我＆＃39;有这个问题，当我加载我的页面并插入Origin和Destination后，点击按钮＆＃34;找到＆＃34;它没有在谷歌地图中显示任何内容，因为它说响应不是一个对象，所以我试图用console.log标记它，它说Response = null，但如果我重新加载页面并快速点击定位，然后它绘制路线。
这是代码
function init(){
var latlng = new google.maps.LatLng(40.635636, 17.942414);
var mapOptions = { zoom: 12, center: latlng };
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
}
function updateMap(){
init();
var originGeocoder = new google.maps.Geocoder();
var destinationGeocoder = new google.maps.Geocoder();
var origin = document.getElementById( "origin" ).value + " Brindisi 72100";
var destination = document.getElementById( "destination" ).value + " Brindisi 72100";
var directionsService2 = new google.maps.DirectionsService();
originGeocoder.geocode( { 'address': origin }, function(results, status) {
if ( status == google.maps.GeocoderStatus.OK ) {
var startLatLng = results[0].geometry.location;
var oLat = startLatLng.lat();
var oLng = startLatLng.lng();
document.getElementById('cStart').innerHTML = oLat + " " + oLng;
}
else{
alert("Geocode was not successful for the following reason: " + status);
}
});
//Chiamata asincrona alle API per ottenere Lat e Lng dell' indirizzo di destinazione
destinationGeocoder.geocode( { 'address': destination }, function(results, status) {
if ( status == google.maps.GeocoderStatus.OK ) {
var destLatLng = results[0].geometry.location;
var dLat = destLatLng.lat();
var dLng = destLatLng.lng();
document.getElementById('cDestination').innerHTML = typeof dLat;
document.getElementById('cDestination').innerHTML = dLat + " " + dLng;
}
else{
alert("Geocode was not successful for the following reason: " + status);
}
});
//Salva in req[] le varie distanze tra le paline e la destinazione
singleObjToStop(origin,destination,function(paline,req,reqO){
console.log("1");
//Trova la palina più vicina alla destinazione
calcSingleDis(paline,req,reqO,function(w2,w1){
console.log("2");
//Disegna i waypoints(?)
reqEnd(origin,destination,w1,w2,function(request){
console.log("3");
directionsService2.route(request, function(response, status) {
console.log("4");
console.log(response);
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
var route = response.routes[0];
var summaryPanel = document.getElementById("distance");
summaryPanel.innerHTML = "";
// For each route, display summary information.
for (var i = 0; i < route.legs.length; i++) {
var routeSegment = i + 1;
summaryPanel.innerHTML += "<b>Route Segment: " + routeSegment + "</b><br />";
summaryPanel.innerHTML += route.legs[i].start_address + " to ";
summaryPanel.innerHTML += route.legs[i].end_address + "<br />";
summaryPanel.innerHTML += route.legs[i].distance.text + " ";
summaryPanel.innerHTML += route.legs[i].duration.text + "<br /><br />" ;
}
computeTotalDistance(response);
}
else{
console.log("ENTRA QUA STRONZO");
console.log("Fermata partenza = " + w1);
console.log("Fermata arrivo = " + w2);
}
});
directionsDisplay.setMap(map);
});
});
});
}
function singleObjToStop(origin,destination,callback){
var data=<?php echo $data; ?>;
var a,b,i=0;
var paline = new Array();
var req = new Array();
var reqO = new Array();
var num = <?php echo $n; ?>;
$.each(data, function(fieldName, fieldValue) {
a=fieldValue.geoLat;
b=fieldValue.geoLong;
a=parseFloat(a);
b=parseFloat(b);
paline[i]=new google.maps.LatLng(a,b);
req[i] = {
origin:paline[i],
destination:destination,
travelMode: google.maps.TravelMode.WALKING
};
reqO[i] = {
origin:origin,
destination:paline[i],
travelMode: google.maps.TravelMode.WALKING
};
i++;
if(i==num){
callback(paline,req,reqO);
}
});
}
function calcSingleDis(paline, req, reqO, callback) {
var directionsService = new google.maps.DirectionsService();
var c = 10000000;
var w2 = new google.maps.LatLng(0, 0);
var w1 = new google.maps.LatLng(0, 0);
var num = <?php echo $n; ?>;
var j = (num - 1);
var t;
var cO = 10000000;
var numO = <?php echo $n; ?>;
var jO = 0;
for (j = 0; j < num; j++) {
t = 0;
directionsService.route(req[j], function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
//directionsDisplay.setDirections(response);
var troute = response.routes[0];
var dis = parseFloat((troute.legs[0].distance.text).replace(",", "."));
document.getElementById('test').innerHTML = dis;
//se distanza minore di quella minore trovata fin ora la cambia
if (dis < c) {
w2 = paline[j - num];
c = dis;
}
if (t == (num - 1)) {
console.log("QUA ENTRA LOL");
for (jO = 0; jO < numO; jO++) {
console.log("E NON ENTRA MANNAC");
t = 0;
directionsService.route(reqO[jO], function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
console.log("E NON ENTRA MANNAC22222");
//directionsDisplay.setDirections(response);
var troute = response.routes[0];
var disO = parseFloat((troute.legs[0].distance.text).replace(",", "."));
document.getElementById('test').innerHTML = dis;
//se distanza minore di quella minore trovata fin ora la cambia
if (disO < cO) {
w1 = paline[jO - numO];
cO = disO;
}
if (t == (numO - 1)) {
console.log("W1 = " + w1);
console.log(response);
callback(w2, w1);
}
}
jO++;
t++;
});
}
}
}
j++;
t++;
});
}
}
function reqEnd(origin,destination,w1,w2,callback){
var request = {
origin:origin,
destination:destination,
waypoints: [{location: w1} , {location: w2}],
//waypoints: [{location: w2}],
optimizeWaypoints: true,
travelMode: google.maps.DirectionsTravelMode.WALKING
};
callback(request);
}
function computeTotalDistance(result) {
var totalDist = 0;
var totalTime = 0;
var myroute = result.routes[0];
for (i = 0; i < myroute.legs.length; i++) {
totalDist += myroute.legs[i].distance.value;
totalTime += myroute.legs[i].duration.value;
}
totalDist = totalDist / 1000.
document.getElementById("total").innerHTML = "total distance is: "+ totalDist + " km<br>total time is: " + (totalTime / 60).toFixed(2) + " minutes";
}
google.maps.event.addDomListener( window, 'load', init );
答案 0 :(得分：3)
此问题与您可以在Google Maps API v3中使用的查询限制有关。 你可以看看这里：https://developers.google.com/maps/documentation/business/faq#google_maps_api_services
您可能会使用您的程序向API发出大量请求，而您可以从Google问答处看到限制性限制。
应用程序应该限制请求以避免超出使用限制， 请记住，这些适用于每个客户ID，无论多少 发送请求的IP地址。
您可以通过将请求置于保留的队列中来限制请求 跟踪何时发送请求。使用速率限制或10 QPS（查询 每秒），在发送第11个请求时，您的应用程序应该检查 第一个请求的时间戳，等待1秒钟过去。 这应该适用于每日限制。
即使正确实施了限制，应用程序也应该关注 out用于状态代码为OVER_QUERY_LIMIT的响应。如果这样的回应 收到后，使用Usage中说明的pause-and-retry机制 限制超出上述部分以检测已超出哪个限制。
你会发现有用的：How do I Geocode 20 addresses without receiving an OVER_QUERY_LIMIT response?
答案 1 :(得分：0)
Google Maps API提供了一个地理编码器类，用于从用户输入动态地进行地理编码和反向地理编码。 read more检查地理位置demo here以及更多HTML5地理位置check here