Remote data querying for Twitter Bootstrap 2.0 Typeahead without modifications

jane-typeahead.js

<script>
// Charles Lawrence - Feb 16, 2012. Free to use and modify. Please attribute back to @geuis if you find this useful
// Twitter Bootstrap Typeahead doesn't support remote data querying. This is an expected feature in the future. In the meantime, others have submitted patches to the core bootstrap component that allow it. 
// The following will allow remote autocompletes *without* modifying any officially released core code. 
// If others find ways to improve this, please share.
                        <!-- Typeahead by Charles Lawrence https://gist.github.com/1848558-->
                        <script type="text/javascript">
                            var autocomplete = $('#stops').typeahead()
                                .on('keyup', function(ev){

                                    ev.stopPropagation();
                                    ev.preventDefault();

                                    //filter out up/down, tab, enter, and escape keys
                                    if( $.inArray(ev.keyCode,[40,38,9,13,27]) === -1 ){
                                        var self = $(this);                                        
                                        //set typeahead source to empty
                                        self.data('typeahead').source = [];
                                        //active used so we aren't triggering duplicate keyup events
                                        if( !self.data('active') && self.val().length > 0){
                                            self.data('active', true);
                                            //Do data request. Insert your own API logic here.
                                            $.getJSON("/data.json",{
                                                q: $(this).val()
                                            }, function(data) {
                                                //alert(data.stopnames);
                                                //set this to true when your callback executes
                                                self.data('active',true);
                                                //Filter out your own parameters. Populate them into an array, since this is what typeahead's source requires
                                                var arr = [],
                                                    i=data.SETNAME.length;
                                                while(i--){
                                                    arr[i] = data.SETNAME[i];
                                                }
                                                //set your results into the typehead's source 
                                                self.data('typeahead').source = arr;
                                                //trigger keyup on the typeahead to make it search
                                                self.trigger('keyup');
                                                //All done, set to false to prepare for the next remote query.
                                                self.data('active', false);
                                            });
                                        }
                                    }
                                });
                        </script>   
                        <!--End Typeahead -->