javascript - Remove previous Directions Route Google Maps -


hi, trying plan route info window, unable remove previous set route. tried setmap(null) didn't work. using callback event listener need pass parameter returned api call. 1 option use new google.maps.map on each event e.g (link) on marker markers placed when page loads. 

element = document.getelementbyid('map-canvas'); map = new google.maps.map(element, options); var marker = new google.maps.marker({     position: new google.maps.latlng(car.lat, car.long),     map: map,     title: car.make }); google.maps.event.addlistener(marker, 'click', directionscallback(car)); function directionscallback(car) {     return function (e) {         if( infowindow != null ) {             infowindow.close();         }         var directionsservice = new google.maps.directionsservice();         directionsdisplay = new google.maps.directionsrenderer();         directionsdisplay.setmap(null);         console.log(directionsdisplay);         calcroute = function(){             var startpoint = document.getelementbyid('clientaddress').value;             var finishpoint = new google.maps.latlng(car.lat, car.long);             var request = {                 origin: startpoint,                 destination: finishpoint,                 travelmode: google.maps.travelmode.driving             };             directionsservice.route(request, function (response, status) {                 if (status == google.maps.directionsstatus.ok) {                     directionsdisplay.setmap(map);                     directionsdisplay.setdirections(response);                     console.log(directionsdisplay)                     console.log(response.routes.length)                     infowindow.close();                 }                 else{                     alert('sorry ! ' + givenaddress + ' not recognized')                 }             });         }         infowindow = new google.maps.infowindow();         infowindow.setcontent("\n"             + 'directions here : <input id = \'clientaddress\'       placeholder=\"postcode or city\" type=\'text\'>'             + ' <input type=\'button\' onclick=calcroute() value=\'go!\'>')         infowindow.open(map, this);       } }

define directionsdisplay 1 time(outside of click-handler)


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