最全面的百度地图JavaScript离线版开发攻略
引言
百度地图JavaScript离线版是百度地图提供的一种离线部署方式,通过下载地图数据到本地,可以在没有网络连接的情况下使用百度地图API,从而使地图功能更加稳定和可靠。本攻略旨在详细介绍如何使用百度地图JavaScript离线版进行地图开发,包括环境搭建、地图初始化、地图控件添加、基本交互功能实现、离线导航等内容。
环境搭建
下载百度地图JavaScript离线版
- 登录百度地图开发者中心:http://lbsyun.baidu.com/
- 进入“开放平台”菜单 -> “API管理” -> “离线地图API” -> “Javascript离线包”页面。
- 根据自己的需求,选择需要的地图版本和语言版本,然后点击“下载”按钮,将下载的压缩包解压到本地。
引入百度地图JavaScript离线版
在html文件中引入百度地图JavaScript离线版的js文件:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度地图离线版Javascript API示例</title>
<script type="text/javascript" src="./js/Baidu_offline_API_v3.0_min.js"></script>
</head>
<body>
<div id="map_container" style="width:100%;height:600px;"></div>
</body>
地图初始化
创建地图容器和地图对象,设置地图的中心点和缩放级别:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度地图离线版Javascript API示例</title>
<style type="text/css">
#map_container {
width: 100%;
height: 600px;
}
</style>
<script type="text/javascript" src="./js/Baidu_offline_API_v3.0_min.js"></script>
<script type="text/javascript">
var map = new BMap.Map("map_container");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);
</script>
</head>
<body>
<div id="map_container"></div>
</body>
地图控件添加
添加缩放控件、地图类型控件和比例尺控件:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度地图离线版Javascript API示例</title>
<style type="text/css">
#map_container {
width: 100%;
height: 600px;
}
</style>
<script type="text/javascript" src="./js/Baidu_offline_API_v3.0_min.js"></script>
<script type="text/javascript">
var map = new BMap.Map("map_container");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);
var navigationControl = new BMap.NavigationControl();
map.addControl(navigationControl);
var scaleControl = new BMap.ScaleControl();
map.addControl(scaleControl);
var mapTypeControl = new BMap.MapTypeControl();
map.addControl(mapTypeControl);
</script>
</head>
<body>
<div id="map_container"></div>
</body>
基本交互功能实现
添加鼠标拖动、缩放地图等基本交互功能:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度地图离线版Javascript API示例</title>
<style type="text/css">
#map_container {
width: 100%;
height: 600px;
}
</style>
<script type="text/javascript" src="./js/Baidu_offline_API_v3.0_min.js"></script>
<script type="text/javascript">
var map = new BMap.Map("map_container");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);
var navigationControl = new BMap.NavigationControl();
map.addControl(navigationControl);
var scaleControl = new BMap.ScaleControl();
map.addControl(scaleControl);
var mapTypeControl = new BMap.MapTypeControl();
map.addControl(mapTypeControl);
map.enableScrollWheelZoom();
map.enableContinuousZoom();
map.enableDragging();
</script>
</head>
<body>
<div id="map_container"></div>
</body>
离线模式切换
离线模式下地图会使用本地缓存数据,需要手动切换离线模式和在线模式:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度地图离线版Javascript API示例</title>
<style type="text/css">
#map_container {
width: 100%;
height: 600px;
}
</style>
<script type="text/javascript" src="./js/Baidu_offline_API_v3.0_min.js"></script>
<script type="text/javascript">
var map = new BMap.Map("map_container");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);
var navigationControl = new BMap.NavigationControl();
map.addControl(navigationControl);
var scaleControl = new BMap.ScaleControl();
map.addControl(scaleControl);
var mapTypeControl = new BMap.MapTypeControl();
map.addControl(mapTypeControl);
map.enableScrollWheelZoom();
map.enableContinuousZoom();
map.enableDragging();
var offlineMode = false;
function toggleMode() {
offlineMode = !offlineMode;
BMap.OfflineProvider.prototype._switchProvider(offlineMode);
alert("已切换为" + (offlineMode ? "离线" : "在线") + "模式!");
}
</script>
</head>
<body>
<div>
<button onclick="toggleMode()">切换为离线/在线模式</button>
</div>
<div id="map_container"></div>
</body>
离线导航
使用离线地图数据进行导航功能展示:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度地图离线版Javascript API示例</title>
<style type="text/css">
#map_container {
width: 100%;
height: 600px;
}
</style>
<script type="text/javascript" src="./js/Baidu_offline_API_v3.0_min.js"></script>
<script type="text/javascript">
var map = new BMap.Map("map_container");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);
var navigationControl = new BMap.NavigationControl();
map.addControl(navigationControl);
var scaleControl = new BMap.ScaleControl();
map.addControl(scaleControl);
var mapTypeControl = new BMap.MapTypeControl();
map.addControl(mapTypeControl);
map.enableScrollWheelZoom();
map.enableContinuousZoom();
map.enableDragging();
var offlineMode = false;
function toggleMode() {
offlineMode = !offlineMode;
BMap.OfflineProvider.prototype._switchProvider(offlineMode);
alert("已切换为" + (offlineMode ? "离线" : "在线") + "模式!");
}
var startLat = 39.911222;
var startLng = 116.396745;
var endLat = 39.915052;
var endLng = 116.403955;
var startPoint = new BMap.Point(startLng, startLat);
var endPoint = new BMap.Point(endLng, endLat);
var driving = new BMap.DrivingRoute(map);
driving.search(startPoint, endPoint);
</script>
</head>
<body>
<div>
<button onclick="toggleMode()">切换为离线/在线模式</button>
</div>
<div id="map_container"></div>
</body>
示例
以上是百度地图JavaScript离线版开发的完整攻略。下面提供两个示例,供读者参考:
示例1:线上使用多当地图进行地图开发
线上使用多当地图的Javascript API进行地图开发,但是由于多当地图API的不稳定性,需要使用百度离线地图作为备用方案,提高地图的可靠性。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>使用多当地图实现的地图应用</title>
<style type="text/css">
#map_container {
width: 100%;
height: 600px;
}
</style>
<script type="text/javascript" src="./js/MultiMap.js"></script>
<script type="text/javascript">
var map = new MultiMap.Map("map_container", {
center: [116.404, 39.915],
zoom: 15,
provider: "MultiMap",
apiKey: "your API key",
offline: true,
});
var navigationControl = new MultiMap.NavigationControl();
map.addControl(navigationControl);
var scaleControl = new MultiMap.ScaleControl();
map.addControl(scaleControl);
var mapTypeControl = new MultiMap.MapTypeControl();
map.addControl(mapTypeControl);
map.enableScrollWheelZoom();
map.enableContinuousZoom();
map.enableDragging();
var offlineMode = false;
function toggleMode() {
offlineMode = !offlineMode;
map.setOfflineMode(offlineMode);
alert("已切换为" + (offlineMode ? "离线" : "在线") + "模式!");
}
</script>
</head>
<body>
<div>
<button onclick="toggleMode()">切换为离线/在线模式</button>
</div>
<div id="map_container"></div>
</body>
</html>
示例2:离线地图导航应用
使用离线地图数据进行导航功能展示:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>百度地图离线版Javascript API示例</title>
<style type="text/css">
#map_container {
width: 100%;
height: 600px;
}
</style>
<script type="text/javascript" src="./js/Baidu_offline_API_v3.0_min.js"></script>
<script type="text/javascript">
var map = new BMap.Map("map_container");
var point = new BMap.Point(116.404, 39.915);
map.centerAndZoom(point, 15);
var navigationControl = new BMap.NavigationControl();
map.addControl(navigationControl);
var scaleControl = new BMap.ScaleControl();
map.addControl(scaleControl);
var mapTypeControl = new BMap.MapTypeControl();
map.addControl(mapTypeControl);
map.enableScrollWheelZoom();
map.enableContinuousZoom();
map.enableDragging();
var offlineMode = false;
function toggleMode() {
offlineMode = !offlineMode;
BMap.OfflineProvider.prototype._switchProvider(offlineMode);
alert("已切换为" + (offlineMode ? "离线" : "在线") + "模式!");
}
var startLat = 39.911222;
var startLng = 116.396745;
var endLat = 39.915052;
var endLng = 116.403955;
var startPoint = new BMap.Point(startLng, startLat);
var endPoint = new BMap.Point(endLng, endLat);
var driving = new BMap.DrivingRoute(map);
driving.search(startPoint, endPoint);
</script>
</head>
<body>
<div>
<button onclick="toggleMode()">切换为离线/在线模式</button>
</div>
<div id="map_container"></div>
</body>
</html>
以上两个示例均可以运行在本地环境中。
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