Javascript Google Maps v3:无法获取属性的值';setMap';
我是谷歌地图的新手。我将Google Maps v3地图添加到ASP.NET 4.0项目中的aspx文件中,并尝试为地图上的四个KML层添加切换复选框 但是,当我单击复选框时,会出现以下错误:“Microsoft JScript运行时错误:无法获取属性“setMap”的值:对象为null或未定义”。谢谢大家! 以下是HTML:Javascript Google Maps v3:无法获取属性的值';setMap';,javascript,google-maps,google-maps-api-3,Javascript,Google Maps,Google Maps Api 3,我是谷歌地图的新手。我将Google Maps v3地图添加到ASP.NET 4.0项目中的aspx文件中,并尝试为地图上的四个KML层添加切换复选框 但是,当我单击复选框时,会出现以下错误:“Microsoft JScript运行时错误:无法获取属性“setMap”的值:对象为null或未定义”。谢谢大家! 以下是HTML: <body onload="initialize()"> <div id="map-canvas" style="width:1
<body onload="initialize()">
<div id="map-canvas" style="width:100%; height:90%;"></div>
<div id="legend">
<div class="column">
<input type="checkbox" id="landmarksLayer" onclick="toggleKMLLayer(this,'Notable Locations');" checked="checked" />Notable Locations (<img alt="yellow dot" src="Images/GoogleMaps/yellow-dot.png" />)
</div>
</div>
</body>
值得注意的地点()
下面是Javascript:
<%--Javascript--%>
<script type="text/JavaScript" src="http://maps.googleapis.com/maps/api/js?key=[I_Removed_My_Key]&sensor=false"></script>
<script type="text/javascript">
var infowindow = new google.maps.InfoWindow({ "maxWidth": 100 });
var map;
var landmarksLayer;
var publicArtLayer;
var blueEmergencyPhonesLayer;
var buildingsLayer;
//toggle
function toggleKMLLayer(chkbox, kmlLayerID) {
//window.alert(kmlLayerID);
if (chkbox.checked) {
//window.alert("checked");
landmarksLayer.setMap(map);
}
else {
//window.alert("unchecked");
landmarksLayer.setMap(null);
}
}
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(33.585737, -101.884804),
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
var kmlLayerOptions = {
preserveViewport: true,
suppressInfoWindows: true
};
var landmarksLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/landmarks.xml', kmlLayerOptions);
landmarksLayer.setMap(map);
var publicArtLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/art.xml', kmlLayerOptions);
publicArtLayer.setMap(map);
var blueEmergencyPhonesLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/emergency.xml', kmlLayerOptions);
blueEmergencyPhonesLayer.setMap(map);
var buildingsLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/bldgs.xml', kmlLayerOptions);
buildingsLayer.setMap(map);
addKmlClickHandler(landmarksLayer);
addKmlClickHandler(publicArtLayer);
addKmlClickHandler(blueEmergencyPhonesLayer);
addKmlClickHandler(buildingsLayer);
}
// create a new info window for the KML (outage) layer and the geo-coded house marker
function addKmlClickHandler(KmlLayer) {
google.maps.event.addListener(KmlLayer, "click", function (event) {
infowindow.close();
infowindow.setOptions({
pixelOffset: event.pixelOffset,
content: event.featureData.infoWindowHtml,
position: event.latLng
});
infowindow.open(map);
});
}
</script>
var infowindow=new google.maps.infowindow({“maxWidth”:100});
var映射;
var地标层;
var-publicArtLayer;
蓝耳鸣病;
var建筑层;
//拨动
函数切换Kmlayer(chkbox,KmlayerId){
//窗口警报(KmlayerId);
如果(chkbox.checked){
//窗口。警报(“已检查”);
landmarksLayer.setMap(地图);
}
否则{
//窗口。警报(“未选中”);
landmarksLayer.setMap(空);
}
}
函数初始化(){
变量映射选项={
中心:新google.maps.LatLng(33.585737,-101.884804),
缩放:15,
mapTypeId:google.maps.mapTypeId.ROADMAP
};
map=new google.maps.map(document.getElementById(“地图画布”),mapOptions);
变量KmlayerOptions={
对,,
suppressInfoWindows:true
};
var landmarksLayer=new google.maps.KmlLayer('http://www.ttu.edu/map/points/landmarks.xml,KmlayerOptions);
landmarksLayer.setMap(地图);
var publicArtLayer=new google.maps.KmlLayer('http://www.ttu.edu/map/points/art.xml,KmlayerOptions);
publicArtLayer.setMap(map);
var blueEmergencyPhonesLayer=新的google.maps.KmlLayer('http://www.ttu.edu/map/points/emergency.xml,KmlayerOptions);
blueEmergencyPhonesLayer.setMap(地图);
var buildingsLayer=new google.maps.KmlLayer('http://www.ttu.edu/map/points/bldgs.xml,KmlayerOptions);
buildingsLayer.setMap(map);
addKmlClickHandler(landmarksLayer);
addKmlClickHandler(publicArtLayer);
addKmlClickHandler(blueEmergencyPhonesLayer);
addKmlClickHandler(BuildingLayer);
}
//为KML(大修)层和地理编码房屋标记创建一个新的信息窗口
函数addKmlClickHandler(KmlLayer){
google.maps.event.addListener(Kmlayer,“单击”,函数(事件){
infowindow.close();
infowindow.setOptions({
pixelOffset:event.pixelOffset,
内容:event.featureData.infoWindowHtml,
位置:event.latLng
});
打开(地图);
});
}
您正在为图层创建全局变量:
var landmarksLayer;
var publicArtLayer;
var blueEmergencyPhonesLayer;
var buildingsLayer;
但是您没有使用它们(在初始化函数中):
变量前面的“var”创建了initialize函数的本地变量的新版本,使全局版本未初始化。您需要初始化全局版本,以便可以在HTML click listener(在全局上下文中执行)中使用它
var landmarksLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/landmarks.xml', kmlLayerOptions);
landmarksLayer.setMap(map);
var publicArtLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/art.xml', kmlLayerOptions);
publicArtLayer.setMap(map);
var blueEmergencyPhonesLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/emergency.xml', kmlLayerOptions);
blueEmergencyPhonesLayer.setMap(map);
var buildingsLayer = new google.maps.KmlLayer('http://www.ttu.edu/map/points/bldgs.xml', kmlLayerOptions);
buildingsLayer.setMap(map);