Google Maps API：绘制路线时归零或无效请求

Question

I am trying to draw a route based on the co-ordinates that i receive from the database. But somehow i am not able to draw. I either get ZERO RESULTS or INVALID REQUEST .. The route i am trying to draw is a TRANSIT ROUTE. Where as i found some similar issues( Link ) being addressed in the site but the solution given was to add departure time or arrival time in the parameters. And it was an accepted answer. The same which i tried is not working currently. I have posted the code that i have tried. Below are the co-ordinates:

19.1860640243063 72.9759523272514
19.1902699 73.023094
19.2178474133021 73.086293040406
19.2354157727173 73.1302742969937

Please help.

 load : function(response) 
        {
            for(var i=0;i<response.length;i++)
            {
                if(response[i].linkData!='undefined')
                {
                 link=response[i].linkData;
                 var lastPos=(response.length-1);
                 linkDes=response[lastPos].linkData;    
                 var linkDes=link.split(" ");       
                 var linkValue=link.split(" ");                                          
                 var latDes= parseFloat(linkDes[0]);                
                 var longDes= parseFloat(linkDes[1]);           
                 var lat = parseFloat(linkValue[0]);  //convert string to float                 
                 var lon = parseFloat(linkValue[1]);  //convert string to float             
                 if(count==0)
                 {   
                   var source=new google.maps.LatLng(lat, lon); 
                   count++;
                 }  
                 if(i!=0 )  
                 {
                     geoLatLong=new google.maps.LatLng(lat, lon); 
                      count++;
                 }
                 if(i!=response.length-1)
                 {
                     geoLatLong=new google.maps.LatLng(lat, lon);   
                 }
                 if(latDes!="" && longDes!="")
                  {         
                     var destination=new google.maps.LatLng(latDes, longDes); 
                  }
                  if(count>1 && count<=response.length-1) 
                  {
                   geoLatLongArray.push(geoLatLong);   
                  }

                }
            }
            for(var i=0;i<geoLatLongArray.length;i++)
            {
              waypts.push({location:geoLatLongArray[i],stopover:true}); 
            }
            var request = {
                    origin: source,
                    destination: destination,
                    waypoints: waypts,
                   optimizeWaypoints: true,

                    travelMode: google.maps.DirectionsTravelMode.TRANSIT,
                    transitOptions: 
                    {
                     departureTime: new Date()   
                    }
                };
                directionsService.route(request, function(response, status) {
                  if (status == google.maps.DirectionsStatus.OK) {
                    directionsDisplay.setDirections(response);
                  } else {
                    alert("directions response "+status);
                  }
                });
        }

Answer 1

According to v3 API Docs

google.maps.TravelMode.TRANSIT

is the correct syntax.

Answer 2

I had similar issue. I fixed it after making origin to an address field (instead of coordinates). this issue persists only when both origin and destination are coordinates.

You can perhaps convert your coordinates into address using Reverse Geocode API and then pass the converted addresses to origin / destination.