从 google 地图 xml 中移除标记

Question

我正在尝试在定期刷新的 Google 地图上显示标记。

我找到了这段代码，可以将它们添加到地图中，但我需要知道如何在每次刷新时删除它们，以便它们停止在地图上显示不再在 xml 文件中。

< script >
var map = null;

function initialize() {
var mapOptions = {
    zoom: 12,
    center: new google.maps.LatLng(53.3478, -6.2597) //center over dublin
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
loadXMLFile();
}

function loadXMLFile() {
var filename = 'data.xml';
$.ajax({
    type: "GET",
    url: filename,
    dataType: "xml",
    success: parseXML,
    error: onXMLLoadFailed
});

function onXMLLoadFailed() {
    alert("An Error has occurred.");
}

function parseXML(xml) {
    var bounds = new google.maps.LatLngBounds();
    $(xml).find("marker").each(function() {
        //Read the name, address, latitude and longitude for each Marker
        var nme = $(this).find('name').text();
        var address = $(this).find('address').text();
        var lat = $(this).find('lat').text();
        var lng = $(this).find('lng').text();
        var markerCoords = new google.maps.LatLng(parseFloat(lat), parseFloat(lng));
        bounds.extend(markerCoords);
        var marker = new google.maps.Marker({
            position: markerCoords,
            map: map
        });
    });
    map.fitBounds(bounds);
}
}
google.maps.event.addDomListener(window, 'load', initialize); 
< /script>

这在通过调用函数 loadXMLFile() 添加新标记时效果很好，但如果它们被删除，它们就会保留在地图上。我想我需要删除它们 https://developers.google.com/maps/documentation/javascript/examples/marker-remove 但我不知道如何应用它。

这几天一直让我抓狂。谁能帮帮我？

编辑：

我的完整代码没有渲染地图：

<!DOCTYPE html>
<html>
  <head>
    <title>Simple Map</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
#map-canvas {
    height: 400px;
    margin-bottom: 10px;
}      }
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>
    <script>
var map;
var markers = [];

function initialize() {

    var mapOptions = {
        zoom: 8,
        mapTypeId: google.maps.MapTypeId.ROADMAP,
        center: new google.maps.LatLng(59.76522, 18.35002)
    };

    map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

    google.maps.event.addDomListener(document.getElementById('add-markers'), 'click', addMarkers);
    google.maps.event.addDomListener(document.getElementById('remove-markers'), 'click', removeMarkers);
}

function addMarkers() {

    var coords = [
    new google.maps.LatLng(59.32522, 18.07002),
    new google.maps.LatLng(59.45522, 18.12002),
    new google.maps.LatLng(59.86522, 18.35002),
    new google.maps.LatLng(59.77522, 18.88002),
    new google.maps.LatLng(59.36344, 18.36346),
    new google.maps.LatLng(59.56562, 18.33002)];

    for (var i = 0; i < coords.length; i++) {

        var marker = new google.maps.Marker({
            map: map,
            position: coords[i]
        });

        markers.push(marker);
    }
}

function removeMarkers() {

    for (var i = 0; i < markers.length; i++) {

        markers[i].setMap(null);
    }
}

initialize();

    </script>
  </head>
  <body>
   <div id="map-canvas"></div>
<button id="add-markers">Add markers</button>
<button id="remove-markers">Remove markers</button>
  </body>
</html>

Answer 1

1) 创建一个数组来保存你的标记

var markers = [];

2) 将每个标记添加到地图时将它们推送到数组

var marker = new google.maps.Marker({
    position: markerCoords,
    map: map
});

markers.push(marker);

3) 当您需要删除它们时，遍历您的数组并在每个标记上调用 setMap(null)

for (var i=0; i<markers.length; i++) {

    markers[i].setMap(null);
}

希望对您有所帮助。

JSFiddle demo

编辑:

这是您的代码，经过我的修改后更新。我猜你定期调用 loadXMLFile() 函数 (?)。

var map = null;
var markers = [];

function initialize() {
    var mapOptions = {
        zoom: 12,
        center: new google.maps.LatLng(53.3478, -6.2597) //center over dublin
    };
    map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
    loadXMLFile();
}

function loadXMLFile() {

    for (var i = 0; i < markers.length; i++) {

        markers[i].setMap(null);
    }

    var filename = 'data.xml';
    $.ajax({
        type: "GET",
        url: filename,
        dataType: "xml",
        success: parseXML,
        error: onXMLLoadFailed
    });

    function onXMLLoadFailed() {
        alert("An Error has occurred.");
    }

    function parseXML(xml) {
        var bounds = new google.maps.LatLngBounds();
        $(xml).find("marker").each(function () {
            //Read the name, address, latitude and longitude for each Marker
            var nme = $(this).find('name').text();
            var address = $(this).find('address').text();
            var lat = $(this).find('lat').text();
            var lng = $(this).find('lng').text();
            var markerCoords = new google.maps.LatLng(parseFloat(lat), parseFloat(lng));
            bounds.extend(markerCoords);
            var marker = new google.maps.Marker({
                position: markerCoords,
                map: map
            });

            markers.push(marker);
        });
        map.fitBounds(bounds);
    }
}
google.maps.event.addDomListener(window, 'load', initialize);

从 google 地图 xml 中移除标记

Removing markers from google maps xml

javascript

google-maps

google-maps-api-3

xml-parsing