Google Maps V3 - 删除所有标记

Question

我希望使用谷歌地图 v3，如果您放大 15 倍以上，地图会显示标记位置，但当您缩小时，我想隐藏标记。我找不到任何功能来做到这一点。到目前为止，没有什么对我有用。

这是我的脚本：

<script type="text/javascript">
        function initialize() {
            var mapOptions = {
              zoom: 15,
              center: new google.maps.LatLng(52.429236, 6.281255),
              mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);

            setMarkers(map, points);

            google.maps.event.addListener(map, 'zoom_changed', function()
{
                        if (map.getZoom() > 15) {
                                setMarkers(map, points);
                        } else {
                                hideMarkers(map, points);

                        }
                           }); 

        }


        var points = [
            ['Location 1', 52.420891, 6.280204],
            ['Location 2', 52.420125, 6.279131],
            ['Location 3', 52.420125, 6.240125]
        ];


        function setMarkers(map, locations) {
            var image = new google.maps.MarkerImage('../images/map/beachflag.png',
            new google.maps.Size(20, 32),
            new google.maps.Point(0,0),
            new google.maps.Point(0, 32));
            var shadow = new google.maps.MarkerImage('../images/map/beachflag_shadow.png',
            new google.maps.Size(37, 32),
            new google.maps.Point(0,0),
            new google.maps.Point(0, 32));
            var shape = {
                coord: [1, 1, 1, 20, 18, 20, 18 , 1],
                type: 'poly'
            };

            for (var i = 0; i < locations.length; i++) {
                var point = locations[i];
                var myLatLng = new google.maps.LatLng(point[1], point[2]);
                var marker = new google.maps.Marker({
                position: myLatLng,
                map: map,
                shadow: shadow,
                icon: image,
                shape: shape,
                title: point[0]
                });
            }
        }

        function hideMarkers(map, locations) {
            /* Remove All Markers */


            console.log("Remove All Markers");
        }
            </script>

请问有人可以帮我解决这个问题吗？

Answer 1

我修改了你的代码。我将所有标记的引用保存在一个数组中。在 hideMarkers 中，我将他们的地图设置为 null 以将它们从地图中删除。

 function initialize() {
        var mapOptions = {
            zoom : 15,
            center : new google.maps.LatLng(52.429236, 6.281255),
            mapTypeId : google.maps.MapTypeId.ROADMAP
        };
        var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);

        var markers = setMarkers(map, access_points);

        google.maps.event.addListener(map, 'zoom_changed', function() {
            if (map.getZoom() > 15) {
                setMarkers(map, access_points);
            }
            else {
                hideMarkers(map, access_points, markers);

            }
        });

    }

    var access_points = [ [ 'Location 1', 52.420891, 6.280204 ], [ 'Location 2', 52.420125, 6.279131 ], [ 'Location 3', 52.420125, 6.240125 ] ];

    function setMarkers(map, locations) {
        var markers= [];
        var image = new google.maps.MarkerImage('../images/map/beachflag.png', new google.maps.Size(20, 32), new google.maps.Point(0, 0), new google.maps.Point(0,
                32));
        var shadow = new google.maps.MarkerImage('../images/map/beachflag_shadow.png', new google.maps.Size(37, 32), new google.maps.Point(0, 0),
                new google.maps.Point(0, 32));
        var shape = {
            coord : [ 1, 1, 1, 20, 18, 20, 18, 1 ],
            type : 'poly'
        };

        for ( var i = 0; i < locations.length; i++) {
            var access_point = locations[i];
            var myLatLng = new google.maps.LatLng(access_point[1], access_point[2]);
            var marker = new google.maps.Marker({
                position : myLatLng,
                map : map,
                shadow : shadow,
                icon : image,
                shape : shape,
                title : access_point[0],
                zIndex : access_point[3]
            }); 
            markers.push(marker);
        }
        return markers;
    }

    function hideMarkers(map, locations, markers) {
        /* Remove All Markers */
        while(markers.length){
            markers.pop().setMap(null);
        }

        console.log("Remove All Markers");
    }

Answer 2

最简单的方法可能是稍微修改您的代码，以便您的标记包含在setMarkers 和hideMarkers 函数都可以访问的数组中。然后，您可以使用Marker class 的setMap 方法从地图中添加/删除标记（将null 传递给setMap 以从地图中删除标记）：

var markers = [];

function createMarkers(/* some args */) {
    // Create your markers, and add each one to the `markers` array
}

function setMarkers() {
    for (var i = 0; i < markers.length; i++) {
        markers[i].setMap(yourMap); //Add the marker to the map
    }
}

function hideMarkers() {
    for (var i = 0; i < markers.length; i++) {
        markers[i].setMap(null); //Remove the marker from the map
    }
}

这种方法还意味着您不必在每次想要显示它们时都重新创建所有 Marker 实例。