本地映像对象未在Javascript中正确初始化
Local Image object not getting initialized properly in Javascript
我面临一个问题,For循环中的本地对象没有在Javascript中的每次迭代中初始化。
以下代码工作正常:
function initialize() {
var mapOptions = {
zoom: 10,
center: new google.maps.LatLng(-33.9, 151.2)
}
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
setMarkers(map, beaches);
}
var beaches = [
['Bondi Beach', -33.890542, 151.274856, 4, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png'],
['Coogee Beach', -33.923036, 151.259052, 5, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png'],
['Cronulla Beach', -34.028249, 151.157507, 3, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png'],
['Manly Beach', -33.80010128657071, 151.28747820854187, 2, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png'],
['Maroubra Beach', -33.950198, 151.259302, 1, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png']
];
function setMarkers(map, locations) {
for (var i = 0; i < locations.length; i++) {
var beach = locations[i];
var image = {
url: beach[4],
size: new google.maps.Size(20, 32),
origin: new google.maps.Point(0, 0),
anchor: new google.maps.Point(0, 32)
};
var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
icon: image,
title: beach[0],
zIndex: beach[3]
});
}
}
google.maps.event.addDomListener(window, 'load', initialize)
但是,如果我的第一个数组变成这样,所有的标志都将停止显示
['Bondi Beach', -33.890542, 151.274856, 4, ''];
为什么Map Marker每次都没有初始化?谷歌地图上有我遗漏的东西吗?
示例代码的JSFiddle链接:http://jsfiddle.net/anujagg/Lrkvu4mu/25/
谢谢。
url为"的google.maps.Icon无效。
var image = {
url: beach[4],
size: new google.maps.Size(20, 32),
origin: new google.maps.Point(0, 0),
anchor: new google.maps.Point(0, 32)
};
在这种情况下生成了一个javascript错误:
未捕获的类型错误:无法读取未定义的属性"dx"
在这种情况下,更改代码以传入图像的null:
if (beach[4] != '') {
var image = {
url: beach[4],
size: new google.maps.Size(20, 32),
origin: new google.maps.Point(0, 0),
anchor: new google.maps.Point(0, 32)
};
} else {
var image = null;
}
工作小提琴
代码片段:
function initialize() {
var mapOptions = {
zoom: 10,
center: new google.maps.LatLng(-33.9, 151.2)
}
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
setMarkers(map, beaches);
}
var beaches = [
['Bondi Beach', -33.890542, 151.274856, 4, ''],
['Coogee Beach', -33.923036, 151.259052, 5, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png'],
['Cronulla Beach', -34.028249, 151.157507, 3, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png'],
['Manly Beach', -33.80010128657071, 151.28747820854187, 2, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png'],
['Maroubra Beach', -33.950198, 151.259302, 1, 'https://google-developers.appspot.com/maps/documentation/javascript/examples/full/images/beachflag.png']
];
function setMarkers(map, locations) {
for (var i = 0; i < locations.length; i++) {
var beach = locations[i];
if (beach[4] != '') {
var image = {
url: beach[4],
size: new google.maps.Size(20, 32),
origin: new google.maps.Point(0, 0),
anchor: new google.maps.Point(0, 32)
};
} else {
var image = null;
}
var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
icon: image,
title: beach[0],
zIndex: beach[3]
});
}
}
google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map-canvas"></div>
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