I'm not sure I follow what you expect to happen and what is happening
when provideTripAlternatives is true.
Here is a demo I have with a directions request when
provideTripAlternatives is true. The renderer shows the first trip on
the map and a selectable trip list that changes the trip on the map
when a different trip is selected. If I wanted to change the trip
manually I could call DirectionsRenderer.setTripList().
var map = new google.maps.Map(document.getElementById("map"));
map.setMapTypeId(google.maps.MapTypeId.ROADMAP);
var directionsService = new google.maps.DirectionsService;
var directionsRenderer = new google.maps.DirectionsRenderer({
map: map, panel: document.getElementById("directions")});
directionsService.route({
origin: "Sydney",
destination: "Brisbane",
provideTripAlternatives:true,
travelMode: google.maps.DirectionsTravelMode.DRIVING
}, function(result, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsRenderer.setDirections(result);
}
});
Hope this helps,
Susannah
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