Web Front-endHTML TutorialHTML5 example of obtaining current geographical location and displaying it on Baidu mapHTML5 example of obtaining current geographical location and displaying it on Baidu map
1.HTML5 obtains the current geographical location
HTML5 Geolocation API (Geolocation Application Programming Interface) can obtain the current geographical location, using GPS on mobile phones and computers Then based on network positioning
Check whether the browser supports HTML5 Geolocation API
<script type="text/javascript">if(navigator.geolocation){
alert('浏览器支持GeoLocation!');
}else{
alert('浏览器不支持GeoLocation!');
}</script>Provides 3 calling methods
// 获取用户当前位置void getCurrentPosition(onSuccess, onError, options);// 持续获取用户当前位置,showLocation表示回调方法int watchPosition(showLocation, onError, options);// 取消监控, watchId 为watchPosition返回值void clearWatch(watchId);
onSuccess Callback method after success (required)
onError Failure callback method (optional)
options Other parameters (optional)
options = {
enableHighAccuracy, // boolean，是否要求高精度的地理信息
timeout, // 最大等待时间，默认0毫秒
maximumAge // 应用程序缓存时间}2. Call Baidu map display
<!DOCTYPE html><html><head><meta charset="utf-8"/> <title>基于HTML5查找地理位置并调用百度API展示</title> <script type="text/javascript" src="http://api.map.baidu.com/api?v=1.2"></script> <script type="text/javascript">
// 调用HTML5 GeoLocation API获取地理位置
function getLocation(){
document.getElementById('container').innerHTML = '正在搜寻中，请稍候。。。'; var options = {
enableHighAccuracy:true,
maximumAge:1000
} if(navigator.geolocation){ //浏览器支持geolocation
navigator.geolocation.getCurrentPosition(onSuccess,onError,options);
}else{ //浏览器不支持geolocation
alert('浏览器不支持GeoLocation!');
}
} // 获取成功
function onSuccess(position){
// 经度
var longitude =position.coords.longitude; // 纬度
var latitude = position.coords.latitude; // 使用百度地图API创建地图实例
var map =new BMap.Map("container"); // 创建一个坐标
var point =new BMap.Point(longitude,latitude); // 地图初始化，设置中心点坐标和地图级别
map.centerAndZoom(point, 16); // 设置标注的图标,可自己定义图标
var icon = new BMap.Icon("http://api.map.baidu.com/img/markers.png", new BMap.Size(23, 25), {
offset: new BMap.Size(10, 25), // 定位图标尺寸
imageOffset: new BMap.Size(0, 0 - 11 * 25) // 设置图片偏移
});
// 设置标注的经纬度
var marker = new BMap.Marker(new BMap.Point(longitude,latitude),{icon:icon}); // 把标注添加到地图上
map.addOverlay(marker); // 设置点击事件
marker.addEventListener("click", function(){
alert("经度:" + longitude + ", 纬度:" + latitude);
});
} // 获取失败
function onError(error){
switch(error.code){ case 1:
alert("位置服务被拒绝"); break; case 2:
alert("暂时获取不到位置信息"); break; case 3:
alert("获取信息超时"); break; case 4:
alert("未知错误"); break;
}
}
window.onload = getLocation;</script></head><body>
<p id="container" style="width:640px;height:640px"></p></body></html>
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