JsSelectToInput.php

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<?php
class JsSelectToInput {
    protected $targetId;
    protected $sourceId;

    protected $select;

    protected $buttonId;

    protected $msg = 'translate-jssti-add';

    public function __construct( XmlSelect $select = null ) {
        $this->select = $select;
    }

    public function setSourceId( $id ) {
        $this->sourceId = $id;
    }

    public function getSourceId() {
        return $this->sourceId;
    }

    public function setTargetId( $id ) {
        $this->targetId = $id;
    }

    public function getTargetId() {
        return $this->targetId;
    }

    public function setMessage( $message ) {
        $this->msg = $message;
    }

    public function getMessage() {
        return $this->msg;
    }

    public function getHtmlAndPrepareJS() {
        if ( $this->sourceId === false ) {
            if ( is_callable( array( $this->select, 'getAttribute' ) ) ) {
                $this->sourceId = $this->select->getAttribute['id'];
            }

            if ( !$this->sourceId ) {
                throw new MWException( "ID needs to be specified for the selector" );
            }
        }

        self::injectJs();
        $html = $this->select->getHtml();
        $html .= $this->getButton( $this->msg, $this->sourceId, $this->targetId );

        return $html;
    }

    protected function getButton( $msg, $source, $target ) {
        $source = Xml::escapeJsString( $source );
        $target = Xml::escapeJsString( $target );
        $html = Xml::element( 'input', array(
            'type' => 'button',
            'value' => wfMessage( $msg )->text(),
            'onclick' => "appendFromSelect( '$source', '$target' );"
        ) );

        return $html;
    }

    public static function injectJs() {
        static $done = false;
        if ( $done ) {
            return;
        }

        RequestContext::getMain()->getOutput()->addModules( 'ext.translate.selecttoinput' );
    }
}