HTMLSelectOrOtherField.php

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<?php

class HTMLSelectOrOtherField extends HTMLTextField {
    function __construct( $params ) {
        parent::__construct( $params );
        $this->getOptions();
        if ( !in_array( 'other', $this->mOptions, true ) ) {
            $msg =
                isset( $params['other'] )
                    ? $params['other']
                    : wfMessage( 'htmlform-selectorother-other' )->text();
            // Have 'other' always as first element
            $this->mOptions = [ $msg => 'other' ] + $this->mOptions;
        }

    }

    function getInputHTML( $value ) {
        $valInSelect = false;

        if ( $value !== false ) {
            $value = strval( $value );
            $valInSelect = in_array(
                $value, HTMLFormField::flattenOptions( $this->getOptions() ), true
            );
        }

        $selected = $valInSelect ? $value : 'other';

        $select = new XmlSelect( $this->mName, $this->mID, $selected );
        $select->addOptions( $this->getOptions() );

        $select->setAttribute( 'class', 'mw-htmlform-select-or-other' );

        $tbAttribs = [ 'id' => $this->mID . '-other', 'size' => $this->getSize() ];

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

        if ( isset( $this->mParams['tabindex'] ) ) {
            $select->setAttribute( 'tabindex', $this->mParams['tabindex'] );
            $tbAttribs['tabindex'] = $this->mParams['tabindex'];
        }

        $select = $select->getHTML();

        if ( isset( $this->mParams['maxlength'] ) ) {
            $tbAttribs['maxlength'] = $this->mParams['maxlength'];
        }

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

        $textbox = Html::input( $this->mName . '-other', $valInSelect ? '' : $value, 'text', $tbAttribs );

        return "$select<br />\n$textbox";
    }

    function getInputOOUI( $value ) {
        return false;
    }

    function loadDataFromRequest( $request ) {
        if ( $request->getCheck( $this->mName ) ) {
            $val = $request->getText( $this->mName );

            if ( $val === 'other' ) {
                $val = $request->getText( $this->mName . '-other' );
            }

            return $val;
        } else {
            return $this->getDefault();
        }
    }
}