我的问题是,数组本身被正确地显示,而单个元素则被放置为“未定义”。
//Controller für die Map und ihre Funktionen
mapApp.controller('MapCtrl', function($scope, $ionicLoading, dataService) {
//Funktion zur Geocodierung von Adressen Eingabe String
var geocodeAddress = function(geocoder, resultsMap) {
//Hole Textfeld Input aus Service
var address = dataService.getAddress();
//Geocode Funktion analog zu Google Maps API Beispiel
geocoder.geocode({'address' : address}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
resultsMap.setCenter(results[0].geometry.location);
resultsMap.setZoom(14);
dataService.setLatLng(results[0].geometry.location.lat(), results[0].geometry.location.lng());
var marker = new google.maps.Marker({
map: resultsMap,
position: results[0].geometry.location,
});
//onClick Info Fenster mit Adresse
var infoString = "Dein Startpunkt: <br>" + results[0].formatted_address;
var infoWindow = new google.maps.InfoWindow({
content: infoString
});
marker.addListener("click", function() {
infoWindow.open(resultsMap, marker);
});
}
else {
alert("Ups, da ist etwas schief gegangen ! Error: " + status);
}
});
}
//Funktion zur Initialisierung der Map
//inklusive Geocoding und Erreichbarkeitspolygonen
var initialize = function() {
//Route360° stuff
r360.config.serviceKey = 'KADLJY0DAVQUDEZMYYIM';
r360.config.serviceUrl = 'https://service.route360.net/germany/';
var myLatlng = new google.maps.LatLng(48.383, 10.883);
var mapOptions = {
center: myLatlng,
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map"), mapOptions);
var geocoder = new google.maps.Geocoder();
var p = new Promise(function (resolve, reject) {
geocodeAddress(geocoder, map);
if(dataService.getLatLng()) {
resolve("Success!");
}
else {
reject("Failure!");
}
});
//console.log(dataService.getLatLng());
p.then(function() {
//console.log(dataService.getLatLng());
var coords = dataService.getLatLng();
console.log(coords);
console.log(coords[0]);
console.log(JSON.stringify(coords, null, 4));
var time = dataService.getTime();
var move = dataService.getMove();
var colorPolygonLayer = new GoogleMapsPolygonLayer(map);
showPolygons(48.4010822, 9.987607600000047, colorPolygonLayer, time, move);
});
$scope.map = map;
}
ionic.Platform.ready(initialize);
});
//Funtkion zum Erstellen und Anzeigen der Erreichbarkeitspolygone
var showPolygons = function(lat, lng, polygonLayer, time, move) {
//Setzen der Optionen für die Berechnung der Polygone
var travelOptions = r360.travelOptions();
//Lat-Lng bestimmen
travelOptions.addSource({ lat : lat, lng : lng });
//Zeitintervalle bestimmen
travelOptions.setTravelTimes(time*60);
//Fortbewegungsmittel bestimmen
travelOptions.setTravelType(move);
r360.PolygonService.getTravelTimePolygons(travelOptions, function(polygons) {
polygonLayer.update(polygons);
});
}
//Controller für die Daten
//Eigentlich nur Daten in Service schreiben onClick
mapApp.controller("DataCtrl", function($scope, dataService) {
$scope.setData = function() {
var address = document.getElementById("address").value;
var time = document.getElementById("time").value;
var move = $scope.move;
dataService.setData(address,time,move);
};
});
//Service um Daten zwischen Controllern zu benutzen
mapApp.service("dataService", function() {
var address;
var time;
var move;
var latlng = [];
//Adresse, Zeit und Fortbewegungsmittel setzen
this.setData = function(passed_address, passed_time, passed_move) {
address = passed_address;
time = passed_time;
move = passed_move
};
this.setLatLng = function (lat, lng) {
latlng.push(lat);
latlng.push(lng);
};
//Getter
this.getAddress = function() {
return address;
};
this.getTime = function() {
return time;
};
this.getMove = function () {
return move;
};
this.getLatLng = function(){
return latlng;
}
})
我的代码示例中的特定行是:
console.log(coords);
console.log(coords[0]);
console.log(JSON.stringify(coords, null, 4));
这些是我的返回值。
就像我说的那样,console.log(coords) 打印出了正确的数组,但如果我想调用 console.log(coords[0]) ,它会返回 "undefined"(与 console.log(JSON.stringify(coords,null,4)); 相同)
有人可以解释一下这个问题,或者(更好的是)给出一个解决方案吗?
@Jason Cust 建议后编辑:
var arr = [];
var p = new Promise(function (resolve, reject) {
geocodeAddress(geocoder, map);
asyncPush(arr, dataService.getLatLng(), resolve);
});
p.then(function() {
var a = getArr();
console.log(a);
console.log(a[0]);
var time = dataService.getTime();
var move = dataService.getMove();
var colorPolygonLayer = new GoogleMapsPolygonLayer(map);
showPolygons(48.4010822, 9.987607600000047, colorPolygonLayer, time, move);
});
function asyncPush(a, val, cb) {
setTimeout(function() {
a.push(val);
cb();
} , 0);
}
function getArr() {return arr; }
这是结果:
由于每个坐标再次未定义,我无法为每个坐标使用asyncPush,因此我将整个arr数组添加到var a中,现在它是一个数组中的数组,看起来似乎可以工作。当然,我可以构建一个解决方法,将三维数组保存在二维数组中,但是这就是您想要做的吗?
编辑:尝试将三维数组保存到二维数组中会再次返回未定义的变量
解决方案编辑:所以我最终通过遵循有关承诺的教程来解决我的问题:http://exploringjs.com/es6/ch_promises.html
诀窍是使用承诺包装geocodeAddress函数,并在我的initialize函数中调用承诺上的.then函数,以使两个函数按顺序调用。这是我的代码:
var geocodeAddress = function(geocoder, resultsMap) {
return new Promise(function(resolve, reject) {
//Hole Textfeld Input aus Service
var address = dataService.getAddress();
//Geocode Funktion analog zu Google Maps API Beispiel
geocoder.geocode({'address' : address}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
resultsMap.setCenter(results[0].geometry.location);
resultsMap.setZoom(14);
dataService.setLatLng(results[0].geometry.location.lat(), results[0].geometry.location.lng());
var marker = new google.maps.Marker({
map: resultsMap,
position: results[0].geometry.location,
});
//onClick Info Fenster mit Adresse
var infoString = "Dein Startpunkt: <br>" + results[0].formatted_address;
var infoWindow = new google.maps.InfoWindow({
content: infoString
});
marker.addListener("click", function() {
infoWindow.open(resultsMap, marker);
});
}
if(dataService.getLatLng()) {
resolve("Success");
}
else {
alert("Ups, da ist etwas schief gegangen ! Error: " + status);
reject("Failed");
}
});
});
}
//Funktion zur Initialisierung der Map
//inklusive Geocoding und Erreichbarkeitspolygonen
var initialize = function() {
//Route360° stuff
r360.config.serviceKey = 'KADLJY0DAVQUDEZMYYIM';
r360.config.serviceUrl = 'https://service.route360.net/germany/';
var myLatlng = new google.maps.LatLng(48.383, 10.883);
var mapOptions = {
center: myLatlng,
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map"), mapOptions);
var geocoder = new google.maps.Geocoder();
geocodeAddress(geocoder, map)
.then(function() {
var coords = dataService.getLatLng();
var time = dataService.getTime();
var move = dataService.getMove();
var colorPolygonLayer = new GoogleMapsPolygonLayer(map);
showPolygons(coords[0], coords[1], colorPolygonLayer, time, move);
});
$scope.map = map;
}
ionic.Platform.ready(initialize);
});
无论如何,非常感谢 @Jason Cust 的帮助,在没有太多 JS 知识的情况下寻找解决方案让我头痛不已。
敬礼, Julian
getLatLng
是异步的,有时坐标还没有返回。 - BrTkCagetLatLng
的完整响应,我们无法帮助您。 - BrTkCa