How to solve the problem "cannot call the method ... from undefined"?

Question

function calcRoute() { var start = document.getElementById("start_").value; var end = document.getElementById("end_").value; var request = { origin: start, destination: end, travelMode: google.maps.TravelMode.DRIVING }; directionsService.route(request, function (response, status) { if (status == google.maps.DirectionsStatus.OK) { directionsDisplay.setDirections(response); } }); } 

Provides an error message in Chrome: "Uncaught TypeError: Unable to call setDirections method from undefined". Can anyone suggest a fix for this? thanks

Answer 1

Missing (global var)

 //var directionsService = new google.maps.DirectionsService(); var directionsDisplay = new google.maps.DirectionsRenderer({ 'map': map }); 

So directionsDisplay - undefined.