HTMLHiddenField.php

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<?php

class HTMLHiddenField extends HTMLFormField {
    public function __construct( $params ) {
        parent::__construct( $params );

        # Per HTML5 spec, hidden fields cannot be 'required'
        # http://dev.w3.org/html5/spec/states-of-the-type-attribute.html#hidden-state
        unset( $this->mParams['required'] );
    }

    public function getTableRow( $value ) {
        $params = array();
        if ( $this->mID ) {
            $params['id'] = $this->mID;
        }

        $this->mParent->addHiddenField( $this->mName, $this->mDefault, $params );

        return '';
    }

    public function getDiv( $value ) {
        return $this->getTableRow( $value );
    }

    public function getRaw( $value ) {
        return $this->getTableRow( $value );
    }

    public function getInputHTML( $value ) {
        return '';
    }
}