabox-', sanitize_html_class( $this->cmb_id ), '" class="cmb2-metabox cmb-field-list">';

        return $this;
    }

    /**
     * Defines the classes for the CMB2 form/wrap.
     *
     * @since  2.0.0
     * @return string Space concatenated list of classes
     */
    public function box_classes() {

        $classes = array( 'cmb2-wrap', 'form-table' );

        // Use the callback to fetch classes.
        if ( $added_classes = $this->get_param_callback_result( 'classes_cb' ) ) {
            $added_classes = is_array( $added_classes ) ? $added_classes : array( $added_classes );
            $classes = array_merge( $classes, $added_classes );
        }

        if ( $added_classes = $this->prop( 'classes' ) ) {
            $added_classes = is_array( $added_classes ) ? $added_classes : array( $added_classes );
            $classes = array_merge( $classes, $added_classes );
        }

        /**
         * Add our context classes for non-standard metaboxes.
         *
         * @since 2.2.4
         */
        if ( $this->is_alternate_context_box() ) {
            $context = array();

            // Include custom class if requesting no title.
            if ( ! $this->prop( 'title' ) && ! $this->prop( 'remove_box_wrap' ) ) {
                $context[] = 'cmb2-context-wrap-no-title';
            }

            // Include a generic context wrapper.
            $context[] = 'cmb2-context-wrap';

            // Include a context-type based context wrapper.
            $context[] = 'cmb2-context-wrap-' . $this->prop( 'context' );

            // Include an ID based context wrapper as well.
            $context[] = 'cmb2-context-wrap-' . $this->prop( 'id' );

            // And merge all the classes back into the array.
            $classes = array_merge( $classes, $context );
        }

        /**
         * Globally filter box wrap classes
         *
         * @since 2.2.2
         *
         * @param string $classes Array of classes for the cmb2-wrap.
         * @param CMB2   $cmb     This CMB2 object.
         */
        $classes = apply_filters( 'cmb2_wrap_classes', $classes, $this );

        $split = array();
        foreach ( array_filter( $classes ) as $class ) {
            foreach ( explode( ' ', $class ) as $_class ) {
                // Clean up & sanitize.
                $split[] = sanitize_html_class( strip_tags( $_class ) );
            }
        }
        $classes = $split;

        // Remove any duplicates.
        $classes = array_unique( $classes );

        // Make it a string.
        return implode( ' ', $classes );
    }

    /**
     * Outputs the closing form markup and runs corresponding hooks:
     * 'cmb2_after_form' and "cmb2_after_{$object_type}_form_{$this->cmb_id}"
     *
     * @since  2.2.0
     * @param  integer $object_id   Object ID.
     * @param  string  $object_type Object type.
     *
     * @return CMB2
     */
    public function render_form_close( $object_id = 0, $object_type = '' ) {
        $object_type = $this->object_type( $object_type );
        $object_id = $this->object_id( $object_id );

        echo '</div></div>';

        $this->render_hidden_fields();

        /**
         * Hook after form form has been rendered
         *
         * The dynamic portion of the hook name, $this->cmb_id, is the meta_box id.
         *
         * The first dynamic portion of the hook name, $object_type, is the type of object
         * you are working with. Usually `post` (this applies to all post-types).
         * Could also be `comment`, `user` or `options-page`.
         *
         * @param int    $object_id   The ID of the current object
         * @param array  $cmb         This CMB2 object
         */
        do_action( "cmb2_after_{$object_type}_form_{$this->cmb_id}", $object_id, $this );

        /**
         * Hook after form form has been rendered
         *
         * @param array  $cmb_id      The current box ID.
         * @param int    $object_id   The ID of the current object.
         * @param string $object_type The type of object you are working with.
         *                            Usually `post` (this applies to all post-types).
         *                            Could also be `comment`, `user` or `options-page`.
         * @param array  $cmb         This CMB2 object.
         */
        do_action( 'cmb2_after_form', $this->cmb_id, $object_id, $object_type, $this );

        echo "\n<!-- End CMB2 Fields -->\n";

        return $this;
    }

    /**
     * Renders a field based on the field type
     *
     * @since  2.2.0
     * @param  array $field_args A field configuration array.
     * @return mixed CMB2_Field object if successful.
     */
    public function render_field( $field_args ) {
        $field_args['context'] = $this->prop( 'context' );

        if ( 'group' === $field_args['type'] ) {

            if ( ! isset( $field_args['show_names'] ) ) {
                $field_args['show_names'] = $this->prop( 'show_names' );
            }
            $field = $this->render_group( $field_args );

        } elseif ( 'hidden' === $field_args['type'] && $this->get_field( $field_args )->should_show() ) {
            // Save rendering for after the metabox.
            $field = $this->add_hidden_field( $field_args );

        } else {

            $field_args['show_names'] = $this->prop( 'show_names' );

            // Render default fields.
            $field = $this->get_field( $field_args )->render_field();
        }

        return $field;
    }

    /**
     * Render a group of fields.
     *
     * @param array|CMB2_Field $args Array of field arguments for a group field parent or the group parent field.
     * @return CMB2_Field|null Group field object.
     */
    public function render_group( $args ) {
        $field_group = false;

        if ( $args instanceof CMB2_Field ) {
            $field_group = 'group' === $args->type() ? $args : false;
        } elseif ( isset( $args['id'], $args['fields'] ) && is_array( $args['fields'] ) ) {
            $field_group = $this->get_field( $args );
        }

        if ( ! $field_group ) {
            return;
        }

        $field_group->render_context = 'edit';
        $field_group->peform_param_callback( 'render_row_cb' );

        return $field_group;
    }

    /**
     * The default callback to render a group of fields.
     *
     * @since  2.2.6
     *
     * @param  array      $field_args  Array of field arguments for the group field parent.
     * @param  CMB2_Field $field_group The CMB2_Field group object.
     *
     * @return CMB2_Field|null Group field object.
     */
    public function render_group_callback( $field_args, $field_group ) {

        // If field is requesting to be conditionally shown.
        if ( ! $field_group || ! $field_group->should_show() ) {
            return;
        }

        $field_group->index = 0;

        $field_group->peform_param_callback( 'before_group' );

        $desc      = $field_group->args( 'description' );
        $label     = $field_group->args( 'name' );
        $group_val = (array) $field_group->value();

        echo '<div class="cmb-row cmb-repeat-group-wrap ', esc_attr( $field_group->row_classes() ), '" data-fieldtype="group"><div class="cmb-td"><div data-groupid="', esc_attr( $field_group->id() ), '" id="', esc_attr( $field_group->id() ), '_repeat" ', $this->group_wrap_attributes( $field_group ), '>';

        if ( $desc || $label ) {
            $class = $desc ? ' cmb-group-description' : '';
            echo '<div class="cmb-row', $class, '"><div class="cmb-th">';
            if ( $label ) {
                echo '<h2 class="cmb-group-name">', $label, '</h2>';
            }
            if ( $desc ) {
                echo '<p class="cmb2-metabox-description">', $desc, '</p>';
            }
            echo '</div></div>';
        }

        if ( ! empty( $group_val ) ) {
            foreach ( $group_val as $group_key => $field_id ) {
                $this->render_group_row( $field_group );
                $field_group->index++;
            }
        } else {
            $this->render_group_row( $field_group );
        }

        if ( $field_group->args( 'repeatable' ) ) {
            echo '<div class="cmb-row"><div class="cmb-td"><p class="cmb-add-row"><button type="button" data-selector="', esc_attr( $field_group->id() ), '_repeat" data-grouptitle="', esc_attr( $field_group->options( 'group_title' ) ), '" class="cmb-add-group-row button-secondary">', $field_group->options( 'add_button' ), '</button></p></div></div>';
        }

        echo '</div></div></div>';

        $field_group->peform_param_callback( 'after_group' );

        return $field_group;
    }

    /**
     * Get the group wrap attributes, which are passed through a filter.
     *
     * @since  2.2.3
     * @param  CMB2_Field $field_group The group CMB2_Field object.
     * @return string                  The attributes string.
     */
    public function group_wrap_attributes( $field_group ) {
        $classes = 'cmb-nested cmb-field-list cmb-repeatable-group';
        $classes .= $field_group->options( 'sortable' ) ? ' sortable' : ' non-sortable';
        $classes .= $field_group->args( 'repeatable' ) ? ' repeatable' : ' non-repeatable';

        $group_wrap_attributes = array(
            'class' => $classes,
            'style' => 'width:100%;',
        );

        /**
         * Allow for adding additional HTML attributes to a group wrapper.
         *
         * The attributes will be an array of key => value pairs for each attribute.
         *
         * @since 2.2.2
         *
         * @param string     $group_wrap_attributes Current attributes array.
         * @param CMB2_Field $field_group           The group CMB2_Field object.
         */
        $group_wrap_attributes = apply_filters( 'cmb2_group_wrap_attributes', $group_wrap_attributes, $field_group );

        $atts = array();
        foreach ( $group_wrap_attributes as $att => $att_value ) {
            if ( ! CMB2_Utils::is_data_attribute( $att ) ) {
                $att_value = htmlspecialchars( $att_value );
            }

            $atts[ sanitize_html_class( $att ) ] = sanitize_text_field( $att_value );
        }

        return CMB2_Utils::concat_attrs( $atts );
    }

    /**
     * Render a repeatable group row
     *
     * @since  1.0.2
     * @param  CMB2_Field $field_group     CMB2_Field group field object.
     *
     * @return CMB2
     */
    public function render_group_row( $field_group ) {

        $field_group->peform_param_callback( 'before_group_row' );
        $closed_class     = $field_group->options( 'closed' ) ? ' closed' : '';
        $confirm_deletion = $field_group->options( 'remove_confirm' );
        $confirm_deletion = ! empty( $confirm_deletion ) ? $confirm_deletion : '';

        echo '
        <div id="cmb-group-', $field_group->id(), '-', $field_group->index, '" class="postbox cmb-row cmb-repeatable-grouping', $closed_class, '" data-iterator="', $field_group->index, '">';

        if ( $field_group->args( 'repeatable' ) ) {
            echo '<button type="button" data-selector="', $field_group->id(), '_repeat" data-confirm="', esc_attr( $confirm_deletion ), '" class="dashicons-before dashicons-no-alt cmb-remove-group-row" title="', esc_attr( $field_group->options( 'remove_button' ) ), '"></button>';
        }

            echo '
            <div class="cmbhandle" title="' , esc_attr__( 'Click to toggle', 'cmb2' ), '"><br></div>
            <h3 class="cmb-group-title cmbhandle-title"><span>', $field_group->replace_hash( $field_group->options( 'group_title' ) ), '</span></h3>

            <div class="inside cmb-td cmb-nested cmb-field-list">';
                // Loop and render repeatable group fields.
        foreach ( array_values( $field_group->args( 'fields' ) ) as $field_args ) {
            if ( 'hidden' === $field_args['type'] ) {

                // Save rendering for after the metabox.
                $this->add_hidden_field( $field_args, $field_group );

            } else {

                $field_args['show_names'] = $field_group->args( 'show_names' );
                $field_args['context']    = $field_group->args( 'context' );

                $this->get_field( $field_args, $field_group )->render_field();
            }
        }

        if ( $field_group->args( 'repeatable' ) ) {
            echo '
                    <div class="cmb-row cmb-remove-field-row">
                        <div class="cmb-remove-row">
                            <button type="button" data-selector="', $field_group->id(), '_repeat" data-confirm="', esc_attr( $confirm_deletion ), '" class="cmb-remove-group-row cmb-remove-group-row-button alignright button-secondary">', $field_group->options( 'remove_button' ), '</button>
                        </div>
                    </div>
                    ';
        }
            echo '
            </div>
        </div>
        ';

        $field_group->peform_param_callback( 'after_group_row' );

        return $this;
    }

    /**
     * Add a hidden field to the list of hidden fields to be rendered later.
     *
     * @since 2.0.0
     *
     * @param array           $field_args  Array of field arguments to be passed to CMB2_Field.
     * @param CMB2_Field|null $field_group CMB2_Field group field object.
     * @return CMB2_Field
     */
    public function add_hidden_field( $field_args, $field_group = null ) {
        if ( isset( $field_args['field_args'] ) ) {
            // For back-compatibility.
            $field = new CMB2_Field( $field_args );
        } else {
            $field = $this->get_new_field( $field_args, $field_group );
        }

        $types = new CMB2_Types( $field );

        if ( $field_group ) {
            $types->iterator = $field_group->index;
        }

        $this->hidden_fields[] = $types;

        return $field;
    }

    /**
     * Loop through and output hidden fields
     *
     * @since  2.0.0
     *
     * @return CMB2
     */
    public function render_hidden_fields() {
        if ( ! empty( $this->hidden_fields ) ) {
            foreach ( $this->hidden_fields as $hidden ) {
                $hidden->render();
            }
        }

        return $this;
    }

    /**
     * Returns array of sanitized field values (without saving them)
     *
     * @since  2.0.3
     * @param  array $data_to_sanitize Array of field_id => value data for sanitizing (likely $_POST data).
     * @return mixed
     */
    public function get_sanitized_values( array $data_to_sanitize ) {
        $this->data_to_save = $data_to_sanitize;
        $stored_id          = $this->object_id();

        // We do this So CMB will sanitize our data for us, but not save it.
        $this->object_id( '_' );

        // Ensure temp. data store is empty.
        cmb2_options( 0 )->set();

        // We want to get any taxonomy values back.
        add_filter( "cmb2_return_taxonomy_values_{$this->cmb_id}", '__return_true' );

        // Process/save fields.
        $this->process_fields();

        // Put things back the way they were.
        remove_filter( "cmb2_return_taxonomy_values_{$this->cmb_id}", '__return_true' );

        // Get data from temp. data store.
        $sanitized_values = cmb2_options( 0 )->get_options();

        // Empty out temp. data store again.
        cmb2_options( 0 )->set();

        // Reset the object id.
        $this->object_id( $stored_id );

        return $sanitized_values;
    }

    /**
     * Loops through and saves field data
     *
     * @since  1.0.0
     * @param  int    $object_id    Object ID.
     * @param  string $object_type  Type of object being saved. (e.g., post, user, or comment).
     * @param  array  $data_to_save Array of key => value data for saving. Likely $_POST data.
     *
     * @return CMB2
     */
    public function save_fields( $object_id = 0, $object_type = '', $data_to_save = array() ) {

        // Fall-back to $_POST data.
        $this->data_to_save = ! empty( $data_to_save ) ? $data_to_save : $_POST;
        $object_id = $this->object_id( $object_id );
        $object_type = $this->object_type( $object_type );

        $this->process_fields();

        // If options page, save the updated options.
        if ( 'options-page' === $object_type ) {
            cmb2_options( $object_id )->set();
        }

        return $this->after_save();
    }

    /**
     * Process and save form fields
     *
     * @since  2.0.0
     *
     * @return CMB2
     */
    public function process_fields() {

        $this->pre_process();

        // Remove the show_on properties so saving works.
        $this->prop( 'show_on', array() );

        // save field ids of those that are updated.
        $this->updated = array();

        foreach ( $this->prop( 'fields' ) as $field_args ) {
            $this->process_field( $field_args );
        }

        return $this;
    }

    /**
     * Process and save a field
     *
     * @since  2.0.0
     * @param  array $field_args Array of field arguments.
     *
     * @return CMB2
     */
    public function process_field( $field_args ) {

        switch ( $field_args['type'] ) {

            case 'group':
                if ( $this->save_group( $field_args ) ) {
                    $this->updated[] = $field_args['id'];
                }

                break;

            case 'title':
                // Don't process title fields.
                break;

            default:
                $field = $this->get_new_field( $field_args );

                if ( $field->save_field_from_data( $this->data_to_save ) ) {
                    $this->updated[] = $field->id();
                }

                break;
        }

        return $this;
    }

    /**
     * Fires the "cmb2_{$object_type}_process_fields_{$cmb_id}" action hook.
     *
     * @since 2.2.2
     *
     * @return CMB2
     */
    public function pre_process() {
        $object_type = $this->object_type();

        /**
         * Fires before fields have been processed/saved.
         *
         * The dynamic portion of the hook name, $object_type, refers to the
         * metabox/form's object type
         *    Usually `post` (this applies to all post-types).
         *    Could also be `comment`, `user` or `options-page`.
         *
         * The dynamic portion of the hook name, $this->cmb_id, is the meta_box id.
         *
         * @param array $cmb       This CMB2 object
         * @param int   $object_id The ID of the current object
         */
        do_action( "cmb2_{$object_type}_process_fields_{$this->cmb_id}", $this, $this->object_id() );

        return $this;
    }

    /**
     * Fires the "cmb2_save_{$object_type}_fields" and
     * "cmb2_save_{$object_type}_fields_{$cmb_id}" action hooks.
     *
     * @since  2.x.x
     *
     * @return CMB2
     */
    public function after_save() {
        $object_type = $this->object_type();
        $object_id   = $this->object_id();

        /**
         * Fires after all fields have been saved.
         *
         * The dynamic portion of the hook name, $object_type, refers to the metabox/form's object type
         * Usually `post` (this applies to all post-types).
         * Could also be `comment`, `user` or `options-page`.
         *
         * @param int    $object_id   The ID of the current object
         * @param array  $cmb_id      The current box ID
         * @param string $updated     Array of field ids that were updated.
         *                            Will only include field ids that had values change.
         * @param array  $cmb         This CMB2 object
         */
        do_action( "cmb2_save_{$object_type}_fields", $object_id, $this->cmb_id, $this->updated, $this );

        /**
         * Fires after all fields have been saved.
         *
         * The dynamic portion of the hook name, $this->cmb_id, is the meta_box id.
         *
         * The dynamic portion of the hook name, $object_type, refers to the metabox/form's object type
         * Usually `post` (this applies to all post-types).
         * Could also be `comment`, `user` or `options-page`.
         *
         * @param int    $object_id   The ID of the current object
         * @param string $updated     Array of field ids that were updated.
         *                            Will only include field ids that had values change.
         * @param array  $cmb         This CMB2 object
         */
        do_action( "cmb2_save_{$object_type}_fields_{$this->cmb_id}", $object_id, $this->updated, $this );

        return $this;
    }

    /**
     * Save a repeatable group
     *
     * @since  1.x.x
     * @param  array $args Field arguments array.
     * @return mixed        Return of CMB2_Field::update_data().
     */
    public function save_group( $args ) {
        if ( ! isset( $args['id'], $args['fields'] ) || ! is_array( $args['fields'] ) ) {
            return;
        }

        return $this->save_group_field( $this->get_new_field( $args ) );
    }

    /**
     * Save a repeatable group
     *
     * @since  1.x.x
     * @param  CMB2_Field $field_group CMB2_Field group field object.
     * @return mixed                   Return of CMB2_Field::update_data().
     */
    public function save_group_field( $field_group ) {
        $base_id = $field_group->id();

        if ( ! isset( $this->data_to_save[ $base_id ] ) ) {
            return;
        }

        $old        = $field_group->get_data();
        // Check if group field has sanitization_cb.
        $group_vals = $field_group->sanitization_cb( $this->data_to_save[ $base_id ] );
        $saved      = array();

        $field_group->index = 0;
        $field_group->data_to_save = $this->data_to_save;

        foreach ( array_values( $field_group->fields() ) as $field_args ) {
            if ( 'title' === $field_args['type'] ) {
                // Don't process title fields.
                continue;
            }

            $field  = $this->get_new_field( $field_args, $field_group );
            $sub_id = $field->id( true );
            if ( empty( $saved[ $field_group->index ] ) ) {
                $saved[ $field_group->index ] = array();
            }

            foreach ( (array) $group_vals as $field_group->index => $post_vals ) {

                // Get value.
                $new_val = isset( $group_vals[ $field_group->index ][ $sub_id ] )
                    ? $group_vals[ $field_group->index ][ $sub_id ]
                    : false;

                // Sanitize.
                $new_val = $field->sanitization_cb( $new_val );

                if ( is_array( $new_val ) && $field->args( 'has_supporting_data' ) ) {
                    if ( $field->args( 'repeatable' ) ) {
                        $_new_val = array();
                        foreach ( $new_val as $group_index => $grouped_data ) {
                            // Add the supporting data to the $saved array stack.
                            $saved[ $field_group->index ][ $grouped_data['supporting_field_id'] ][] = $grouped_data['supporting_field_value'];
                            // Reset var to the actual value.
                            $_new_val[ $group_index ] = $grouped_data['value'];
                        }
                        $new_val = $_new_val;
                    } else {
                        // Add the supporting data to the $saved array stack.
                        $saved[ $field_group->index ][ $new_val['supporting_field_id'] ] = $new_val['supporting_field_value'];
                        // Reset var to the actual value.
                        $new_val = $new_val['value'];
                    }
                }

                // Get old value.
                $old_val = is_array( $old ) && isset( $old[ $field_group->index ][ $sub_id ] )
                    ? $old[ $field_group->index ][ $sub_id ]
                    : false;

                $is_updated = ( ! CMB2_Utils::isempty( $new_val ) && $new_val !== $old_val );
                $is_removed = ( CMB2_Utils::isempty( $new_val ) && ! CMB2_Utils::isempty( $old_val ) );

                // Compare values and add to `$updated` array.
                if ( $is_updated || $is_removed ) {
                    $this->updated[] = $base_id . '::' . $field_group->index . '::' . $sub_id;
                }

                // Add to `$saved` array.
                $saved[ $field_group->index ][ $sub_id ] = $new_val;

            }// End foreach.

            $saved[ $field_group->index ] = CMB2_Utils::filter_empty( $saved[ $field_group->index ] );
        }// End foreach.

        $saved = CMB2_Utils::filter_empty( $saved );

        return $field_group->update_data( $saved, true );
    }

    /**
     * Get object id from global space if no id is provided
     *
     * @since  1.0.0
     * @param  integer|string $object_id Object ID.
     * @return integer|string $object_id Object ID.
     */
    public function object_id( $object_id = 0 ) {
        global $pagenow;

        if ( $object_id ) {
            $this->object_id = $object_id;
            return $this->object_id;
        }

        if ( $this->object_id ) {
            return $this->object_id;
        }

        // Try to get our object ID from the global space.
        switch ( $this->object_type() ) {
            case 'user':
                $object_id = isset( $_REQUEST['user_id'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['user_id'] ) ) : $object_id;
                $object_id = ! $object_id && 'user-new.php' !== $pagenow && isset( $GLOBALS['user_ID'] ) ? $GLOBALS['user_ID'] : $object_id;
                break;

            case 'comment':
                $object_id = isset( $_REQUEST['c'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['c'] ) ) : $object_id;
                $object_id = ! $object_id && isset( $GLOBALS['comments']->comment_ID ) ? $GLOBALS['comments']->comment_ID : $object_id;
                break;

            case 'term':
                $object_id = isset( $_REQUEST['tag_ID'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['tag_ID'] ) ) : $object_id;
                break;

            case 'options-page':
                $key = $this->doing_options_page();
                if ( ! empty( $key ) ) {
                    $object_id = $key;
                }
                break;

            default:
                $object_id = isset( $GLOBALS['post']->ID ) ? $GLOBALS['post']->ID : $object_id;
                $object_id = isset( $_REQUEST['post'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['post'] ) ) : $object_id;
                break;
        }

        // reset to id or 0.
        $this->object_id = $object_id ? $object_id : 0;

        return $this->object_id;
    }

    /**
     * Sets the $object_type based on metabox settings
     *
     * @since  1.0.0
     * @return string Object type.
     */
    public function mb_object_type() {
        if ( null !== $this->mb_object_type ) {
            return $this->mb_object_type;
        }

        if ( $this->is_options_page_mb() ) {
            $this->mb_object_type = 'options-page';
            return $this->mb_object_type;
        }

        $registered_types = $this->box_types();

        $type = '';

        // if it's an array of one, extract it.
        if ( 1 === count( $registered_types ) ) {
            $last = end( $registered_types );
            if ( is_string( $last ) ) {
                $type = $last;
            }
        } elseif ( ( $curr_type = $this->current_object_type() ) && in_array( $curr_type, $registered_types, true ) ) {
            $type = $curr_type;
        }

        // Get our object type.
        switch ( $type ) {

            case 'user':
            case 'comment':
            case 'term':
                $this->mb_object_type = $type;
                break;

            default:
                $this->mb_object_type = 'post';
                break;
        }

        return $this->mb_object_type;
    }

    /**
     * Gets the box 'object_types' array based on box settings.
     *
     * @since  2.2.3
     * @param  array $fallback Fallback value.
     *
     * @return array Object types.
     */
    public function box_types( $fallback = array() ) {
        return CMB2_Utils::ensure_array( $this->prop( 'object_types' ), $fallback );
    }

    /**
     * Check if given object_type(s) matches any of the registered object types or
     * taxonomies for this box.
     *
     * @since  2.7.0
     * @param  string|array $object_types The object type(s) to check.
     * @param  array        $fallback     Fallback object_types value.
     *
     * @return bool Whether given object type(s) are registered to this box.
     */
    public function is_box_type( $object_types = array(), $fallback = array() ) {
        $object_types = (array) $object_types;
        $box_types    = $this->box_types( $fallback );

        if ( in_array( 'term', $box_types, true ) ) {
            $taxonomies = CMB2_Utils::ensure_array( $this->prop( 'taxonomies' ) );
            $box_types = array_merge( $box_types, $taxonomies );
        }

        $found = array_intersect( $object_types, $box_types );

        return ! empty( $found );
    }

    /**
     * Initates the object types and option key for an options page metabox.
     *
     * @since  2.2.5
     *
     * @return void
     */
    public function init_options_mb() {
        $keys  = $this->options_page_keys();
        $types = $this->box_types();

        if ( empty( $keys ) ) {
            $keys = '';
            $types = $this->deinit_options_mb( $types );
        } else {

            // Make sure 'options-page' is one of the object types.
            $types[] = 'options-page';
        }

        // Set/Reset the option_key property.
        $this->set_prop( 'option_key', $keys );

        // Reset the object types.
        $this->set_prop( 'object_types', array_unique( $types ) );
    }

    /**
     * If object-page initiation failed, remove traces options page setup.
     *
     * @since  2.2.5
     *
     * @param array $types Array of types.
     * @return array
     */
    protected function deinit_options_mb( $types ) {
        if ( isset( $this->meta_box['show_on']['key'] ) && 'options-page' === $this->meta_box['show_on']['key'] ) {
            unset( $this->meta_box['show_on']['key'] );
        }

        if ( array_key_exists( 'options-page', $this->meta_box['show_on'] ) ) {
            unset( $this->meta_box['show_on']['options-page'] );
        }

        $index = array_search( 'options-page', $types );

        if ( false !== $index ) {
            unset( $types[ $index ] );
        }

        return $types;
    }

    /**
     * Determines if metabox is for an options page
     *
     * @since  1.0.1
     * @return boolean True/False.
     */
    public function is_options_page_mb() {
        return (
            // 'show_on' values checked for back-compatibility.
            $this->is_old_school_options_page_mb()
            || in_array( 'options-page', $this->box_types() )
        );
    }

    /**
     * Determines if metabox uses old-schoold options page config.
     *
     * @since  2.2.5
     * @return boolean True/False.
     */
    public function is_old_school_options_page_mb() {
        return (
            // 'show_on' values checked for back-compatibility.
            isset( $this->meta_box['show_on']['key'] ) && 'options-page' === $this->meta_box['show_on']['key']
            || array_key_exists( 'options-page', $this->meta_box['show_on'] )
        );
    }

    /**
     * Determine if we are on an options page (or saving the options page).
     *
     * @since  2.2.5
     *
     * @return bool
     */
    public function doing_options_page() {
        $found_key = false;
        $keys = $this->options_page_keys();

        if ( empty( $keys ) ) {
            return $found_key;
        }

        if ( ! empty( $_GET['page'] ) && in_array( $_GET['page'], $keys ) ) {
            $found_key = $_GET['page'];
        }

        if ( ! empty( $_POST['action'] ) && in_array( $_POST['action'], $keys ) ) {
            $found_key = $_POST['action'];
        }

        return $found_key ? $found_key : false;
    }

    /**
     * Get the options page key.
     *
     * @since  2.2.5
     * @return string|array
     */
    public function options_page_keys() {
        $key = '';
        if ( ! $this->is_options_page_mb() ) {
            return $key;
        }

        $values = null;
        if ( ! empty( $this->meta_box['show_on']['value'] ) ) {
            $values = $this->meta_box['show_on']['value'];
        } elseif ( ! empty( $this->meta_box['show_on']['options-page'] ) ) {
            $values = $this->meta_box['show_on']['options-page'];
        } elseif ( $this->prop( 'option_key' ) ) {
            $values = $this->prop( 'option_key' );
        }

        if ( $values ) {
            $key = $values;
        }

        if ( ! is_array( $key ) ) {
            $key = array( $key );
        }

        return $key;
    }

    /**
     * Returns the object type
     *
     * @since  1.0.0
     * @param string $object_type Type of object being saved. (e.g., post, user, or comment). Optional.
     * @return string Object type.
     */
    public function object_type( $object_type = '' ) {
        if ( $object_type ) {
            $this->object_type = $object_type;
            return $this->object_type;
        }

        if ( $this->object_type ) {
            return $this->object_type;
        }

        $this->object_type = $this->current_object_type();

        return $this->object_type;
    }

    /**
     * Get the object type for the current page, based on the $pagenow global.
     *
     * @since  2.2.2
     * @return string  Page object type name.
     */
    public function current_object_type() {
        global $pagenow;
        $type = 'post';

        if ( in_array( $pagenow, array( 'user-edit.php', 'profile.php', 'user-new.php' ), true ) ) {
            $type = 'user';
        }

        if ( in_array( $pagenow, array( 'edit-comments.php', 'comment.php' ), true ) ) {
            $type = 'comment';
        }

        if ( in_array( $pagenow, array( 'edit-tags.php', 'term.php' ), true ) ) {
            $type = 'term';
        }

        if ( defined( 'DOING_AJAX' ) && isset( $_POST['action'] ) && 'add-tag' === $_POST['action'] ) {
            $type = 'term';
        }

        if (
            in_array( $pagenow, array( 'admin.php', 'admin-post.php' ), true )
            && $this->doing_options_page()
        ) {
            $type = 'options-page';
        }

        return $type;
    }

    /**
     * Set metabox property.
     *
     * @since  2.2.2
     * @param  string $property Metabox config property to retrieve.
     * @param  mixed  $value    Value to set if no value found.
     * @return mixed            Metabox config property value or false.
     */
    public function set_prop( $property, $value ) {
        $this->meta_box[ $property ] = $value;

        return $this->prop( $property );
    }

    /**
     * Get metabox property and optionally set a fallback
     *
     * @since  2.0.0
     * @param  string $property Metabox config property to retrieve.
     * @param  mixed  $fallback Fallback value to set if no value found.
     * @return mixed            Metabox config property value or false.
     */
    public function prop( $property, $fallback = null ) {
        if ( array_key_exists( $property, $this->meta_box ) ) {
            return $this->meta_box[ $property ];
        } elseif ( $fallback ) {
            return $this->meta_box[ $property ] = $fallback;
        }
    }

    /**
     * Get a field object
     *
     * @since  2.0.3
     * @param  string|array|CMB2_Field $field        Metabox field id or field config array or CMB2_Field object.
     * @param  CMB2_Field|null         $field_group  (optional) CMB2_Field object (group parent).
     * @param  bool                    $reset_cached (optional) Reset the internal cache for this field object.
     *                                               Use sparingly.
     *
     * @return CMB2_Field|false                     CMB2_Field object (or false).
     */
    public function get_field( $field, $field_group = null, $reset_cached = false ) {
        if ( $field instanceof CMB2_Field ) {
            return $field;
        }

        $field_id = is_string( $field ) ? $field : $field['id'];

        $parent_field_id = ! empty( $field_group ) ? $field_group->id() : '';
        $ids = $this->get_field_ids( $field_id, $parent_field_id );

        if ( ! $ids ) {
            return false;
        }

        list( $field_id, $sub_field_id ) = $ids;

        $index = $field_id . ( $sub_field_id ? '|' . $sub_field_id : '' ) . ( $field_group ? '|' . $field_group->index : '' );

        if ( array_key_exists( $index, $this->fields ) && ! $reset_cached ) {
            return $this->fields[ $index ];
        }

        $this->fields[ $index ] = new CMB2_Field( $this->get_field_args( $field_id, $field, $sub_field_id, $field_group ) );

        return $this->fields[ $index ];
    }

    /**
     * Handles determining which type of arguments to pass to CMB2_Field
     *
     * @since  2.0.7
     * @param  mixed           $field_id     Field (or group field) ID.
     * @param  mixed           $field_args   Array of field arguments.
     * @param  mixed           $sub_field_id Sub field ID (if field_group exists).
     * @param  CMB2_Field|null $field_group  If a sub-field, will be the parent group CMB2_Field object.
     * @return array                         Array of CMB2_Field arguments.
     */
    public function get_field_args( $field_id, $field_args, $sub_field_id, $field_group ) {

        // Check if group is passed and if fields were added in the old-school fields array.
        if ( $field_group && ( $sub_field_id || 0 === $sub_field_id ) ) {

            // Update the fields array w/ any modified properties inherited from the group field.
            $this->meta_box['fields'][ $field_id ]['fields'][ $sub_field_id ] = $field_args;

            return $this->get_default_args( $field_args, $field_group );
        }

        if ( is_array( $field_args ) ) {
            $this->meta_box['fields'][ $field_id ] = array_merge( $field_args, $this->meta_box['fields'][ $field_id ] );
        }

        return $this->get_default_args( $this->meta_box['fields'][ $field_id ] );
    }

    /**
     * Get default field arguments specific to this CMB2 object.
     *
     * @since  2.2.0
     * @param  array      $field_args  Metabox field config array.
     * @param  CMB2_Field $field_group (optional) CMB2_Field object (group parent).
     * @return array                   Array of field arguments.
     */
    protected function get_default_args( $field_args, $field_group = null ) {
        if ( $field_group ) {
            $args = array(
                'field_args'  => $field_args,
                'group_field' => $field_group,
            );
        } else {
            $args = array(
                'field_args'  => $field_args,
                'object_type' => $this->object_type(),
                'object_id'   => $this->object_id(),
                'cmb_id'      => $this->cmb_id,
            );
        }

        return $args;
    }

    /**
     * When fields are added in the old-school way, intitate them as they should be
     *
     * @since 2.1.0
     * @param array $fields          Array of fields to add.
     * @param mixed $parent_field_id Parent field id or null.
     *
     * @return CMB2
     */
    protected function add_fields( $fields, $parent_field_id = null ) {
        foreach ( $fields as $field ) {

            $sub_fields = false;
            if ( array_key_exists( 'fields', $field ) ) {
                $sub_fields = $field['fields'];
                unset( $field['fields'] );
            }

            $field_id = $parent_field_id
                ? $this->add_group_field( $parent_field_id, $field )
                : $this->add_field( $field );

            if ( $sub_fields ) {
                $this->add_fields( $sub_fields, $field_id );
            }
        }

        return $this;
    }

    /**
     * Add a field to the metabox
     *
     * @since  2.0.0
     * @param  array $field    Metabox field config array.
     * @param  int   $position (optional) Position of metabox. 1 for first, etc.
     * @return string|false    Field id or false.
     */
    public function add_field( array $field, $position = 0 ) {
        if ( ! array_key_exists( 'id', $field ) ) {
            return false;
        }

        $this->_add_field_to_array(
            $field,
            $this->meta_box['fields'],
            $position
        );

        return $field['id'];
    }

    /**
     * Add a field to a group
     *
     * @since  2.0.0
     * @param  string $parent_field_id The field id of the group field to add the field.
     * @param  array  $field           Metabox field config array.
     * @param  int    $position        (optional) Position of metabox. 1 for first, etc.
     * @return mixed                   Array of parent/field ids or false.
     */
    public function add_group_field( $parent_field_id, array $field, $position = 0 ) {
        if ( ! array_key_exists( $parent_field_id, $this->meta_box['fields'] ) ) {
            return false;
        }

        $parent_field = $this->meta_box['fields'][ $parent_field_id ];

        if ( 'group' !== $parent_field['type'] ) {
            return false;
        }

        if ( ! isset( $parent_field['fields'] ) ) {
            $this->meta_box['fields'][ $parent_field_id ]['fields'] = array();
        }

        $this->_add_field_to_array(
            $field,
            $this->meta_box['fields'][ $parent_field_id ]['fields'],
            $position
        );

        return array( $parent_field_id, $field['id'] );
    }

    /**
     * Perform some field-type-specific initiation actions.
     *
     * @since  2.7.0
     * @param  array $field Metabox field config array.
     * @return void
     */
    protected function field_actions( $field ) {
        switch ( $field['type'] ) {
            case 'file':
            case 'file_list':

                // Initiate attachment JS hooks.
                add_filter( 'wp_prepare_attachment_for_js', array( 'CMB2_Type_File_Base', 'prepare_image_sizes_for_js' ), 10, 3 );
                break;

            case 'oembed':
                // Initiate oembed Ajax hooks.
                cmb2_ajax();
                break;

            case 'group':
                if ( empty( $field['render_row_cb'] ) ) {
                    $field['render_row_cb'] = array( $this, 'render_group_callback' );
                }
                break;
            case 'colorpicker':

                // https://github.com/JayWood/CMB2_RGBa_Picker
                // Dequeue the rgba_colorpicker custom field script if it is used,
                // since we now enqueue our own more current version.
                add_action( 'admin_enqueue_scripts', array( 'CMB2_Type_Colorpicker', 'dequeue_rgba_colorpicker_script' ), 99 );
                break;
        }

        if ( isset( $field['column'] ) && false !== $field['column'] ) {
            $field = $this->define_field_column( $field );
        }

        if ( isset( $field['taxonomy'] ) && ! empty( $field['remove_default'] ) ) {
            $this->tax_metaboxes_to_remove[ $field['taxonomy'] ] = $field['taxonomy'];
        }

        return $field;
    }

    /**
     * Defines a field's column if requesting to be show in admin columns.
     *
     * @since  2.2.3
     * @param  array $field Metabox field config array.
     * @return array         Modified metabox field config array.
     */
    protected function define_field_column( array $field ) {
        $this->has_columns = true;

        $column = is_array( $field['column'] ) ? $field['column'] : array();

        $field['column'] = wp_parse_args( $column, array(
            'name'     => isset( $field['name'] ) ? $field['name'] : '',
            'position' => false,
        ) );

        return $field;
    }

    /**
     * Add a field array to a fields array in desired position
     *
     * @since 2.0.2
     * @param array   $field    Metabox field config array.
     * @param array   $fields   Array (passed by reference) to append the field (array) to.
     * @param integer $position Optionally specify a position in the array to be inserted.
     */
    protected function _add_field_to_array( $field, &$fields, $position = 0 ) {
        $field = $this->field_actions( $field );

        if ( $position ) {
            CMB2_Utils::array_insert( $fields, array( $field['id'] => $field ), $position );
        } else {
            $fields[ $field['id'] ] = $field;
        }
    }

    /**
     * Remove a field from the metabox
     *
     * @since 2.0.0
     * @param  string $field_id        The field id of the field to remove.
     * @param  string $parent_field_id (optional) The field id of the group field to remove field from.
     * @return bool                    True if field was removed.
     */
    public function remove_field( $field_id, $parent_field_id = '' ) {
        $ids = $this->get_field_ids( $field_id, $parent_field_id );

        if ( ! $ids ) {
            return false;
        }

        list( $field_id, $sub_field_id ) = $ids;

        unset( $this->fields[ implode( '', $ids ) ] );

        if ( ! $sub_field_id ) {
            unset( $this->meta_box['fields'][ $field_id ] );
            return true;
        }

        if ( isset( $this->fields[ $field_id ]->args['fields'][ $sub_field_id ] ) ) {
            unset( $this->fields[ $field_id ]->args['fields'][ $sub_field_id ] );
        }
        if ( isset( $this->meta_box['fields'][ $field_id ]['fields'][ $sub_field_id ] ) ) {
            unset( $this->meta_box['fields'][ $field_id ]['fields'][ $sub_field_id ] );
        }

        return true;
    }

    /**
     * Update or add a property to a field
     *
     * @since  2.0.0
     * @param  string $field_id        Field id.
     * @param  string $property        Field property to set/update.
     * @param  mixed  $value           Value to set the field property.
     * @param  string $parent_field_id (optional) The field id of the group field to remove field from.
     * @return mixed                   Field id. Strict compare to false, as success can return a falsey value (like 0).
     */
    public function update_field_property( $field_id, $property, $value, $parent_field_id = '' ) {
        $ids = $this->get_field_ids( $field_id, $parent_field_id );

        if ( ! $ids ) {
            return false;
        }

        list( $field_id, $sub_field_id ) = $ids;

        if ( ! $sub_field_id ) {
            $this->meta_box['fields'][ $field_id ][ $property ] = $value;
            return $field_id;
        }

        $this->meta_box['fields'][ $field_id ]['fields'][ $sub_field_id ][ $property ] = $value;
        return $field_id;
    }

    /**
     * Check if field ids match a field and return the index/field id
     *
     * @since  2.0.2
     * @param  string $field_id        Field id.
     * @param  string $parent_field_id (optional) Parent field id.
     * @return mixed                    Array of field/parent ids, or false.
     */
    public function get_field_ids( $field_id, $parent_field_id = '' ) {
        $sub_field_id = $parent_field_id ? $field_id : '';
        $field_id     = $parent_field_id ? $parent_field_id : $field_id;
        $fields       =& $this->meta_box['fields'];

        if ( ! array_key_exists( $field_id, $fields ) ) {
            $field_id = $this->search_old_school_array( $field_id, $fields );
        }

        if ( false === $field_id ) {
            return false;
        }

        if ( ! $sub_field_id ) {
            return array( $field_id, $sub_field_id );
        }

        if ( 'group' !== $fields[ $field_id ]['type'] ) {
            return false;
        }

        if ( ! array_key_exists( $sub_field_id, $fields[ $field_id ]['fields'] ) ) {
            $sub_field_id = $this->search_old_school_array( $sub_field_id, $fields[ $field_id ]['fields'] );
        }

        return false === $sub_field_id ? false : array( $field_id, $sub_field_id );
    }

    /**
     * When using the old array filter, it is unlikely field array indexes will be the field id.
     *
     * @since  2.0.2
     * @param  string $field_id The field id.
     * @param  array  $fields   Array of fields to search.
     * @return mixed            Field index or false.
     */
    public function search_old_school_array( $field_id, $fields ) {
        $ids = wp_list_pluck( $fields, 'id' );
        $index = array_search( $field_id, $ids );
        return false !== $index ? $index : false;
    }

    /**
     * Handles metabox property callbacks, and passes this $cmb object as property.
     *
     * @since 2.2.3
     * @param  callable $cb                The callback method/function/closure.
     * @param  mixed    $additional_params Any additoinal parameters which should be passed to the callback.
     * @return mixed                       Return of the callback function.
     */
    public function do_callback( $cb, $additional_params = null ) {
        return call_user_func( $cb, $this, $additional_params );
    }

    /**
     * Generate a unique nonce field for each registered meta_box
     *
     * @since  2.0.0
     * @return void
     */
    public function nonce_field() {
        wp_nonce_field( $this->nonce(), $this->nonce(), false, true );
    }

    /**
     * Generate a unique nonce for each registered meta_box
     *
     * @since  2.0.0
     * @return string unique nonce string.
     */
    public function nonce() {
        if ( ! $this->generated_nonce ) {
            $this->generated_nonce = sanitize_html_class( 'nonce_' . basename( __FILE__ ) . $this->cmb_id );
        }

        return $this->generated_nonce;
    }

    /**
     * Checks if field-saving updated any fields.
     *
     * @since  2.2.5
     *
     * @return bool
     */
    public function was_updated() {
        return ! empty( $this->updated );
    }

    /**
     * Whether this box is an "alternate context" box. This means the box has a 'context' property defined as:
     * 'form_top', 'before_permalink', 'after_title', or 'after_editor'.
     *
     * @since  2.2.4
     * @return bool
     */
    public function is_alternate_context_box() {
        return $this->prop( 'context' ) && in_array( $this->prop( 'context' ), array( 'form_top', 'before_permalink', 'after_title', 'after_editor' ), true );
    }

    /**
     * Magic getter for our object.
     *
     * @param  string $property Object property.
     * @throws Exception Throws an exception if the field is invalid.
     * @return mixed
     */
    public function __get( $property ) {
        switch ( $property ) {
            case 'updated':
            case 'has_columns':
            case 'tax_metaboxes_to_remove':
                return $this->{$property};
            default:
                return parent::__get( $property );
        }
    }

}
CMB2 Documentation API documentation generated by ApiGen