我编写了一个应用程序，用户可以使用Google地方API自动完成输入源和目的地，他也可以进入中间位置。我只是想确定这个中间地点是否来自源头和目的地。
这段代码一直工作到上周。不确定是什么问题。
这是我的代码：
<html>
<head>
<style type="text/css">
body {
font-family: sans-serif;
font-size: 14px;
}
</style>
<title>Pillion Search Engine</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<script src="http://maps.googleapis.com/maps/api/js?sensor=false&libraries=places,geometry" type="text/javascript"></script>
<script type="text/javascript">
var locations = new Array();
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
//calculates distance between two points in km's
function calcDistance(p1, p2){
return (google.maps.geometry.spherical.computeDistanceBetween(p1, p2) / 1000).toFixed(2);
}
function initialize() {
alert("Inside Initialize");
var UserSource = document.getElementById('searchTextFieldSource');
var UserDestination = document.getElementById('searchTextFieldDestination');
var DbSource = document.getElementById('searchTextFieldIntermediateSource');
var DbDestination = document.getElementById('searchTextFieldIntermediateDestination');
var ACUserSource = new google.maps.places.Autocomplete(UserSource);
var ACUserDestination = new google.maps.places.Autocomplete(UserDestination);
var ACDbSource = new google.maps.places.Autocomplete(DbSource);
var ACDbDestination = new google.maps.places.Autocomplete(DbDestination);
google.maps.event.addListener(ACDbDestination, 'place_changed', function () {
var place1 = ACUserSource.getPlace();
document.getElementById('city1').value = place1.name;
var place1Lat = place1.geometry.location.lat();
var place1Lng = place1.geometry.location.lng();
document.getElementById('cityLat1').value = place1Lat;
document.getElementById('cityLng1').value = place1Lng;
var obj = new Object();
obj.city = place1.name;
obj.latitude = place1.geometry.location.lat();
obj.longitude = place1.geometry.location.lng();
locations.push(obj);
var place2 = ACUserDestination.getPlace();
document.getElementById('city2').value = place2.name;
var place2Lat = place2.geometry.location.lat();
var place2Lng = place2.geometry.location.lng();
document.getElementById('cityLat2').value = place2Lat;
document.getElementById('cityLng2').value = place2Lng;
var obj = new Object();
obj.city = place2.name;
obj.latitude = place2.geometry.location.lat();
obj.longitude = place2.geometry.location.lng();
locations.push(obj);
//For intermediate point Source
var place3 = ACDbSource.getPlace();
document.getElementById('city3').value = place3.name;
var place3Lat = place3.geometry.location.lat();
var place3Lng = place3.geometry.location.lng();
document.getElementById('cityLat3').value = place3Lat;
document.getElementById('cityLng3').value = place3Lng;
//For intermediate point Destination
var place4 = ACDbDestination.getPlace();
document.getElementById('city4').value = place4.name;
var place4Lat = place4.geometry.location.lat();
var place4Lng = place4.geometry.location.lng();
document.getElementById('cityLat4').value = place4Lat;
document.getElementById('cityLng4').value = place4Lng;
var p1 = new google.maps.LatLng(place1Lat, place1Lng);
var p2 = new google.maps.LatLng(place2Lat, place2Lng);
//alert(calcDistance(p1, p2));
directionsDisplay = new google.maps.DirectionsRenderer();
var startPlace = new google.maps.LatLng(place1Lat, place1Lng);
var mapOptions = {
zoom: 7,
center: startPlace
}
var map = new google.maps.Map(document.getElementById('map'), mapOptions);
directionsDisplay.setMap(map);
var start = $("#city1").val();
var end = $("#city2").val();
var request = {
origin: start,
destination: end,
travelMode: google.maps.TravelMode.DRIVING
};
var positionsource = new google.maps.LatLng(place3Lat, place3Lng);
var positiondestination = new google.maps.LatLng(place4Lat, place4Lng);
/*if(calcDistance(positiondestination, p1)> calcDistance(positiondestination, p2)) {
alert("Straight path");
}
else {
alert("Reverse path");
}*/
/*var heading1 = google.maps.geometry.spherical.computeHeading(p1, p2);
alert("heading1: " + heading1);
alert("heading2: " + heading2);*/
directionsService.route(request, function (result, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(result);
if ((google.maps.geometry.poly.isLocationOnEdge(positionsource,
new google.maps.Polyline({ path: google.maps.geometry.encoding.decodePath(result.routes[0].overview_polyline.points) }),
0.0100000000))&(google.maps.geometry.poly.isLocationOnEdge(positiondestination,
new google.maps.Polyline({ path: google.maps.geometry.encoding.decodePath(result.routes[0].overview_polyline.points) }),
0.0100000000)))
{
alert("Belongs to the path");
var heading2 = google.maps.geometry.spherical.computeHeading(positionsource, positiondestination);
if(heading2<0) {
alert("Reverse direction");
}
}
else {
alert("Doesnt Belong to the path");
}
}
});
});
}
google.maps.event.addDomListener(window, 'load', initialize);
function refreshMap(locations) {
google.maps.visualRefresh = true;
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 10,
center: new google.maps.LatLng(locations[0].latitude, locations[0].longitude),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var infowindow = new google.maps.InfoWindow();
var marker, i;
for (i = 0; i < locations.length; i++) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[i].latitude, locations[i].longitude),
map: map
});
google.maps.event.addListener(marker, 'click', (function (marker, i) {
return function () {
infowindow.setContent(locations[i].city);
infowindow.open(map, marker);
}
})(marker, i));
}
}
</script>
<body>
<div>
<b>Source A:</b><input id="searchTextFieldSource" type="text" size="50" placeholder="Enter the source" autocomplete="on" runat="server" />
<input type="text" id="city1" name="city1" />
<input type="text" id="cityLat1" name="cityLat1" />
<input type="text" id="cityLng1" name="cityLng1" />
</div>
<div>
<b>Destination B:</b><input id="searchTextFieldDestination" type="text" size="50" placeholder="Enter the destination" autocomplete="on" runat="server" />
<input type="text" id="city2" name="city2" />
<input type="text" id="cityLat2" name="cityLat2" />
<input type="text" id="cityLng2" name="cityLng2" />
</div>
<div>
<b>Intermediate Source C:</b><input id="searchTextFieldIntermediateSource" type="text" size="50" placeholder="Enter the destination" autocomplete="on" runat="server" />
<input type="text" id="city3" name="city3" />
<input type="text" id="cityLat3" name="cityLat3" />
<input type="text" id="cityLng3" name="cityLng3" />
</div>
<div>
<b>Intermediate Destination D:</b><input id="searchTextFieldIntermediateDestination" type="text" size="50" placeholder="Enter the destination" autocomplete="on" runat="server" />
<input type="text" id="city4" name="city4" />
<input type="text" id="cityLat4" name="cityLat4" />
<input type="text" id="cityLng4" name="cityLng4" />
</div>
<input id="clickMe" type="button" value="clickme" onclick="initialize();" />
<div id="map" style="width: 700px; height: 600px;"></div>
</body>
</html>