问题描述
我已经成功实现了google map direction服务api: https://developers.启用了可拖曳"选项的google.com/maps/documentation/javascript/路线.如果两个地点之间有多条路线可用，是否可以同时显示所有路线?
I've successfully implemented google map direction service api : https://developers.google.com/maps/documentation/javascript/directions with 'draggble' option enabled. Is it possible to show all routes together if multiple routes are available between 2 locations?
当前代码类似于: https://developers. google.com/maps/documentation/javascript/examples/directions-draggable ，并且启用了provideRouteAlternatives: true后，我的响应代码中确实有其他路由可用.
The current code is similar to: https://developers.google.com/maps/documentation/javascript/examples/directions-draggable and I do have alternative routes available in response code as I've enabled provideRouteAlternatives: true.
我尝试了以下解决方案:如何显示替代项使用Google Map API进行路由.但是，当我使用该代码时，我发现它使用独立的标记绘制了多条路线.也就是说，如果有4条路线，将有4个"A"位置和4个"B"位置，并且在拖动时-仅选择其中一个.请找到以下屏幕截图.
I tried the solution provided in : How to display alternative route using google map api. But when I used that code, I found it draws multiple routes with independent markers. That is, if 4 routes are available, there will be 4 'A' locations and 4 'B' locations and while dragging - only one of them get selected. Please find the below screenshots.
我需要以这样一种方式进行拖动:当拖动位置A或B时，不应有任何重复，并且应自动显示备用路线.
I need to drag in such a way that, when the location A or B is dragged, there should not be any duplicates and alternate routes should be automatically shown.
我当前的代码如下(此处未添加API密钥):
My current code is as follows (API key not added here):
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Draggable directions</title>
<style>
#right-panel {
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}
#right-panel select, #right-panel input {
font-size: 15px;
}
#right-panel select {
width: 100%;
}
#right-panel i {
font-size: 12px;
}
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
float: left;
width: 63%;
height: 100%;
}
#right-panel {
float: right;
width: 34%;
height: 100%;
}
.panel {
height: 100%;
overflow: auto;
}
</style>
</head>
<body>
<div id="map"></div>
<div id="right-panel">
<p>Total Distance: <span id="total"></span></p>
</div>
<script>
var map;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {lat: -24.345, lng: 134.46} // Australia.
});
var directionsService = new google.maps.DirectionsService;
var directionsDisplay = new google.maps.DirectionsRenderer({
draggable: true,
map: map,
panel: document.getElementById('right-panel')
});
directionsDisplay.addListener('directions_changed', function() {
computeTotalDistance(directionsDisplay.getDirections());
});
displayRoute('Rosedale, MD, USA', 'Savage, MD, USA', directionsService,
directionsDisplay);
}
function displayRoute(origin, destination, service, display) {
service.route({
origin: origin,
destination: destination,
travelMode: 'DRIVING',
avoidTolls: true,
provideRouteAlternatives: true,
}, function(response, status) {
if (status === 'OK') {
for (var i = 0, len = response.routes.length; i < len; i++) {
new google.maps.DirectionsRenderer({
map: map,
directions: response,
routeIndex: i,
draggable : true,
});
}
display.setDirections(response);
} else {
alert('Could not display directions due to: ' + status);
}
});
}
function computeTotalDistance(result) {
var total = 0;
var myroute = result.routes[0];
for (var i = 0; i < myroute.legs.length; i++) {
total += myroute.legs[i].distance.value;
}
total = total / 1000;
document.getElementById('total').innerHTML = total + ' km';
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=API-KEY&callback=initMap">
</script>
</body>
</html>
请帮助我.预先感谢！
推荐答案
您绘制的每条路线都是可编辑的，并且具有起点和终点标记，这意味着您将始终拖动其中一条路线标记并非一次全部.您可以使用suppressMarkers选项从替代路线中删除标记，但这不会对行为产生太大影响.
Each route you draw is editable and has a start and end marker which means that you will always be dragging one of the routes marker and not all at once. You could use the suppressMarkers option to remove markers from the alternate routes but that wouldn't change a lot to the behavior.
问题在于，由于每条路线都是分开的，因此如果移动起点或终点位置，则应重绘每条路线，否则只有一条会更新.
The problem is that as each route is separate, if you move the start or end location, you should redraw every route otherwise only one will update.
也就是说，如果您编辑路线(而不是更改起点或终点位置)，则不应重绘路线.如果您更新起点或终点位置，那么您当然会丢失添加的所有路线航点.除非您对此采取任何措施...听起来像是一种痛苦.
That said, if you edit a route (other than by changing its start or end location) you should not redraw your routes. If you update the start or end location you will of course then lose any route waypoint you added. Unless you do something about that... which sounds like a pain.
var directionsService = new google.maps.DirectionsService();
var map;
function initialize() {
var center = new google.maps.LatLng(0, 0);
var myOptions = {
zoom: 7,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: center
}
map = new google.maps.Map(document.getElementById("map-canvas"), myOptions);
var start = "Sadulpur, India";
var end = "New Delhi, India";
plotDirections(start, end);
}
function plotDirections(start, end) {
var method = 'DRIVING';
var request = {
origin: start,
destination: end,
travelMode: google.maps.DirectionsTravelMode[method],
provideRouteAlternatives: true
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
var routes = response.routes;
var colors = ['red', 'green', 'blue', 'orange', 'yellow', 'black'];
var directionsDisplays = [];
// Reset the start and end variables to the actual coordinates
start = response.routes[0].legs[0].start_location;
end = response.routes[0].legs[0].end_location;
// Loop through each route
for (var i = 0; i < routes.length; i++) {
var directionsDisplay = new google.maps.DirectionsRenderer({
map: map,
directions: response,
routeIndex: i,
draggable: true,
polylineOptions: {
strokeColor: colors[i],
strokeWeight: 4,
strokeOpacity: .3
}
});
// Push the current renderer to an array
directionsDisplays.push(directionsDisplay);
// Listen for the directions_changed event for each route
google.maps.event.addListener(directionsDisplay, 'directions_changed', (function(directionsDisplay, i) {
return function() {
var directions = directionsDisplay.getDirections();
var new_start = directions.routes[0].legs[0].start_location;
var new_end = directions.routes[0].legs[0].end_location;
if ((new_start.toString() !== start.toString()) || (new_end.toString() !== end.toString())) {
// Remove every route from map
for (var j = 0; j < directionsDisplays.length; j++) {
directionsDisplays[j].setMap(null);
}
// Redraw routes with new start/end coordinates
plotDirections(new_start, new_end);
}
}
})(directionsDisplay, i)); // End listener
} // End route loop
}
});
}
initialize();#map-canvas {
height: 180px;
}<div id="map-canvas"></div>
<script src="https://maps.googleapis.com/maps/api/js?key= AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>这篇关于Google Maps API v3-带有可拖动替代路线的路线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！