【发布时间】:2015-11-10 16:21:54
【问题描述】:
我正在尝试显示 Google Maps API v3 中两个标记之间的距离和分钟数,并使用这些信息覆盖在触发 directionsService 时出现的默认 infoWindow 文本,我认为存在异步问题与calcRoute() 和infoWindows。这是重现错误的示例代码。
<html>
<head>
<meta charset='utf-8'>
<script src="http://maps.google.com/maps/api/js?sensor=true" type="text/javascript"></script>
<script>
var directionsDisplay = new google.maps.DirectionsRenderer({ 'map': map });
var directionsService = new google.maps.DirectionsService();
var map;
function initMap(locations){
function calcRoute(latdest, lngdest) {
var start = new google.maps.LatLng(-23.571064, -46.645424);
var end = new google.maps.LatLng(latdest, lngdest)
var request = {origin:start,destination:end,travelMode: google.maps.TravelMode.DRIVING};
directionsService.route(request, function(result, status){
if (status == google.maps.DirectionsStatus.OK){
directionsDisplay.setDirections(result);
}
});
}
map = new google.maps.Map(document.getElementById('mapcanvas'), {zoom: 10,center: new google.maps.LatLng(-23.571064, -46.645424),mapTypeId: google.maps.MapTypeId.ROADMAP
});
directionsDisplay.setMap(map);
var infowindow = new google.maps.InfoWindow();
var marker, i;
var image = null;
for (i = 0; i < locations.length; i++) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
map: map
});
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
calcRoute(locations[i][1], locations[i][2]);
infowindow.setContent(directionsDisplay.directions.routes[0].legs[0].distance.text+" - "+directionsDisplay.directions.routes[0].legs[0].duration.text);
infowindow.open(map, marker);
}
})(marker, i));
}
}
</script>
</head>
<body onload='initMap([["Vila Noemia", -23.670237, -46.467286],["Osasco", -23.535465, -46.794234],["Guarulhos", -23.458911, -46.526912]]);'>
<div id="mapcanvas" style="width:100%;height:100%;">
</div>
</body>
请注意,如果您单击一个标记,然后单击另一个,第二个标记将显示所需的结果,但该信息属于第一个标记...如何强制执行顺序以避免异步?
提前谢谢...
【问题讨论】:
-
我曾尝试使用
callbacks、$.deferreds和$.when,但这些都对我不起作用,尽管我不能 100% 确定我实施得很好......跨度>
标签: javascript google-maps google-maps-api-3 google-maps-markers infowindow