Stack Overflow Asked by user11965730 on December 22, 2021
I am new to async functions. What I currently have is watchPosition()
, which fires whenever a new position is detected. Well, what I need is to find a new speed every second. So, I want to call getCurrentPosition()
every second, to record the speed of the user. I get a big backlog when I use setInterval()
with getCurrentPosition()
.
What I want (time, speed):
1s, 1m/s
2s, 1.5m/s
3s, 1.2m/s...etc
What I get with setInterval and getCurrentPosition()
:
5s, 1m/s
5s, 1m/s
5s, 1m/s
10s, 1.5m/s
10s, 1.5m/s
10s, 1.5m/s...etc
With setInterval()
, the speeds are all the same and I get a barrage of them every 5seconds or so. So I am confused, how should I approach this? Use an observable?
–edit:
With watchPosition():
function getAverageWalkingSpeed():any {
var options = {
maximumAge: 1000,
timeout: 5000,
enableHighAccuracy : true,
};
let watch = navigator.geolocation.watchPosition(onSuccess, onError, options);
function onSuccess(position: { timestamp: string | number | Date; coords: { speed: any; latitude: any; longitude: any; }; }) {
let time = formatTime(new Date(new Date().getTime())); //time when speed was found
let speed = position.coords.speed;
console.log(time,speed)
})
}
With a setInterval function, replacing previous watchPosition()
with getCurrentPosition()
. Should just need to call setTimer(true):
function setTimer(state: boolean){
if(state){
var timer = setInterval(getAverageWalkingSpeed, 1000);
}
else{
clearInterval(timer)
}
}
You can create a wrapper function that awaits for getCurrentPosition, and then recursively calls itself after 1 second:
function mockGetCurrentPosition () {
return new Promise((resolve,reject)=> {
setTimeout(()=> resolve(console.log("x,y")),1000);
});
}
async function getPosition () {
await mockGetCurrentPosition();
setTimeout(()=> getPosition(), 1000);
}
getPosition();
Answered by Pavlos Karalis on December 22, 2021
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