Question

我写了以下代码。代码中的值a和b是纬度和经度值，它们由正在运行的python代码定期更新。但是，尽管a和b的值发生了变化，但标记似乎并不像预期的那样每3秒刷新一次。

<html>
<head>
<title>Tracking</title>
<meta name="viewport" content="initial-scale=1.0">
<meta charset="utf-8">
<style>
  html, body {
    height: 100%;
    margin: 0;
    padding: 0;
  }
  #map {
    height: 100%;
  }
  #map-canvas 
{ 
height: 100%; 
width: 100%;
}
</style>
</head>
<body>
<script src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<div id="map-canvas"></div>
<script>
    var a;
    var b;


    a=17.429385;b=78.4451901667;



var map = new google.maps.Map(document.getElementById('map-canvas'), {
zoom: 16,
center: new google.maps.LatLng(a,b),
mapTypeId: google.maps.MapTypeId.ROADMAP
});

function initialize() {
var map = map;
}

function loadMarker(a,b) {

latlng=new google.maps.LatLng(a,b);
new google.maps.Marker({position: latlng, map: map});
}

$(document).ready(
        function() {
            setInterval(function() {


            a=17.429385;b=78.4451901667;      




            latlng=new google.maps.LatLng(a,b);
                marker=new google.maps.Marker({position: latlng, map: map});
                marker.setMap( map );
                marker.setPosition( new google.maps.LatLng( a, b) );
                map.panTo( new google.maps.LatLng( a, b) );
            }, 3000);
        });


initialize();
loadMarker(a,b);        
</script>
</body>
</html>

Answer 1

试试这个

＆＃13;

<html>
    <head>
        <title>Tracking</title>
        <meta name="viewport" content="initial-scale=1.0">
        <meta charset="utf-8">
        <style>
            html, body {
                height: 100%;
                margin: 0;
                padding: 0;
            }
            #map {
                height: 100%;
            }
            #map-canvas 
            { 
                height: 100%; 
                width: 100%;
            }
        </style>
    </head>
    <body>
        <script src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
        <script type="text/javascript" src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
        <div id="map-canvas"></div>
        <script>
            var a, b, varInterval, marker = [];

            var markersPlacement = 0;
            var locations = [];
            locations.push(17.429385 + ',' + 78.4451901667);
            locations.push(41.8369 + ',' + 87.6847); //Chicago
            locations.push(36.1215 + ',' + 115.1739); //LA

            var defaultLocation = locations[markersPlacement].split(',');
            var mapIcon = 'http://images.clipartpanda.com/google-location-icon-location-map-512.png';

            var map = new google.maps.Map(document.getElementById('map-canvas'), {
                zoom: 5,
                center: new google.maps.LatLng(parseFloat(defaultLocation[0]), parseFloat(defaultLocation[1])),
                mapTypeId: google.maps.MapTypeId.ROADMAP
            });

            function deleteMarkers() {
                clearMarkers();
                marker = [];
            }
            function clearMarkers() {
                setMapOnAll(null);
            }

            // Sets the map on all markers in the array.
            function setMapOnAll(map) {
                for (var i = 0; i < marker.length; i++) {
                    marker[i].setMap(map);
                }
            }

            function addMarker(location) {
                var mark = new google.maps.Marker({
                    position: location,
                    map: map,
                    icon: mapIcon,
                });
                marker.push(mark);
            }


            $(document).ready(
                    function () {
                        varInterval = setInterval(function () {
                            console.log(markersPlacement);
                            console.log(locations.length);
                            if (locations.length >= markersPlacement) {
                                deleteMarkers();

                                //REMOVE THE BELOW AND ADD THE AJAX CODE BELOW HERE.
                                defaultLocation = locations[markersPlacement].split(',');
                                addMarker(new google.maps.LatLng(parseFloat(defaultLocation[0]), parseFloat(defaultLocation[1])));
                                markersPlacement++;
                            } else {
                                clearInterval(varInterval);
                            }

                        }, 5000);
                    });


        </script>
    </body>
</html>

＆＃13;

现在，您必须确保在运行setInterval时更新a和b的值。

Ajax代码

// response would be something like
// {"location":{"lat":41.881832,"lng":-87.623177}}

$.ajax({
   cache: false,
   url: "/path/to.json",
   dataType: "json",
   success: function(response) {
       addMarker(new google.maps.LatLng(parseFloat(response.location.lat), parseFloat(response.location.lng)));
   }
});

我想刷新谷歌地图上的标记而不刷新整个页面？

1 个答案:

Ajax代码