我的网站上有许多页面显示带有一堆标记的Google地图here's an example。
正如您所看到的,地图需要很长时间才能加载,我正在寻找改进方法。我希望使用GeoWebCache来缓存服务器上的地图图块,但我被告知这会违反Google地图的使用条款。
我在下面附加了用于显示地图和添加标记的代码。这是Google Maps V3 JavaScript API非常简单的用法,所以我认为没有太多优化它的空间。我可以采取哪些明显的步骤来缩短地图加载时间吗?
SF.Map = function(elementId, zoomLevel, center, baseImageDir) {
this._baseImageDir = baseImageDir;
var focalPoint = new google.maps.LatLng(center.latitude, center.longitude);
var mapOptions = {
streetViewControl: false,
zoom: zoomLevel,
center: focalPoint,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: false
};
this._map = new google.maps.Map(document.getElementById(elementId), mapOptions);
this._shadow = this._getMarkerImage('shadow.png');
};
SF.Map.prototype._getMarkerImage = function(imageFile) {
return new google.maps.MarkerImage(this._baseImageDir + '/map/' + imageFile);
};
SF.Map.prototype._addField = function(label, value) {
return "<span class='mapField'><span class='mapLabel'>" + label + ": </span><span class='mapValue'>" + value + "</span></span>";
};
/**
* Add a marker to the map
* @param festivalData Defines where the marker should be placed, the icon that should be used, etc.
* @param openOnClick
*/
SF.Map.prototype.addMarker = function(festivalData, openOnClick) {
var map = this._map;
var markerFile = festivalData.markerImage;
var marker = new google.maps.Marker({
position: new google.maps.LatLng(festivalData.latitude, festivalData.longitude),
map: map,
title: festivalData.name,
shadow: this._shadow,
animation: google.maps.Animation.DROP,
icon: this._getMarkerImage(markerFile)
});
var bubbleContent = "<a class='festivalName' href='" + festivalData.url + "'>" + festivalData.name + "</a><br/>";
var startDate = festivalData.start;
var endDate = festivalData.end;
if (startDate == endDate) {
bubbleContent += this._addField("Date", startDate);
} else {
bubbleContent += this._addField("Start Date", startDate) + "<br/>";
bubbleContent += this._addField("End Date", endDate);
}
// InfoBubble example page http://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobubble/examples/example.html
var infoBubble = new InfoBubble({
map: map,
content: bubbleContent,
shadowStyle: 1,
padding: 10,
borderRadius: 8,
borderWidth: 1,
borderColor: '#2c2c2c',
disableAutoPan: true,
hideCloseButton: false,
arrowSize: 0,
arrowPosition: 50,
arrowStyle: 0
});
var mapEvents = google.maps.event;
// either open on click or open/close on mouse over/out
if (openOnClick) {
var showPopup = function() {
if (!infoBubble.isOpen()) {
infoBubble.open(map, marker);
}
};
mapEvents.addListener(marker, 'click', showPopup);
} else {
mapEvents.addListener(marker, 'mouseover', function() {
infoBubble.open(map, marker);
});
mapEvents.addListener(marker, 'mouseout', function() {
infoBubble.close();
});
}
};
答案 0 :(得分:2)
您可以尝试“延迟加载”谷歌地图,如下所示:
var script=document.createElement("script");
script.type="text/javascript";
script.async=true;
script.src="http://maps.google.com/maps/api/js?sensor=false&callback=handleApiReady";
document.body.appendChild(script);
或者就像这样我是如何使用Facebook AIP的,这样就不会减慢初始加载时间。
$.getScript('http://connect.facebook.net/en_US/all.js#xfbml=1', function() {
FB.init({appId: opt.facebook_id, status: true, cookie: true, xfbml: true});
});
示例:http://blog.rotacoo.com/lazy-loading-instances-of-the-google-maps-api
另外看你的HTML你有很多JS应该在外部JS文件而不是内联,你不能传递一个数组,而不是有很多重复的内联代码。
答案 1 :(得分:1)
一种选择是拍摄静态快照并在其后面创建地图。地图完全加载后,用静态地图替换动态地图。
我还建议你看看: https://developers.google.com/maps/documentation/staticmaps/
可能是您可以在不使用完整动态地图API的情况下为您的网站提供更简单的解决方案。