HTML5 Geolocation object

Flash is embedded type, as long as it can run, then in its own virtual machine does not exist the compatibility problem, only the version of the problem; and Player Flash version update rate adopt has always been very high. This is a lot of trouble for developers. Browser compatibility html5 website templates the most headache is uneven, this is the stage of HTML5 the biggest mishap. But HTML5 also has an obvious advantage on the platform, it is more and more important on the mobile platform, HTML5 support is many (iOS support almost all of the html5 mobile template free download and the CSS3 attribute, most mobile browsers are HTML5 support good WebKit kernel), compared with Flash in iOS directly out. Is a mishap. In the long run, HTML5 Geolocation object is the absolute winner, because the browser support will become better and better, and the mobile platform Flash has no competition, Adobe has recently announced the development of a mobile platform to stop Flash Player. http://www.html5website.com/smartadmin-responsive-webapp-free-download-1-8-2-html5/

HTML5 Geolocation

This article is reproduced from http://www.html5website.com/html5-geolocation/
http://www.html5website.com/html5-geolocation/ 


HTML5 Geolocation
HTML5 Geolocation is used to locate the user’s position.
HTML5 Geolocation API is used to get the the user’s positon
Considering that the feature may involve invasion of privacy, the user’s position information is unavailable unless consented by users.
browser support
Internet Explorer 9+, Firefox, Chrome, Safari and Opera support Geolocation.
Note: . Geolocation is more accurate on the device with GPS function, such as Iphone.
Use of Geolocation.
Please use getCurrentPosition() to get the user’s position.
The following is a simple geolocation example. You can go back to the longitude and latitude of the user’s position.

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<script> var x=document.getElementById("demo"); function getLocation()   {   if (navigator.geolocation)     {     navigator.geolocation.getCurrentPosition(showPosition);     }   else{x.innerHTML="The browser does not support";}   } function showPosition(position)   {   x.innerHTML="Latitude: " + position.coords.latitude +   " Longitude: " + position.coords.longitude;   } </script>

Example analysis

• detect whether it supports geolocation or not.
• If it supports,just run getCurrentPosition(). If not support, a message will show to users.
• . If getCurrentPosition() runs successfully, it returns a coordinates object to the function specified in the …
• showPosition() function retrieves and displays the latitude and longitude
• The second parameter of getCurrentPosition() method is used to handle errors. It specifies the function when failing to get user’s position.
• 
  

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function showError(error)   {   switch(error.code)     {     case error.PERMISSION_DENIED:       x.innerHTML="The user refused to get the geographic location of the request"       break;     case error.POSITION_UNAVAILABLE:       x.innerHTML="Location information is not available."       break;     case error.TIMEOUT:       x.innerHTML="time out       break;     case error.UNKNOWN_ERROR:       x.innerHTML="error"       break;     }   }

error code:
Permission denied
Position unavailable
Timeout
If you need to show result in the map, you need to visit the map service with longitude and latitude, such as Google Map or Baidu Map
show result in the map

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</pre> <div>function showPosition(position) { var latlon=position.coords.latitude+","+position.coords.longitude;</div> <div></div> <div>var img_url="http://maps.googleapis.com/maps/api/staticmap?center=" +latlon+"&zoom=14&size=400x300&sensor=false";</div> <div></div> <div>document.getElementById("mapholder").innerHTML="<img src='"+img_url+"'>"; }</div> <pre>

In the above example, we use the retrieved longitude and latitude date to show location in Google Map.( use static image)
The above link shows how to use script to display interactive map with options of markers, zoom in and out and drag.
The page shows how to display a user’s locaton on a map. While, the geolocation is also very useful for the information about a given location.
Example:
Update local information
Display interesting spots around users
GPS
getCurrentPosition() Return
If getCurrentPosition() method is successful, it returns an object to the function. It will always return latitude, longitude and accuracy attribute.
If the method can be used, it can return the following attributes

coords.latitude	latitude of decimal number
coords.longitude	longitude of decimal number
coords.accuracy	accuracy of location
coords.altitude	altitude, measured in meters above sea level.
coords.altitudeAccuracy	altitude accuracy of location
coords.heading	direction, measured in degree from the north
coords.speed	speed, measured in m/s
timestamp	responding date/time

Geolocation object-other interesting methods
watchPosition() -return to user’s current location, and continue to return to the latest location when the user moves.( just like the GPS of a car)
clearWatch() – stop watchPosition() method
The following example shows the watchPosition() method. You need a accurate GPS device (e.g. iPhone ) to test the example.

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<script> var x=document.getElementById("demo"); function getLocation()   {   if (navigator.geolocation)     {     navigator.geolocation.watchPosition(showPosition);     }   else{x.innerHTML=" browser does not support";}   } function showPosition(position)   {   x.innerHTML=" latitude: " + position.coords.latitude +   "  longitude: " + position.coords.longitude;   } </script>  This article is reproduced from http://www.html5website.com/html5-geolocation/ http://www.html5website.com/html5-geolocation/

HTML5 test

The Internet is a shift in the world, in order to adapt to the change of The Times, also changes into their own in the W3C, is out of line in the Internet use, hypertext logo mark whatever logo. Here now is a new version of the HTML5 Geolocation version 5, from the beginning of the simple HTML5 test evolved for collection and the language of the scale of the language, has walked for a change or update, now it is in the fifth edition. Take up the problem is that all these changes can have a HTML 5 in search engine optimization (seo) to the end?