type_textarea.php

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<?php
/**
 * textarea input type
 */
class GravityView_FieldType_textarea extends GravityView_FieldType {

    function render_option() {

        ?>
        <label for="<?php echo $this->get_field_id(); ?>" class="<?php echo $this->get_label_class(); ?>"><?php

            echo '<span class="gv-label">'.$this->get_field_label().'</span>';
            echo $this->get_tooltip() . $this->get_field_desc();
        ?><div>
                <?php $this->render_input(); ?>
            </div>
        </label>
        <?php
    }

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

        $class = 'widefat mt-wp_editor codemirror ';

        $show_mt = $this->show_merge_tags();

        if( $show_mt && $this->field['merge_tags'] !== false || $this->field['merge_tags'] === 'force' ) {
            $class .= ' merge-tag-support mt-position-right ';

            if( empty( $this->field['show_all_fields'] ) ) {
                $class .= ' mt-hide_all_fields ';
            }
        }

        $class .= rgar( $this->field, 'class' );
        $placeholder = rgar( $this->field, 'placeholder' );

        /**
         * @since 1.22.5
         */
        $default_rows = apply_filters( 'gravityview/admin/field-types/textarea/rows', 5 );

        $rows = rgar( $this->field, 'rows', $default_rows );

#       $this->codemirror( $this->get_field_id() );

        ?>
        <textarea name="<?php echo esc_attr( $this->name ); ?>" placeholder="<?php echo esc_attr( $placeholder ); ?>" id="<?php echo $this->get_field_id(); ?>" class="<?php echo gravityview_sanitize_html_class( $class ); ?>" rows="<?php echo absint( $rows ); ?>"><?php echo esc_textarea(  $this->value ); ?></textarea>
        <?php
    }

    function codemirror( $field_id = '' ) {

        // Enqueue code editor and settings for manipulating HTML.
        $settings = wp_enqueue_code_editor( array( 'type' => 'text/html' ) );

        // Bail if user disabled CodeMirror.
        if ( false === $settings ) {
            return;
        }

        ?>

        <script>
            wp.codeEditor.initialize( "<?php echo $field_id;?>", {});
        </script>
    <?php
    }

}