HTMLComboboxField.php

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<?php

class HTMLComboboxField extends HTMLTextField {
    // FIXME Ewww, this shouldn't be adding any attributes not requested in $list :(
    public function getAttributes( array $list ) {
        $attribs = [
            'type' => 'text',
            'list' => $this->mName . '-datalist',
        ] + parent::getAttributes( $list );

        return $attribs;
    }

    function getInputHTML( $value ) {
        $datalist = new XmlSelect( false, $this->mName . '-datalist' );
        $datalist->setTagName( 'datalist' );
        $datalist->addOptions( $this->getOptions() );

        return parent::getInputHTML( $value ) . $datalist->getHTML();
    }

    function getInputOOUI( $value ) {
        $disabled = false;
        $allowedParams = [ 'tabindex' ];
        $attribs = OOUI\Element::configFromHtmlAttributes(
            $this->getAttributes( $allowedParams )
        );

        if ( $this->mClass !== '' ) {
            $attribs['classes'] = [ $this->mClass ];
        }

        if ( !empty( $this->mParams['disabled'] ) ) {
            $disabled = true;
        }

        return new OOUI\ComboBoxInputWidget( [
            'name' => $this->mName,
            'id' => $this->mID,
            'options' => $this->getOptionsOOUI(),
            'value' => strval( $value ),
            'disabled' => $disabled,
        ] + $attribs );
    }
}