Geolocation capture error - Async Await
How can I catch a specific geolocation error to notify the user to enable geolocation?
The trap logs an error named PositionError as stated here in the Mozilla docs https://developer.mozilla.org/en-US/docs/Web/API/PositionError ".
* Note: my code doesn't catch the error, it just displays:
Uncaught (in promise) ReferenceError: PositionError is not defined
code
getCurrentLocation() {
return new Promise((resolve, reject) => {
navigator.geolocation.getCurrentPosition(resolve, reject, {
enableHighAccuracy: true,
timeout: 5000,
maximumAge: 0
});
});
},
async inout() {
try {
let location = await this.getCurrentLocation();
let response = await axios.post(API.URL, {});
} catch (e) {
if(e instanceof PositionError) {
console.log('position error')
}
}
}
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The API getCurrentPosition()
was poorly designed with the expectation that users would immediately check for errors in the callback instead of passing them.
Since it PositionError
does not have a public constructor, it is window.PositionError
not defined.
As Fabian mentions in the comments, you can test the error like this:
if (e.toString() == '[object PositionError]') {
console.log('position error')
}
or use a version of it if you're calling any API that might throw non-object errors (hopefully rare).
However, instead of cluttering your code, I recommend adding a better bug from your new async API instead getCurrentLocation()
(use fiddle to get around the SO snippet sandbox):
function getCurrentLocation(options) {
return new Promise((resolve, reject) => {
navigator.geolocation.getCurrentPosition(resolve, ({code, message}) =>
reject(Object.assign(new Error(message), {name: "PositionError", code})),
options);
});
};
async function inout() {
try {
console.log(await this.getCurrentLocation({
enableHighAccuracy: true,
timeout: 5000,
maximumAge: 0
}));
} catch (e) {
if (e.name == 'PositionError') {
console.log(e.message + ". code = " + e.code);
}
}
}
inout().catch(e => console.log(e)); // User denied geolocation prompt. code = 1
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