HTMLSelectField.php

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<?php

class HTMLSelectField extends HTMLFormField {
    function validate( $value, $alldata ) {
        $p = parent::validate( $value, $alldata );

        if ( $p !== true ) {
            return $p;
        }

        $validOptions = HTMLFormField::flattenOptions( $this->getOptions() );

        if ( in_array( strval( $value ), $validOptions, true ) ) {
            return true;
        } else {
            return $this->msg( 'htmlform-select-badoption' )->parse();
        }
    }

    function getInputHTML( $value ) {
        $select = new XmlSelect( $this->mName, $this->mID, strval( $value ) );

        if ( !empty( $this->mParams['disabled'] ) ) {
            $select->setAttribute( 'disabled', 'disabled' );
        }

        $allowedParams = [ 'tabindex', 'size' ];
        $customParams = $this->getAttributes( $allowedParams );
        foreach ( $customParams as $name => $value ) {
            $select->setAttribute( $name, $value );
        }

        if ( $this->mClass !== '' ) {
            $select->setAttribute( 'class', $this->mClass );
        }

        $select->addOptions( $this->getOptions() );

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

    protected function shouldInfuseOOUI() {
        return true;
    }
}