type_checkboxes.php

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<?php
/**
 * Checkboxes input type - show a group of checkboxes
 * Supports a "requires", which is the name of another checkbox in the same setting. If set, the checkbox will be shown only if "requires" checkbox is checked as well.
 * @since 1.17
 */
class GravityView_FieldType_checkboxes extends GravityView_FieldType {

    function render_option() {
        ?>
        <fieldset class="<?php echo $this->get_label_class(); ?>">
            <legend><span class="gv-label"><?php echo $this->get_field_label(); ?></span></legend>
        <?php

            echo $this->get_tooltip() . $this->get_field_desc();

            $this->render_input();

        ?>
        </fieldset>
        <?php
    }

    function render_input( $override_input = null ) {
        if( isset( $override_input ) ) {
            echo $override_input;
            return;
        }

        ?>
        <ul class="gv-setting-list">
        <?php
        foreach( $this->field['options'] as $value => $label ) { ?>
            <li <?php if( isset( $label['requires'] ) ) { printf( 'class="gv-sub-setting" data-requires="%s"', $label['requires'] ); } ?>>
                <label>
                <input name="<?php printf( '%s[%s]', esc_attr( $this->name ), esc_attr( $value ) ); ?>" type="hidden"
                       value="0"/>
                <input name="<?php printf( '%s[%s]', esc_attr( $this->name ), esc_attr( $value ) ); ?>"
                       id="<?php echo $this->get_field_id(); ?>" type="checkbox"
                       value="1" <?php checked( ! empty( $this->value[ $value ] ) ); ?> />
                <?php echo esc_html( $label['label'] ); ?>
                </label>
                <?php if( ! empty( $label['desc'] ) ) {
                    printf( '<span class="howto">%s</span>', $label['desc'] );
                }
                ?>
            </li>
            <?php
        }
        ?>
        </ul>
        <?php
    }

}