每次防止添加我改变下拉值

Question

我陷入了这样一种情况：每次更改下拉列表中的标记都是每次添加标记。 。 。我是否需要SetMap Null每次更改下拉列表，以便标记不会填充相同的标记？

或我需要在我的代码集中执行的其他方法或更改

var Rad = 0;
var customerlocationID = 0;

var geocoder, infoBubble, geocode;
var map;
var selectedMarker;
var ID;
//var mgr;
$("#ddlRadius").live("change", function () {
    var selectValue = "";
    selectValue = $("#ddlRadius option:selected").val();

    if (selectValue == "77") {
        Rad = 5;
        codeAddress(customerlocationID, Rad);
    }
    else if (selectValue == "78") {
        Rad = 10;
        codeAddress(customerlocationID, Rad);
    }
    else if (selectValue == "79") {
        Rad = 25;
        codeAddress(customerlocationID, Rad);
    }
    else if (selectValue == "80") {
        Rad = 50;
        codeAddress(customerlocationID, Rad);
    }
    else if (selectValue == "81") {
        Rad = 100;
        codeAddress(customerlocationID, Rad);
    }
});



function initialize() {
    var minZoomLevel = 4;
    var zooms = 7;
    geocoder = new google.maps.Geocoder();
    geocode = new google.maps.Geocoder();

    // Used to Set the Center of the Maps on the Logged User
    $.getJSON('/Dashboard/LoadAddress', function Geocoding(address) {
        $.each(address, function () {
            customerlocationID = this["ID"];
            var currValAddress = this["AddressLine1"];
            var Latitude = this["Latitude"];
            var Longitude = this["Longitude"];
            var LatLang = new google.maps.LatLng(Latitude, Longitude);
            var addresse = {
                zoom: 8,
                center: LatLang,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            map = new google.maps.Map(document.getElementById('map'), addresse);


            // Bounds for North America
            var strictBounds = new google.maps.LatLngBounds(
              new google.maps.LatLng(15.70, -160.50),
              new google.maps.LatLng(68.85, -55.90));

            // Listen for the dragend event
            google.maps.event.addListener(map, 'dragend', function () {
                if (strictBounds.contains(map.getCenter())) return;
                // We're out of bounds - Move the map back within the bounds

                var c = map.getCenter(),
              x = c.lng(),
              y = c.lat(),
              maxX = strictBounds.getNorthEast().lng(),
              maxY = strictBounds.getNorthEast().lat(),
              minX = strictBounds.getSouthWest().lng(),
              minY = strictBounds.getSouthWest().lat();

                if (x < minX) x = minX;
                if (x > maxX) x = maxX;
                if (y < minY) y = minY;
                if (y > maxY) y = maxY;

                map.setCenter(new google.maps.LatLng(y, x));
            });

            // Limit the zoom level
            google.maps.event.addListener(map, 'zoom_changed', function () {
                if (map.getZoom() < minZoomLevel) map.setZoom(minZoomLevel);
            });
        });
    });
    codeAddress(customerlocationID, Rad);
}



var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
function codeAddress(customerlocationID, Rad) {
    infoBubble = new InfoBubble({
        map: map,
        shadowStyle: 0,
        padding: 10,
        borderRadius: 10,
        arrowSize: 15,
        maxWidth: 300,
        borderWidth: 1,
        borderColor: '#ccc',
        arrowPosition: 50,
        arrowStyle: 0
    });
    $.getJSON('/Dashboard/LoadWorkerList1' + '?customerLocationID=' + customerlocationID + '&radius=' + Rad, function Geocode(addresses) {
        $.each(addresses, function () {
            var currVal = this["AddressLine1"];
            var Name = this["Name"];
            var Gender = this["Gender"];
            var Bdate = this["Birthdate"];
            ID = this["Worker_ID"];
            var distance = this["Distance"];
            var workerDetailIDDD = this["Worker_ID"];
            var Latitude = this["Latitude"];
            var Longitude = this["Longitude"];
            var LatLang = new google.maps.LatLng(Latitude, Longitude);

            var marker = new google.maps.Marker({
                map: map,
                icon: '/Content/images/male.png',
                position: LatLang,
                title: currVal
            })

            var link = $('<a href="#">' + currVal + '</a>').data('location', LatLang);
            $('#places').append($('<li id=\'List\' class=\'List\'>').append(link));
            link.on('click', function (event) {
                event.preventDefault();
                google.maps.event.trigger(addresses[0], "click");
                if (selectedMarker) {
                    selectedMarker.setIcon('/Content/images/male.png');
                }
                marker.setIcon('/Content/images/maleclicked.png');
                selectedMarker = marker;
                infoBubble.removeTab(0);
                infoBubble.addTab(Name, "Name: " + Name + "<br> Address: " + currVal + "<br> Gender: " + Gender + "<br> Birthdate: " + Bdate + "<br> Distance: " + distance + "<br><br>" + '<center><a href="/Dashboard/WorkerMapDetail?workerId=' + workerDetailIDDD + '" onclick="window.open(this.href,height=850,width=1200);return false""><span style="font-size: 12px !important">View Profile</span></a></center>');
                infoBubble.open(map, marker);
            });


            google.maps.event.addListener(map, 'idle', function () {
                $('#places li').each(function () {
                    var inside = (map.getBounds().contains($(this).find('a').data('location'))) ? '' : 'none';
                    $(this).css('display', inside);
                });
            });

            // Listen for user click on map to close any open info bubbles
            google.maps.event.addListener(map, "click", function () {
                infoBubble.close();
                marker.setIcon('/Content/images/male.png');
            });

            google.maps.event.addListener(map, "dragstart", function () {
                infoBubble.close();
                marker.setIcon('/Content/images/male.png');
            });

            google.maps.event.addListener(marker, 'click', (function (marker, i) {
                return function () {
                    if (selectedMarker) {
                        selectedMarker.setIcon('/Content/images/male.png');
                    }


                    marker.setIcon('/Content/images/maleclicked.png');
                    selectedMarker = marker;
                    infoBubble.removeTab(0);
                    infoBubble.addTab(Name, "Name: " + Name + "<br> Address: " + currVal + "<br> Gender: " + Gender + "<br> Birthdate: " + Bdate + "<br> Distance: " + distance + "<br><br>" + '<center><a href="/Dashboard/WorkerMapDetail?workerId=' + workerDetailIDDD + '" onclick="window.open(this.href,height=850,width=1200);return false""><span style="font-size: 12px !important">View Profile</span></a></center>');
                    infoBubble.open(map, marker);
                }

            })(marker, currVal));
            addresses.push(marker);

        })


        google.maps.event.trigger(map, 'bounds_changed');


    })

}


window.onload = function () {
    initialize();
}