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in Technique[技术] by (71.8m points)

javascript - Google Map API Route Request limit

I am working on my project in which I need to calculate distances of 23 driving routes in Google map. I have the code here. The Lat and lng are already set up in js but I only get 10 route distances back in the web. I check the limitations of google maps api but I don't see only 10 limitations for the route direction. I attached the code.... I am wondering whether anybody can help me figure out.....Thank you so much!

<!DOCTYPE html>
<html>
<html>
    <head><meta name="viewport" content="initial-scale=1.0, user-scalable=no"/><meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
        <title>Google Maps JavaScript API v3 Example: Directions Waypoints</title>
        <link href="http://code.google.com/apis/maps/documentation/javascript/examples/default.css" rel="stylesheet" type="text/css" />
        <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false">
        </script>
        <link type="text/css" rel="stylesheet" href="https://s3.amazonaws.com/GTFS/style.css" media="all" />

    </head>

<body id="mainBody" onload="initialize()">
<div id="headerImage">
<img src="https://s3.amazonaws.com/GTFS/brt.jpg" height="100" width="180" />
</div>

    <header id="mainHeader">
        <hgroup id="mainHeaderGroup">
            <h1>GTFS Data Visualization & Application</h1>
            <br />
            <br />
            <br />
        </hgroup>
    </header>
    <div id="contentContainer" >
        <div id="map_canvas" style="width:0%;height:0%;">
        </div>
        <br />
        <p id="demo">
</p>
        <script type="text/javascript">
    var directionDisplay;
    var directionsService = new google.maps.DirectionsService();
    var map;

    function initialize() {
        directionsDisplay = new google.maps.DirectionsRenderer();
        var chicago = new google.maps.LatLng(-40.321, 175.54);
        var myOptions = {
            zoom: 6,
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            center: chicago
        }
        map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
        directionsDisplay.setMap(map);
        calcRoute();
    }

    function calcRoute()  {
         var locations = [
  ['location1', 30.27361,-97.69835, 4],
  ['location2', 30.273206,-97.700665, 5],
  ['location3',30.272939,-97.70225, 3],
  ['location4', 30.272556,-97.704568, 2],
    ['location5', 30.272509,-97.706226, 4],
  ['location6', 30.272329,-97.708247, 5],
  ['location7', 30.271236,-97.710649, 3],
  ['location8', 30.270419,-97.715, 2],
    ['location8', 30.270096,-97.717001, 4],
  ['location9', 30.269698,-97.719604, 5],
  ['location10', 30.269427,-97.72125, 3],
  ['location11', 30.268978,-97.724138, 2],
   ['location12', 30.270096,-97.717001, 4],
  ['location13', 30.269698,-97.719604, 5],
  ['location14', 30.269427,-97.72125, 3],
  ['location15', 30.268978,-97.724138, 2],
  ['location16', 30.268756,-97.725507, 1],
    ['location17',30.268704,-97.727634, 2],
  ['location18', 30.26956,-97.729989, 4],
  ['location19', 30.269995,-97.731193, 5],
  ['location20', 30.270893,-97.734212, 3],
  ['location21', 30.27116,-97.738825, 2],
   ['location22', 30.271811,-97.741229, 2],
  ['location23', 30.268756,-97.725507, 1]
];   

var i=0;
for (i = 0; i < locations.length - 1; i++) {
var start = new google.maps.LatLng(locations[i][1], locations[i][2]);
var end = new google.maps.LatLng(locations[i + 1][1], locations[i + 1][2]);
var request = {
origin : start,
destination : end,
travelMode : google.maps.DirectionsTravelMode.DRIVING
};
directionsService.route(request,function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
var route = response.routes[0];
document.getElementById("demo").innerHTML += "<strong> <br /> <hr />"+     route.legs[0].distance.text + "</strong>";
}
});
}
}
</script>
</div>
</body>
</html>
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1 Reply

0 votes
by (71.8m points)

The free API has a limitation of 8 waypoints (plus the 2 endpoints give 10). The paid API allows 23 waypoints.

from the documentation

The maximum allowed waypoints is 8, plus the origin, and destination. Maps API for Business customers are allowed 23 waypoints, plus the origin, and destination. Waypoints are not supported for transit directions.

You can try chaining multiple requests together like this, but beware the DirectionsService is subject to rate limits and quotas, so that might not always work.

example with your points


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