آموزش html5

geolocation & web sql in html

سلام
در بخش چهل و دوم آموزش HTML5 در مورد web sql وgeolocation صحبت می کنیم.
از geolocation برای نشان دادن محل بازدید کاربر استفاده می شود که هم می توان به صورت طول و عرض جغرافیایی و هم می توان به صورت نقشه نمایش داد.

Locate the User’s Position
The HTML Geolocation API is used to get the geographical position of a user.
Since this can compromise privacy, the position is not available unless the user approves it.
Note: Geolocation is most accurate for devices with GPS, like iPhone.
Using HTML Geolocation
The getCurrentPosition() method is used to get the user’s position.
The example below returns the latitude and longitude of the user’s position:
Check if it is supported
If supported, run the getCurrentPosition() method. If not, display a message to the user
If the getCurrentPosition() method is successful, it returns a coordinates object to the function specified in the parameter (showPosition)
The showPosition() function outputs the Latitude and Longitude

The example above is a very basic Geolocation script, with no error handling.
Displaying the Result in a Map
To display the result in a map, you need access to a map service, like Google Maps.
In the example below, the returned latitude and longitude is used to show the location in a Google Map (using a static image):
Location-specific Information
This page has demonstrated how to show a user’s position on a map.
itis also very useful for location-specific information, like:
Up-to-date local information
Showing Points-of-interest near the user
Turn-by-turn navigation (GPS)
The getCurrentPosition() Method – Return Data
The getCurrentPosition() method returns an object if it is successful. The latitude, longitude and accuracy properties are always returned. The other properties are returned if available:

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