javascript - 一次放下一个标记

Question

我正在使用 Google Maps Api v3，并且尝试在 map 上一次放置一个标记，就像 Google Demo 一样但我无法让它工作，这是我的代码，所有标记都会同时删除。

var map;
var markers = [];

function initialize() { 
    var latlng = new google.maps.LatLng(52.520816, 13.410186);

    var options = {
        zoom: 5,
        center: latlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    map = new google.maps.Map(document.getElementById("map-canvas"), options);
}

initialize();

function loadMarkers() {  

    $.ajax({
       url: 'js/poi.php',
       type: 'GET',
       dataType : "json",
       success: function (data) {

            var latlngbounds = new google.maps.LatLngBounds();      


            $.each(data, function(index, point) {

                var marker = new google.maps.Marker({
                    position: new google.maps.LatLng(point.Lat, point.Lng),
                    animation: google.maps.Animation.DROP,
                    icon: 'img/marker.png'

                });


                markers.push(marker);
                latlngbounds.extend(marker.position);

            });

            var markerCluster = new MarkerClusterer(map, markers);
            map.fitBounds(latlngbounds);

        }

    });
}

loadMarkers();

我尝试在每个标记上使用超时，但我猜想 loadMarkers();总是会立即丢弃它们...

    setTimeout(function() {

        var marker = new google.maps.Marker({
            position: new google.maps.LatLng(point.Lat, point.Lng),
            animation: google.maps.Animation.DROP,
            icon: 'img/marker.png'

        });

    }, point.Id * 200);

关于如何解决这个问题有什么想法吗？

编辑: poi.php 文件列出了我的表中的所有点并像这样输出它们:

[
{"Id":"1","Lat":"52.511467","Lgn":"13.447179"},
{"Id":"2","Lat":"52.549061","Lgn":"13.422975"},
{"Id":"3","Lat":"52.497622","Lgn":"13.396110"},
{"Id":"4","Lat":"52.517683","Lgn":"13.394393"}
]

Answer 1

1. 在将标记添加到 map 时将其添加到聚类器
2. 调整边界以显示添加的标记
3. 修复了 JSON 中的拼写错误(不知道这是否是一个问题)

function initialize() {
    var latlng = new google.maps.LatLng(52.520816, 13.410186);

    var options = {
        zoom: 5,
        center: latlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    map = new google.maps.Map(document.getElementById("map-canvas"), options);
    loadMarkers();
}

function loadMarkers() {
    $.ajax({
        type: 'POST',
        dataType: 'json',
        url: '/echo/json/',
        data: {
            json: JSON.stringify(jsonData)
        },
        delay: 3,
        success: function (data) {
            var markerCluster = new MarkerClusterer(map, markers);
            var latlngbounds = new google.maps.LatLngBounds();
            $.each(data, function (index, point) {
                    setTimeout(function() {
                      var marker = new google.maps.Marker({
                        position: new google.maps.LatLng(point.Lat, point.Lng),
                        animation: google.maps.Animation.DROP,
                        map: map /* don't have your custom marker
                        icon: 'img/marker.png'*/
                      });
                      markerCluster.addMarker(marker);
                      markers.push(marker);
                      // adjust the bounds to show all the markers
                      latlngbounds.extend(marker.getPosition());
                      map.fitBounds(latlngbounds);
                    }, point.Id * 200);
            });
        }
    });
}

working fiddle