Angular 角度RxJS合并贴图类型
正在尝试使用Angular 角度RxJS合并贴图类型,angular,typescript,http,Angular,Typescript,Http,正在尝试使用http.get请求URL将经度和纬度从地理位置服务拉入list.service 第一期: 类型“{}”上不存在业务属性“业务” 感谢您在这个问题上的帮助和时间 list.service.ts: import { Injectable } from '@angular/core'; import { Observable } from 'rxjs'; import { List } from '../models/list.model'; import { map } from 'r
http.get
请求URL将经度和纬度从地理位置服务拉入list.service
第一期:
类型“{}”上不存在业务属性“业务”
感谢您在这个问题上的帮助和时间
list.service.ts
:
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { List } from '../models/list.model';
import { map } from 'rxjs/operators';
import { GeolocationService } from '../services/geolocation.service';
import { mergeMap } from 'rxjs/operators';
import { HttpClient } from '@angular/common/http';
@Injectable()
export class ListService {
private serverApi = 'http://localhost:3000';
constructor(private http: HttpClient, private geoServ: GeolocationService) { }
public getAllLists(): Observable<List[]> {
return this.geoServ.getGeoLocation().pipe(
mergeMap<{businesses: List[]}>(({ latitude, longitude }) =>
this.http.get(`${this.serverApi}/yelp/${longitude}/${latitude}`).pipe(
)
),
map(res => res.businesses));
}
}
import { Injectable } from '@angular/core';
import { Observable, Subject, asapScheduler, pipe, of, from, interval, merge, fromEvent, SubscriptionLike, PartialObserver } from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class GeolocationService {
constructor() { }
getGeoLocation() {
return new Observable((observer) => {
console.log('Geolocation working!');
const options = {
enableHighAccuracy: true,
timeout: 5000,
maximumAge: 0
};
const success = (pos) => {
const crd = pos.coords;
console.log(`Longitude : ${crd.longitude}`);
const location = {
"latitude" : crd.longitude,
"longitude": crd.longitude
};
observer.next(location);
observer.complete();
};
const error = (err) => {
console.warn(`ERROR(${err.code}): ${err.message}`);
observer.error(err);
observer.complete();
};
navigator.geolocation.getCurrentPosition(success, error, options);
});
}
}
export interface List {
id: string;
name?: string;
rating?: number;
review_count?: number;
url?: string;
location: string;
display_name?: string;
image_url?: string;
is_closed?: boolean;
}
list.model.ts
:
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { List } from '../models/list.model';
import { map } from 'rxjs/operators';
import { GeolocationService } from '../services/geolocation.service';
import { mergeMap } from 'rxjs/operators';
import { HttpClient } from '@angular/common/http';
@Injectable()
export class ListService {
private serverApi = 'http://localhost:3000';
constructor(private http: HttpClient, private geoServ: GeolocationService) { }
public getAllLists(): Observable<List[]> {
return this.geoServ.getGeoLocation().pipe(
mergeMap<{businesses: List[]}>(({ latitude, longitude }) =>
this.http.get(`${this.serverApi}/yelp/${longitude}/${latitude}`).pipe(
)
),
map(res => res.businesses));
}
}
import { Injectable } from '@angular/core';
import { Observable, Subject, asapScheduler, pipe, of, from, interval, merge, fromEvent, SubscriptionLike, PartialObserver } from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class GeolocationService {
constructor() { }
getGeoLocation() {
return new Observable((observer) => {
console.log('Geolocation working!');
const options = {
enableHighAccuracy: true,
timeout: 5000,
maximumAge: 0
};
const success = (pos) => {
const crd = pos.coords;
console.log(`Longitude : ${crd.longitude}`);
const location = {
"latitude" : crd.longitude,
"longitude": crd.longitude
};
observer.next(location);
observer.complete();
};
const error = (err) => {
console.warn(`ERROR(${err.code}): ${err.message}`);
observer.error(err);
observer.complete();
};
navigator.geolocation.getCurrentPosition(success, error, options);
});
}
}
export interface List {
id: string;
name?: string;
rating?: number;
review_count?: number;
url?: string;
location: string;
display_name?: string;
image_url?: string;
is_closed?: boolean;
}
添加了
model.ts
以帮助澄清似乎您仍在使用旧的angular http客户端。这也不适合打字。要修复键入问题,请向mergeMap
generic参数添加类型对象
public getAllLists(): Observable<List[]> {
return this.geoServ.getGeoLocation().pipe(
mergeMap<{latitude: string, longitude: string}, {businesses: List[]}>(({ latitude, longitude }) =>
this.http.get(`${this.serverApi}/yelp/${longitude}/${latitude}`).pipe(
map(res => res.json()), // remove after updating to new http client
)
),
map(res => res.businesses));
}
public GetAllList():可观察{
返回此.geoServ.getGeoLocation()管道(
合并地图({纬度,经度})=>
this.http.get(`${this.serverApi}/yelp/${longitude}/${latitude}`).pipe(
map(res=>res.json()),//更新到新http客户端后删除
)
),
地图(res=>res.business));
}
您的代码说GET返回一个列表[]
,但是数组没有业务属性,这就是它抱怨的原因。您可以使用:
public getAllLists(): Observable<List[]> {
return this.geoServ.getGeoLocation().pipe(
mergeMap(({ latitude, longitude }) =>
this.http.get<any>(`${this.serverApi}/yelp/${longitude}/${latitude}`)
),
map(res => res.businesses));
}
public GetAllList():可观察{
返回此.geoServ.getGeoLocation()管道(
合并地图({纬度,经度})=>
this.http.get(`this.serverApi}/yelp/${longitude}/${latitude}`)
),
地图(res=>res.business));
}
这将进行编译,但是如果响应确实是一个数组,Observable
可能最终发出undefined
getGeoLocation
不会返回任何内容,因此您需要在list.service.ts中返回您的ObservableThis.http.get(`${This.serverApi}/yelp/${longitude}/${latitude})
,(或者,如果您有响应类型的接口,请使用该接口而不是any
)通过复制/粘贴上面的代码,我可以看到一些错误,但是List[]
没有属性(虽然一个单独的列表
可能会出现这种情况,但考虑到这一点,它应该如何表现呢?我在下面添加了一个答案,这样应该会起作用。@jaimomencayo我很高兴你找到了解决方案,但是请-编辑问题标题,因为它太宽泛了。让它更具体地针对你的情况,以便帮助搜索引擎在res中显示你的问题。)结果正确。Thnx很抱歉,我现在更新了它和上面的代码!对于类型对象,我得到了错误:src/app/services/list.service.ts(19,11)中的错误:错误TS2558:需要2-3个类型参数,但得到了1.src/app/services/list.service.ts(23,26):错误TS2339:类型{}上不存在属性“business”“.@jaimomencayo我已经更新了我的答案。我忘了mergeMap有两个泛型类型。最好不要使用any
来维护类型安全