public function getAutocompleteKey()
    {
        if (false === $this->isAutocomplete()) {
            return null;
        }
        return $this->getFilter(self::FILTER_AUTOCOMPLETE)[self::FILTER_AUTOCOMPLETE_KEY];
    }
public function getAutocompleteKey()
    {
        if (false === $this->isAutocomplete()) {
            return null;
        }
        return $this->getFilter(self::FILTER_AUTOCOMPLETE)[self::FILTER_AUTOCOMPLETE_KEY];
    }
public function getAutocompleteKey ( ) { if ( false === $ this -> isAutocomplete ( ) ) { return null ; } return $ this -> getFilter ( self :: FILTER_AUTOCOMPLETE ) [ self :: FILTER_AUTOCOMPLETE_KEY ] ; }
Gets the autocomplete attribute key.

@return  string|null
Gets the autocomplete attribute key .