Google Maps API v3中的多个标记,单击时链接到不同的页面

Question

我有一个带有多个标记的地图,我通过数组填充.每个标记都是可点击的,并且应该将用户带到每个标记的不同URL.

问题是所有标记在显示正确标题时都使用数组中最后一个条目的url.

这是我的代码:

var myOptions = { zoom: 9, center: new google.maps.LatLng(40.81940575,-73.95647955), mapTypeId: google.maps.MapTypeId.TERRAIN }
var map = new google.maps.Map(document.getElementById("bigmap"), myOptions);
setMarkers(map, properties);

var properties = [
['106 Ft Washington Avenue',40.8388485,-73.9436015,'Mjg4'],
['213 Bennett Avenue',40.8574384,-73.9333426,'Mjkz'],
['50 Overlook Terrace',40.8543752,-73.9362542,'Mjky'],
['850 West 176 Street',40.8476012,-73.9417571,'OTM='],
['915 West End Avenue',40.8007478,-73.9692155,'Mjkx']];

function setMarkers(map, buildings) {
    var image = new google.maps.MarkerImage('map_marker.png', new google.maps.Size(19,32), new google.maps.Point(0,0), new google.maps.Point(10,32));
    var shadow = new google.maps.MarkerImage('map_marker_shadow.png', new google.maps.Size(28,32), new google.maps.Point(0,0), new google.maps.Point(10,32));
    var bounds = new google.maps.LatLngBounds;
    for (var i in buildings) {
        var myLatLng = new google.maps.LatLng(buildings[i][1], buildings[i][2]);
        bounds.extend(myLatLng);
        var marker = new google.maps.Marker({ position: myLatLng, map: map, shadow: shadow, icon: image, title: buildings[i][0] });
        google.maps.event.addListener(marker, 'click', function() { window.location = ('detail?b=' + buildings[i][3]); });
    }
    map.fitBounds(bounds);
}

使用此代码,单击任何标记会使用户"详细信息？b = Mjkx"

我究竟做错了什么？

Answer 1

问题是你的点击处理程序正在使用i外部函数中的变量.

执行循环不会在每次迭代中创建变量的单独副本,因此您的回调函数i对所有回调使用相同的值.

要修复它,请编写一个单独的函数来生成回调.

例如:

function buildClickHandler(i) {
    return function() { window.location = ('detail?b=' + buildings[i][3]); };
}

for(var i = 0; i < buildings.length; i++) {
    //...
    google.maps.event.addListener(marker, 'click', buildClickHandler(i));
}

(你需要在buildClickHandler里面定义setMarkers所以它可以使用buildings参数)

顺便说一句,当循环遍历数组时,不应该使用for in循环,因为它还将迭代数组对象上的任何其他成员.