最终结果应存储在下面的locations
数组中。
const locations = []
我创建了一个异步函数,该函数接受一个location
参数,然后locationSearch
将使用该参数向Google Places发出GET请求。
const locationSearch = await (
axios.get(`https://maps.googleapis.com/maps/api/place/textsearch/json?query=${location}`, {json: true})
.then(response => {
if(response.data.results.length < 1) throw new Error('Unable to find location.')
return response.data.results
}).catch(error => {
return error
})
)
结果返回一个位置数组,然后我将使用locationSearch
传递到place_id
以获取更多详细信息。
const locationDetails = await locationSearch.map(async (locationData) => {
const { place_id: id } = locationData
await (
axios.get(`https://maps.googleapis.com/maps/api/place/details/json?placeid=${id}`, {json: true})
.then(locationDetails => {
if(locationDetails.data.result.length === 0) throw new Error('Unable to find location ID!')
const { name, geometry, types, photos, rating, user_ratings_total, opening_hours, icon, formatted_address, formatted_phone_number, price_level, reviews } = locationDetails.data.result
locations.push({
latitude: geometry.location.lat,
longitude: geometry.location.lng,
types,
reviews,
photos,
rating,
user_ratings_total,
opening_hours,
icon,
name,
location: formatted_address,
formatted_phone_number,
price_level
})
}).catch(error => {
return error
})
)
})
但是,我不确定应该返回哪里,因为locationDetails
仅用于将结果映射到locations
中。已解决的Promise返回如下:
return Promise.all(locationSearch, locationDetails)
我希望这个问题不会这么愚蠢。此外,对于所编写代码的错误有任何反馈或指点,我们将不胜感激!
答案 0 :(得分:1)
使用异步/等待,您无需使用诸如.then
和.catch
之类的Promise API,这是使用Promise结构的替代方法。它应该看起来像这样:
async function getLocationData (location) {
try {
const { data } = axios.get(
`https://maps.googleapis.com/maps/api/place/textsearch/json?query=${location}`,
{ json: true }
)
if (data.results) {
const locationDetails = await Promise.all(
data.results.map(({ place_id }) =>
// for each of these, catch any errors and return null so you know you got nothing
// but it won't kill the entire batch of requests
axios.get(
`https://maps.googleapis.com/maps/api/place/details/json?placeid=${id}`,
{ json: true }
).catch(() => null)
)
)
return locationDetails.reduce((arr, details) => {
// only add the data if it exists
if (Array.isArray(details.result) && details.result.length) {
const {
name,
geometry,
types,
photos,
rating,
user_ratings_total,
opening_hours,
icon,
formatted_address,
formatted_phone_number,
price_level,
reviews
} = details
return [
...arr,
{
latitude: geometry.location.lat,
longitude: geometry.location.lng,
types,
reviews,
photos,
rating,
user_ratings_total,
opening_hours,
icon,
name,
location: formatted_address,
formatted_phone_number,
price_level
}
]
}
// otherwise it's an errored result (null) or no match
// so return the accumulated array (essentially a filter)
return arr
}, [])
} else {
throw new Error('Unable to find location')
}
} catch (err) {
return err
}
}
这里要注意的主要事情是,Promise.all
将在任何请求失败后立即停止。因此,您可以向.catch
映射中的每个axios调用添加Promise.all
,以防止整个批次被拒绝。然后,您将得到一个与定位结果数量匹配的数组,并且现在将得到失败的数组,因为它们将是null
,或者您想为失败的请求返回的内容。
此外,保持一致的错误处理方式也是一个好主意。要么一直扔,要么一直返回。