HTMLJsSelectToInputField.php

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<?php
class HTMLJsSelectToInputField extends HTMLTextField {
    function getInputHTML( $value ) {
        $input = parent::getInputHTML( $value );

        if ( isset( $this->mParams['select'] ) ) {
            $select = $this->mParams['select'];
            $input = $select->getHtmlAndPrepareJs() . '<br />' . $input;
        }

        return $input;
    }

    function tidy( $value ) {
        $value = array_map( 'trim', explode( ',', $value ) );
        $value = array_unique( array_filter( $value ) );

        return $value;
    }

    function validate( $value, $alldata ) {
        $p = parent::validate( $value, $alldata );

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

        if ( !isset( $this->mParams['valid-values'] ) ) {
            return true;
        }

        if ( $value === 'default' ) {
            return true;
        }

        $codes = $this->tidy( $value );
        $valid = array_flip( $this->mParams['valid-values'] );

        foreach ( $codes as $code ) {
            if ( !isset( $valid[$code] ) ) {
                return wfMessage( 'translate-pref-editassistlang-bad', $code )->parseAsBlock();
            }
        }

        return true;
    }

    function filter( $value, $alldata ) {
        $value = parent::filter( $value, $alldata );

        return implode( ', ', $this->tidy( $value ) );
    }
}