You are developing a website that helps users locate theaters in their area from a browser. You created a function named findTheaters ().
The function must:
Get the current latitude and longitude of the users device
Pass the users location to findTheaters()
The user needs to access the geolocation information from the browser before searching for theaters.
Which code segment should you use?
A. Option A
B. Option B
C. Option C
D. Option D
Explanation:
* The getCurrentPosition method retrieves the current geographic location of the device. The location is expressed as a set of geographic coordinates together with information about heading and speed. The location information is returned in a Position object.
syntax of this method:
getCurrentPosition(showLocation, ErrorHandler, options);
where
showLocation : This specifies the callback method that retrieves the location information. This method is called asynchronously with an object corresponding to the Position object which stores the returned location information.
ErrorHandler : Thisoptional parameter specifies the callback method that is invoked when an error occurs in processing the asynchronous call. This method is called with the PositionError object that stores the returned error information.
* e example below is a simple Geolocation example returning the latitude and longitude of the users position:
Example
<
script
>
var x = document.getElementById(-demo-);
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = -Geolocation is not supported by this browser.-;
}
}
function showPosition(position) {
x.innerHTML = -Latitude: – + position.coords.latitude +
–
<
br
>
Longitude: – + position.coords.longitude;
}
<
/script
>
Example explained:
Check if Geolocation 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 gets the displays the Latitude and Longitude
The example above is a very basic Geolocation script, with no error handling.
Reference: HTML5 Geolocation; Geolocation getCurrentPosition() API