Wait until a condition is true?

Question

I\'m using navigator.geolocation.watchPosition in JavaScript, and I want a way to deal with the possibility that the user might submit a form relying on locatio

Answer 1

Try using setInterval and clearInterval like this...

var current_latlng = null;

function gpsSuccess(pos) {
    //console.log('gpsSuccess');  
    if (pos.coords) {
        lat = pos.coords.latitude;
        lng = pos.coords.longitude;
    } else {
        lat = pos.latitude;
        lng = pos.longitude;
    }
    current_latlng = new google.maps.LatLng(lat, lng);
}
watchId = navigator.geolocation.watchPosition(gpsSuccess,
    gpsFail, {
        timeout: 5000,
        maximumAge: 300000
    });
$('#route-form').submit(function (event) {
    // User submits form, we need their location...
    // Checks status every half-second
    var watch = setInterval(task, 500)

    function task() {
        if (current_latlng != null) {
            clearInterval(watch)
            watch = false
            return callback()
        } else {
            toastMessage('Waiting for your location...');

        }
    }

    function callback() {
        // Continue on with location found...
    }
});