class-gravityview-field-multiselect.php

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<?php
/**
 * @file class-gravityview-field-multiselect.php
 * @package GravityView
 * @subpackage includes\fields
 */

class GravityView_Field_MultiSelect extends GravityView_Field {

    var $name = 'multiselect';

    /**
     * @see GFCommon::get_field_filter_settings Gravity Forms suggests checkboxes should just be "contains"
     * @var array
     */
    var $search_operators = array( 'is', 'in', 'not in', 'isnot', 'contains');

    var $is_searchable = true;

    /** @see GF_Field_MultiSelect */
    var $_gf_field_class_name = 'GF_Field_MultiSelect';

    var $group = 'standard';

    var $icon = 'dashicons-editor-ul';

    public function __construct() {
        $this->label = esc_html__( 'Multi Select', 'gk-gravityview' );
        parent::__construct();
    }

    /**
     * Add `choice_display` setting to the field
     *
     * @param array $field_options
     * @param string $template_id
     * @param string $field_id
     * @param string $context
     * @param string $input_type
     *
     * @since 2.0
     *
     * @return array
     */
    public function field_options( $field_options, $template_id, $field_id, $context, $input_type, $form_id ) {

        // Set the $_field_id var
        $field_options = parent::field_options( $field_options, $template_id, $field_id, $context, $input_type, $form_id );

        if( $this->is_choice_value_enabled() ) {
            $field_options['choice_display'] = array(
                'type'    => 'radio',
                'value'   => 'value',
                'label'   => __( 'What should be displayed:', 'gk-gravityview' ),
                'desc'    => __( 'This input has a label and a value. What should be displayed?', 'gk-gravityview' ),
                'choices' => array(
                    'value' => __( 'Value of the input', 'gk-gravityview' ),
                    'label' => __( 'Label of the input', 'gk-gravityview' ),
                ),
                'group'   => 'display',
            );
        }

        return $field_options;
    }
}

new GravityView_Field_MultiSelect;