javascript - map 问题 : draw route with 2 coordinates

很抱歉，如果之前已经问过这个问题。我想加载带有 2 个标记的 map :起点和目的地。当建立 2 个标记时，我绘制了要遵循的路径(模式:驾驶)。

当我选择 2 个标记时，出现此错误:“Uncaught InvalidValueError: in property origin: not a string; and not a LatLng or LatLngLiteral: not an Object” 请帮我解决这个问题!

<html>
  <head>
    <title>Simple Map</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>

<script>
        var map;
        var cont=0;
        var directionsService = new google.maps.DirectionsService();
        function initialize() {
            var mapOptions = {
                zoom: 8,
                center: new google.maps.LatLng(-34.397, 150.644)
            };
        map = new google.maps.Map(document.getElementById('map-canvas'),mapOptions);

        google.maps.event.addListener(map, "click", daclick);


        function daclick(evento){
            //var cont=0;  
            if(cont==0){
                var latitudOrigen = evento.latLng.lat();
                var longitudOrigen = evento.latLng.lng();
                var myLatlngOrigen = new google.maps.LatLng(latitudOrigen,longitudOrigen);
                var markerOrigen = new google.maps.Marker({
                    position: myLatlngOrigen,
                    map: map,
                    title: "Origen"
  }); 
                cont=1;
            }else{
            var latitudDestino = evento.latLng.lat();
            var longitudDestino = evento.latLng.lng();
            var myLatlngDestino= new google.maps.LatLng(latitudDestino,longitudDestino);
            var markerDestino = new google.maps.Marker({
                    position: myLatlngDestino,
                    map: map,
                    title: "Destino"
  }); 
            cont=0;
      }

        var request = {
            origin:latitudOrigen,
            destination:myLatlngDestino,
            travelMode: google.maps.TravelMode.DRIVING
  };
  directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      directionsDisplay.setDirections(response);
    }
}); 

        }

    }
    google.maps.event.addDomListener(window, 'load', initialize);
    </script>
  </head>
  <body>
    <div id="map-canvas"></div>
  </body>
</html>

最佳答案

我收到此 javascript 错误 your code :未捕获的InvalidValueError:在属性来源中:不是字符串；而不是 LatLng 或 LatLngLiteral:不是对象。出于多种原因:

    var request = {
        origin: latitudOrigen,
        destination: myLatlngDestino,
        travelMode: google.maps.TravelMode.DRIVING
    };

latitudOrigen 不是 google.maps.LatLng 对象(它是一个数字，即原点的纬度)。
第二次点击时 myLatlngOrigen 超出范围

最简单的解决方法是使标记全局化，然后在运行路线服务时获取标记的位置:

        var request = {
            origin: markerOrigen.getPosition(),
            destination: markerDestino.getPosition(),
            travelMode: google.maps.TravelMode.DRIVING
        };

您还需要将 DirectionsService 的调用移至点击事件处理函数的 else 内，因为只有在您同时拥有起点和终点后，它才会起作用。

} else {
    var myLatlngDestino = evento.latLng;
    markerDestino = new google.maps.Marker({
        position: myLatlngDestino,
        map: map,
        title: "Destino"
    });
    var request = {
        origin: markerOrigen.getPosition(),
        destination: markerDestino.getPosition(),
        travelMode: google.maps.TravelMode.DRIVING
    };
    directionsService.route(request, function (response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
        }
    });
    cont = 0;
}

然后我得到:未捕获的ReferenceError:directionsDisplay未定义，因为您没有初始化directionsDisplay对象。

一旦我定义它就可以工作。

working fiddle

代码片段:

var map;
var cont = 0;
var directionsService = new google.maps.DirectionsService();
var markerOrigen = null;
var markerDestino = null;
var directionsDisplay = new google.maps.DirectionsRenderer();

function initialize() {
  var mapOptions = {
    zoom: 8,
    center: new google.maps.LatLng(-34.397, 150.644)
  };
  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
  directionsDisplay.setMap(map);

  google.maps.event.addListener(map, "click", daclick);


  function daclick(evento) {
    //var cont=0;  
    if (cont == 0) {
      var myLatlngOrigen = evento.latLng;
      markerOrigen = new google.maps.Marker({
        position: myLatlngOrigen,
        map: map,
        title: "Origen"
      });
      cont = 1;
    } else {
      var myLatlngDestino = evento.latLng;
      markerDestino = new google.maps.Marker({
        position: myLatlngDestino,
        map: map,
        title: "Destino"
      });
      var request = {
        origin: markerOrigen.getPosition(),
        destination: markerDestino.getPosition(),
        travelMode: google.maps.TravelMode.DRIVING
      };
      directionsService.route(request, function(response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
          directionsDisplay.setDirections(response);
        }
      });
      cont = 0;
    }
  }

}
google.maps.event.addDomListener(window, 'load', initialize);

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

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

关于javascript - map 问题 : draw route with 2 coordinates，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24622737/

javascript - map 问题 : draw route with 2 coordinates

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