Directions request failed due to OVER_QUERY_LIMIT

Question

I am implementing google map in Angular 5 using npm library googlemaps.

 

When trying to show route/path between 2 points using setDirections().The 2 points are shown but no route is drawn and getting "Directions request failed due to OVER_QUERY_LIMIT". I am unable to see the path

 

Following is the code used for showing route:

 

 

var mapProp = {

center: new google.maps.LatLng(22.0824, 82.1411),

zoom: 15,

mapTypeId: google.maps.MapTypeId.ROADMAP

};

this.map = new google.maps.Map(this.gmapElement.nativeElement, mapProp);

this.directionsDisplay.setMap(this.map);

this.marker1 = new google.maps.Marker({

map: this.map,

draggable: true,

position: { lat: 22.0717, lng: 82.1497 }

});

this.marker2 = new google.maps.Marker({

map: this.map,

draggable: true,

position: { lat: 22.0942, lng: 82.1257 }

});

google.maps.event.addListener(this.marker1, 'position_changed', this.update);

google.maps.event.addListener(this.marker2, 'position_changed', this.update);

this.lat1 = 22.0717;

this.lang1 = 82.1497;

this.lat2 = 22.0942;

this.lang2 = 82.1257;

this.Source = new google.maps.LatLng(this.lat1, this.lang1);

this.Destination = new google.maps.LatLng(this.lat2, this.lang2);

this.calculateAndDisplayRoute(this.directionsService, this.directionsDisplay);

var request = {

origin: this.Source,

destination: this.Destination,

travelMode: google.maps.TravelMode.DRIVING

}

this.directionsService.route(request, function (response, status) {

if (status === google.maps.DirectionsStatus.OK) {

new google.maps.DirectionsRenderer().setDirections(response);

} else

{

window.alert('Directions request failed due to ' + status);

}

});

}

calculateAndDisplayRoute(directionsService, directionsDisplay) {

directionsService.route({

origin: this.Source,

destination: this.Destination,

travelMode: google.maps.TravelMode.DRIVING,

provideRouteAlternatives: true,

}, function (response, status) {

if (status === google.maps.DirectionsStatus.OK) {

directionsDisplay.setDirections(response);

}

else {

window.alert('Directions request failed due to ' + status);

}

});

}