Question

我一直在开源街景播放器（http://StreetViewPlayer.org），我有一个关于在新方向中添加新点的问题。

当用户添加新位置时，我需要知道用户是否已达到8个航路点限制。

有没有办法收到通知？

有人可以给我一些见解吗？

这是一个简单的代码来说明这一点（在达到8个航路点限制之前添加几个点）：

<!DOCTYPE html>
<html>
  <head>
    <title>Simple Map</title>
    <meta name="viewport" content="initial-scale=1.0">
    <meta charset="utf-8">
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      var map;
      function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {
          center: {lat: 35.694346, lng: -79.796409},
          zoom: 13
        });
        var directionsService = new google.maps.DirectionsService;
        var directionsDisplay = new google.maps.DirectionsRenderer({
          draggable: true,
          map: map
        });
        directionsDisplay.setMap(map);

        directionsService.route({
          origin:      {lat: 35.694346, lng: -79.796409},
          destination: {lat: 34.964737, lng: -80.060434},
          waypoints: [
            {location: {lat: 35.559346, lng: -80.089850}, stopover: true},
            {location: {lat: 35.356588, lng: -79.899915}, stopover: true},
          ],
          optimizeWaypoints: false,
          travelMode: google.maps.TravelMode.DRIVING
        }, function(response, status) {
          if (status === google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
          } else {
            window.alert('Directions request failed due to ' + status);
          }
        });
        function show( v ) {
            if ( v != undefined )
                console.log( "new waypoint is # " + v );
        }
        directionsDisplay.addListener('directions_changed', function() {
            var newDir = directionsDisplay.getDirections();
            console.log( newDir );
            show( newDir.request.Xc );
            show( newDir.request.Yc );
            show( newDir.request.Uc );
            show( newDir.request.Vc );
        });
      }
    </script>
    <script src="https://maps.googleapis.com/maps/api/js?callback=initMap"
    async defer></script>
  </body>
</html>

Answer 1

总点数（原点，目的地，加上任何航点）等于var map; function initMap() { map = new google.maps.Map(document.getElementById('map'), { center: { lat: 35.694346, lng: -79.796409 }, zoom: 13 }); var directionsService = new google.maps.DirectionsService; var directionsDisplay = new google.maps.DirectionsRenderer({ draggable: true, map: map }); directionsDisplay.setMap(map); directionsService.route({ origin: { lat: 35.694346, lng: -79.796409 }, destination: { lat: 34.964737, lng: -80.060434 }, waypoints: [{ location: { lat: 35.559346, lng: -80.089850 }, stopover: true }, { location: { lat: 35.356588, lng: -79.899915 }, stopover: true }, ], optimizeWaypoints: false, travelMode: google.maps.TravelMode.DRIVING }, function(response, status) { if (status === google.maps.DirectionsStatus.OK) { directionsDisplay.setDirections(response); } else { window.alert('Directions request failed due to ' + status); } }); function show(v) { if (v != undefined) console.log("new waypoint is # " + v); } directionsDisplay.addListener('directions_changed', function() { var newDir = directionsDisplay.getDirections(); document.getElementById('waypoints').innerHTML = newDir.geocoded_waypoints.length; console.log("there are " + (newDir.geocoded_waypoints.length - 2) + " waypoints"); console.log(newDir); show(newDir.request.Xc); show(newDir.request.Yc); show(newDir.request.Uc); show(newDir.request.Vc); }); } google.maps.event.addDomListener(window, "load", initMap);数组的长度。从中减去2以获得路线请求中的“航路点”数量。

代码段

html,
body,
#map {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="waypoints"></div>
<div id="map"></div>

if (email = /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i)

在向方向添加新点时，如何在用户达到8个航点限制时收到通知

1 个答案: