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H5 of 11__GeoLocation Geolocation

黄舟Original: 2017-02-18 14:54:191640browse

GeoLocation API is usually used for mobile devices to obtain geographical location. Strictly speaking, it does not belong to the standard specification of H5.

1 How to use GeoLocation API ?

To use this API, obtain access to geolocation through window.navigator.geolocatio. This object has the following three methods:

1. getCurrentPosition()

2. watchPosition()

3. clearWatch()

The getCurrentPosition() method can pass three parameters, as shown below:

void getCurrentPosition(PositionCallback successCallback, optional PositionErrorCallback errorCallback, optional PositionOptions options);

The first one The first parameter is a required parameter, and the last two are optional parameters.

Look at an example:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
    <title>GeoLocation API 地理定位</title>
    <script type="text/javascript">
    	
   		
   		window.navigator.geolocation.getCurrentPosition(function(pos){
   			alert("当前地理位置的纬度： " +pos.coords.latitude
   			+"\n当前地理位置的经度： " +pos.coords.longitude
   			+ "\n当前经纬度的精度： " +pos.coords.accuracy
   			+ "\n设备的当前运动方向： " +pos.coords.heading
   			+ "\n设备的当前速度： " +pos.coords.speed
   			);
   			
   		});
   		
   		var watchID= window.navigator.geolocation.watchPosition(function(pos){
   			alert("当前位置变化的纬度： " +pos.coords.latitude
   			+"\n当前位置变化的经度： " +pos.coords.longitude
   			+ "\n当前经纬度变化的精度： " +pos.coords.accuracy
   			+ "\n设备的当前运动方向： " +pos.coords.heading
   			+ "\n设备的当前变化的速度： " +pos.coords.speed);
   			
   			navigator.geolocation.clearWatch(watchID);
   		}, function(){
   		});
    </script>
</head>
<body>
	
</body>
</html>

After calling getCurrentPosition() successfully, In the callback function, you can obtain the geographical location information of the current user when accessing the Web page through the parameter object.

#pos object contains a coords attribute. The coords attribute Represents a series of geographical coordinate information.

latitude: latitude (decimal)

longitude: longitude (decimal)

altitude: altitude

acuracy: the accuracy of latitude and longitude coordinates (in meters)

altitudeAccuracy: in meters The altitude coordinate accuracy level

heading: Direction of movement (specified by the angle of clockwise rotation relative to true north)

speed: current Ground speed (in m/s)

pos also contains a timestamp attribute, which is used to create a timestamp in milliseconds when returning the coords object.

The rendering is as follows:

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