use*_*648 4 javascript jquery google-maps-api-3 google-maps-markers
我正在从DB读取点作为JSON来在页面上创建地图标记和非结构化列表.添加一些代码以自定义列表元素后,地图停止在第一次请求时显示标记图标 - 直到发出页面重新加载.这是由于API超时吗?可以在加载地图后从数组构建列表对象,还是有其他方法来加速可能消除问题的代码?地图加载标记很好,加上这个标记(300+)的两倍,所以我知道问题是由于将格式添加到列表对象.不需要群集.此处提供该页面的演示版本
签了JS n00b.谢谢....... JSON POWERED GOOGLEMAP
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8">
var map;
var infoWindow = new google.maps.InfoWindow();
function initialize() {
var myLatlng = new google.maps.LatLng(49.57154029531499,-125.74951171875);
var myOptions = {
zoom: 8,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.TERRAIN,
streetViewControl: false
}
this.map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
} /* end initialize function */
<!-- load points from database into Locations JSON -->
$(document).ready(function () {
initialize();
$.getJSON("map-service.php?action=listpoints", function(json) {
if (json.Locations.length > 0) {
for (i=0; i<json.Locations.length; i++) {
var location = json.Locations[i];
addMarker(location);
}
}
});
//define grn icon as closed
var greenicon = 'http://maps.google.com/mapfiles/ms/icons/green-dot.png';
function addMarker(location) {
if(location.datesummit == "0000-00-00") {
var markerOptions = {map: map, title: location.name, position: new google.maps.LatLng(location.lat, location.lng),icon: greenicon};
//create marker info window content
var html='<B>'+location.name+'</B><BR> Register a summit <A href="http://goo.gl/Nl0UQ">here</A> ';
//create list element text and onclick
$("<li class=\"notclimbed\">")
.html(location.name+"</li>")
.click(function(){
infoWindow.close();
infoWindow.setContent(html);
infoWindow.open(map, marker)
})
.appendTo("#list");
}
else{
var markerOptions = {map: map, title: location.name, position: new google.maps.LatLng(location.lat, location.lng)};
//create marker info window content
var html='<B>'+location.name+'</B><BR> Summitted: '+location.datesummit+'<BR> By:'+location.summitlog;
//create list element text and onclick
$("<li class=\"climbed\">")
.html(location.name+"</li>")
.click(function(){
infoWindow.close();
infoWindow.setContent(html);
infoWindow.open(map, marker)
})
.appendTo("#list");
}
var marker = new google.maps.Marker(markerOptions);
// add a listener to open an info window when a user clicks on one of the markers
google.maps.event.addListener(marker, 'click', function() {
infoWindow.close();
infoWindow.setContent(html);
infoWindow.open(map, marker);
});
}; // end of addmarker function
});
</script>
</head>
<body>
<div id="banner" {vertical-align:text-top;} >
<img src="test.jpg" alt="Logo" style="width:150px;height:150px;vertical-align:middle">
<img src="test.png" alt="Logo" style="vertical-align:middle">
</div>
<div id="map_canvas" >
Map Here!
</div>
<div id="mindthegap"></div>
<div id="list" > </div>
</body>
Run Code Online (Sandbox Code Playgroud)
在将map变量传递给markerOptions之前,需要确保初始化map变量.
一些过于热心的调试告诉我,在页面失败的时候,地图仍未定义.
在$(文件).就绪()通常会body.onload之前进行的,所以要么把调用初始化()在你的$的最顶端(文件).就绪(函数(){...}); 或者将代码初始化在那里.
此外,尽管不是绝对必要,但您应该考虑封装地图变量而不是使用全局变量.如果您想在一个页面上有2张地图怎么办?
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