Google Maps API中的推荐路线选项？ [英] Suggested Routes Option in Google Maps API?
问题描述
我有要求在来源和目的地之间显示多条路线。例如：如果我选择一个来源和目的地，我可以找到一条路线。但在谷歌地图，我们有一个建议的路线选项，这是我需要实现，但我失败了所有我的尝试。请找到下面的代码（例如，工作中显示源和目标之间的单一路由）。请指导如果我错过了什么。提前致谢
I have a requirement to show multiple routes between the source and destination. Eg: If i am selecting a source and destination i am able to find one single route. But as in google maps, we have a suggested routes option which the same i need to implement but i failed with all my tries. Please find the below code(Working eg. which shows single route between a source and destination). Please guide if i have missed something. Thanks in advance
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Chart</title>
<style>
html,body,#map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
#panel {
position: absolute;
top: 5px;
left: 50%;
margin-left: -180px;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
}
</style>
<script
src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script> var directionsDisplay; var directionsService = new google.maps.DirectionsService(); var map;
function initialize()
{
directionsDisplay = new google.maps.DirectionsRenderer();
var delhi = new google.maps.LatLng(28.6168, 77.2434);
var mapOptions =
{
zoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: delhi
}
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
directionsDisplay.setMap(map); } function calcRoute() {
var start = document.getElementById('start').value;
var end = document.getElementById('end').value;
var waypts = [];
var checkboxArray = document.getElementById('waypoints');
for (var i = 0; i < checkboxArray.length; i++)
{ if (checkboxArray.options[i].selected == true)
{
waypts.push({
location:checkboxArray[i].value,
stopover:true});
}
}
var request =
{
origin: start,
destination: end,
waypoints: waypts,
optimizeWaypoints: true,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request, function(response, status)
{
if (status == google.maps.DirectionsStatus.OK)
{
directionsDisplay.setDirections(response);
var route = response.routes[0];
var summaryPanel = document.getElementById('directions_panel');
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 + '<br><br>';
}
} });
} google.maps.event.addDomListener(window, 'load', initialize); </script>
</head>
<body>
<div id="map-canvas" style="float: left; width: 70%; height: 100%;"></div>
<div id="control_panel"
style="float: right; width: 30%; text-align: left; padding-top: 20px">
<div style="margin: 20px; border-width: 2px;"><b>Loco Journey Start Station:</b> <select
id="start">
<option value="Tughlakabad">Panvel</option>
<option value="Lucknow">Lucknow</option>
<option value="Firozpur">Firozpur</option>
<option value="Ghaziabad">Ghaziabad</option>
</select> <br>
<b>Journey:</b> <br>
<i>(Ctrl-Click for multiple selection)</i> <br>
<select multiple id="waypoints">
<option value="Bhopal">Bhopal</input>
<option value="Raipur">Raipur</input>
<option value="Farukkhabad">Farukkhabad</input>
<option value="Jhansi">Jhansi</input>
</select> <br>
<b>Loco Journey End Station:</b> <select id="end">
<option value="Lucknow">Lucknow</option>
<option value="Firozpur">Firozpur</option>
<option value="Ghaziabad">Ghaziabad</option>
<option value="Tughlakabad">Tughlakabad</option>
</select> <br>
<input type="submit" onclick="calcRoute();"></div>
<div id="directions_panel"
style="margin: 20px; background-color: #FFEE77;"></div>
</div>
</body>
</html>
推荐答案
当设置为true时，provideRouteAlternatives（可选）指定路线服务可以在响应中提供多个
路线替代方案。请注意，提供路由选择可能会增加
服务器的响应时间。
provideRouteAlternatives (optional) when set to true specifies that the Directions service may provide more than one route alternative in the response. Note that providing route alternatives may increase the response time from the server.
example
var request = {
origin: start,
destination: end,
travelMode: google.maps.DirectionsTravelMode.DRIVING,
provideRouteAlternatives: true
};
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