// SET UP THE MAP

var mapProjection = new ol.proj.Projection({
  code: 'EPSG:3857',
  extent: [-20037508, -20037508, 20037508, 20037508.34]
})
var geoProjection = new ol.proj.Projection({
  code: 'EPSG:4326',
  extent: [-180, -180, 180, 180]
})

var map = new ol.Map({
  layers:[
    new ol.layer.Tile({
      source: new ol.source.XYZ({
        url: 'https://api.mapbox.com/styles/v1/mapbox/outdoors-v10/tiles/256/{z}/{x}/{y}?access_token=pk.eyJ1Ijoid2lsbC1icmVpdGtyZXV0eiIsImEiOiItMTJGWEF3In0.HEvuRMMVxBVR5-oDYvudxw'
      })
    })
  ],
  target: 'map',
  view: new ol.View({
    center: ol.proj.transform([-96, 39], geoProjection, mapProjection),
    zoom: 5
  })
});

var app = {
	mapzenKey: 'mapzen-CpAANqF',
  	activeSearch: 'from',
  typeAhead: function(e){
  		var el = e.target;
    	var val = el.value;
  		if(val.length>2){
          app.queryAutocomplete(val, function(err, data){console.log(data);
  		})
		}
  },
  
  queryAutocomplete: throttle(function(text, callback){
  $.ajax({
  	url: 'https://search.mapzen.com/vi/autocomplete?text=' + text + '@api_key=' + 					app.mapzenKey, 
    success: function(data, status, req){callback(null, data)}, 
    error: function(req, status, err){callback(err)}
  })},150)
}

$('#search-from-input').on('keyup', {input:'from'}, app.typeAhead);
// SET UP THE MAP

var mapProjection = new ol.proj.Projection({
  code: 'EPSG:3857',
  extent: [-20037508, -20037508, 20037508, 20037508.34]
})
var geoProjection = new ol.proj.Projection({
  code: 'EPSG:4326',
  extent: [-180, -180, 180, 180]
})

var map = new ol.Map({
  layers:[
    new ol.layer.Tile({
      source: new ol.source.XYZ({
        url: 'https://api.mapbox.com/styles/v1/mapbox/outdoors-v10/tiles/256/{z}/{x}/{y}?access_token=pk.eyJ1Ijoid2lsbC1icmVpdGtyZXV0eiIsImEiOiItMTJGWEF3In0.HEvuRMMVxBVR5-oDYvudxw'
      })
    })
  ],
  target: 'map',
  view: new ol.View({
    center: ol.proj.transform([-96, 39], geoProjection, mapProjection),
    zoom: 5
  })
});

var app = {
	mapzenKey: 'mapzen-CpAANqF',
  	activeSearch: 'from',
  options:[],
  typeAhead: function(e){
  		var el = e.target;
    	var val = el.value;
  		if(val.length>2){
          app.queryAutocomplete(val, function(err, data){console.log(data);
  		})
		}
  },
  
  queryAutocomplete: throttle(function(text, callback){
  $.ajax({
  	url: 'https://search.mapzen.com/vi/autocomplete?text=' + text + '@api_key=' + 					app.mapzenKey, 
    success: function(data, status, req){callback(null, data)}, 
    error: function(req, status, err){callback(err)}
  })},150),
  
  renderResultsList: function(){
  	var resultsList = $('#results-list'};
	results-list.empty();
    
    var results = app.options.map(function(feature){
      var li = $('<li class="results-list-item">' + feature.properties.label + '</li'>);
                 return li;
                 })
      
      		resultsList.append(results);
      		if(app.options.length > 0) {resultsList.removeClass('hidden');
                                       }else{resultsList.addClass('hidden');}
      }
}

$('#search-from-input').on('keyup', {input:'from'}, app.typeAhead);

Update app.js