在Google Maps API v3中显示多个标记和方向变量的infoWindows问题

Issue with infoWindows with multiple markers and directionsDisplay variables in Google Maps API v3

本文关键字：方向 变量 问题 infoWindows API Maps Google v3 显示      更新时间：2023-09-26

我试图显示谷歌地图API v3中两个标记之间的距离和分钟数，并使用这些信息来覆盖directionsService被触发时出现的默认infoWindow文本，我认为calcRoute()和infoWindows存在异步问题。这是一个重现错误的示例代码。

<html>
<head>
    <meta charset='utf-8'>
    <script src="http://maps.google.com/maps/api/js?sensor=true" type="text/javascript"></script>
    <script>
        var directionsDisplay = new google.maps.DirectionsRenderer({ 'map': map }); 
        var directionsService = new google.maps.DirectionsService();
        var map;
        function initMap(locations){
            function calcRoute(latdest, lngdest) {
                var start = new google.maps.LatLng(-23.571064, -46.645424);
                var end = new google.maps.LatLng(latdest, lngdest)
                var request = {origin:start,destination:end,travelMode: google.maps.TravelMode.DRIVING};
                directionsService.route(request, function(result, status){
                    if (status == google.maps.DirectionsStatus.OK){
                        directionsDisplay.setDirections(result);
                    }
                });
            }
            map = new google.maps.Map(document.getElementById('mapcanvas'), {zoom: 10,center: new google.maps.LatLng(-23.571064, -46.645424),mapTypeId: google.maps.MapTypeId.ROADMAP
            });
            directionsDisplay.setMap(map);
            var infowindow = new google.maps.InfoWindow();
            var marker, i;
            var image = null;
            for (i = 0; i < locations.length; i++) {
              marker = new google.maps.Marker({
                position: new google.maps.LatLng(locations[i][1], locations[i][2]),
                map: map
              });
              google.maps.event.addListener(marker, 'click', (function(marker, i) {
                return function() {
                    calcRoute(locations[i][1], locations[i][2]);
                    infowindow.setContent(directionsDisplay.directions.routes[0].legs[0].distance.text+" - "+directionsDisplay.directions.routes[0].legs[0].duration.text);
                    infowindow.open(map, marker);
                }
              })(marker, i));
            }
        }
    </script>
</head>
<body onload='initMap([["Vila Noemia", -23.670237, -46.467286],["Osasco", -23.535465, -46.794234],["Guarulhos", -23.458911, -46.526912]]);'>
    <div id="mapcanvas" style="width:100%;height:100%;">
    </div>
</body>

请注意，如果单击一个标记，然后单击另一个标记，第二个标记将显示所需的结果，但该信息属于第一个标记…我如何强制执行的顺序，以避免异步?

您需要在DirectionsService回调函数中打开可用数据的信息窗口。

(您可能还想从方向服务中抑制现有标记)

InfoWindow单击listener:

    google.maps.event.addListener(marker, 'click', (function (marker, i) {
        return function () {
            calcRoute(locations[i][1], locations[i][2]);
            infowindow.open(map, marker);
        }
    })(marker, i));

更新calcRoute功能:

function calcRoute(latdest, lngdest) {
    var start = new google.maps.LatLng(-23.571064, -46.645424);
    var end = new google.maps.LatLng(latdest, lngdest)
    var request = {
        origin: start,
        destination: end,
        travelMode: google.maps.TravelMode.DRIVING
    };
    directionsService.route(request, function (result, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(result);
            infowindow.setContent(directionsDisplay.directions.routes[0].legs[0].distance.text + " - " + directionsDisplay.directions.routes[0].legs[0].duration.text);
        }
    });
}

概念验证

代码片段:

var directionsDisplay = new google.maps.DirectionsRenderer({
  map: map,
  suppressMarkers: true
});
var directionsService = new google.maps.DirectionsService();
var map;
var infowindow = new google.maps.InfoWindow();
function initMap(locations) {
  function calcRoute(latdest, lngdest) {
    var start = new google.maps.LatLng(-23.571064, -46.645424);
    var end = new google.maps.LatLng(latdest, lngdest)
    var request = {
      origin: start,
      destination: end,
      travelMode: google.maps.TravelMode.DRIVING
    };
    directionsService.route(request, function(result, status) {
      if (status == google.maps.DirectionsStatus.OK) {
        directionsDisplay.setDirections(result);
        infowindow.setContent(directionsDisplay.directions.routes[0].legs[0].distance.text + " - " + directionsDisplay.directions.routes[0].legs[0].duration.text);
      }
    });
  }
  map = new google.maps.Map(document.getElementById('mapcanvas'), {
    zoom: 10,
    center: new google.maps.LatLng(-23.571064, -46.645424),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });
  directionsDisplay.setMap(map);
  var marker, i;
  var image = null;
  for (i = 0; i < locations.length; i++) {
    marker = new google.maps.Marker({
      position: new google.maps.LatLng(locations[i][1], locations[i][2]),
      map: map
    });
    google.maps.event.addListener(marker, 'click', (function(marker, i) {
      return function() {
        calcRoute(locations[i][1], locations[i][2]);
        infowindow.open(map, marker);
      }
    })(marker, i));
  }
}
google.maps.event.addDomListener(window, 'load', function() {
  initMap([
    ["Vila Noemia", -23.670237, -46.467286],
    ["Osasco", -23.535465, -46.794234],
    ["Guarulhos", -23.458911, -46.526912]
  ]);
});
html,
body,
#map_canvas {
  height: 500px;
  width: 500px;
  margin: 0px;
  padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="mapcanvas" style="width:100%;height:100%;"></div>

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