地理位置导出纬度和经度

时间:2018-07-19 10:16:01

标签: javascript geolocation

我正在使用两个功能,第一个是使用地理位置API,我想返回lat和lng

在第二个函数中,我想使用此坐标来获取一些数据 但是我无法在第一个功能上正确导出它。

我得到geolocationData()不是函数。

这是我的代码

const geolocationData = () => {
    return navigator.geolocation.getCurrentPosition((position) => {
        return position
    }, () => {
        alert('Unable to fetch your location')
    }, { enableHighAccuracy: true })
}

const gpsLocation = async () => {

    const lat = geolocationData().position.coords.latitude
    const lng = geolocationData().position.coords.longitude

    const address = await fetch(`https://maps.googleapis.com/maps/api/geocode/json?latlng=${lat},${lng}&result_type=administrative_area_level_4&key=0000000000000000`)
    const weatherData = await fetch(`https://cors-anywhere.herokuapp.com/https://api.darksky.net/forecast/0000000000000/${lat},${lng}?units=si&extend=hourly&exclude=flags&lang=el`)

    return {
        address: address.json(),
        weatherData: weatherData.json()
    }
}

1 个答案:

答案 0 :(得分:0)

这是因为getCurrentPosition的工作方式与您预期的不同,因为它不会直接返回latlong

让我重构一下代码。

我将通过创建一个可以解决当前地理坐标的诺言并在您的主要gpsLocation函数中调用此诺言来实现这一目标。由于您使用的是async/await,因此我也会保持这种状态。 总体而言,它看起来像这样:

//  a promise that resolves with geo coordinates
const getPosition = (options) => {
  return new Promise(function (resolve, reject) {
    navigator.geolocation.getCurrentPosition(resolve, reject, options);
  });
}

const gpsLocation = async () => {

    try {

        // calling the promise and awaiting the position object
        const geolocationData = await getPosition({ enableHighAccuracy: true });

        // destructruing the coordinates from the object
        const {latitude: lat, longitude: lng} = geolocationData.coords;

        // creating promises for each api call
        const addressPromise = fetch(`https://maps.googleapis.com/maps/api/geocode/json?latlng=${lat},${lng}&result_type=administrative_area_level_4&key=0000000000000000`)
        const weatherDataPromise = fetch(`https://cors-anywhere.herokuapp.com/https://api.darksky.net/forecast/0000000000000/${lat},${lng}?units=si&extend=hourly&exclude=flags&lang=el`);

        // wating for the promises to be resolved in parallel (rather than one after another)
        const [address, weatherData] = await Promise.all([addressPromise, weatherDataPromise]);

        return {
            address: address.json(),
            weatherData: weatherData.json()
        }

    } catch(e) {
        alert('Unable to fetch your location')
    }


}

这是如何使用它:

(async () => {

    const { address, weather } = await gpsLocation();

    console.log(address);
    console.log(weather);

})();

让我知道上述对您有用的方法;)