type_multiselect.php

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<?php
/**
 * Display admin multiselect field type
 * @since 1.17.3
 */

/**
 * multiselect
 */
class GravityView_FieldType_multiselect 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();

            $this->render_input();

            ?>
        </label>
        <?php
    }

    function render_input( $override_input = null ) {

        if( isset( $override_input ) ) {
            echo $override_input;
            return;
        }

        ?>
        <select name="<?php echo esc_attr( $this->name ); ?>[]" id="<?php echo $this->get_field_id(); ?>" multiple="multiple">
            <?php foreach( $this->field['options'] as $value => $label ) : ?>
                <option value="<?php echo esc_attr( $value ); ?>" <?php selected( in_array( $value, (array)$this->value ), true, true ); ?>><?php echo esc_html( $label ); ?></option>
            <?php endforeach; ?>
        </select>
        <?php
    }
}