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沒有數據,我下面的教程角步驟7 hereAngular.io教程HeroService負荷InMemoryDataService
我HeroService
調用getHeroes()
返回時,沒有英雄。但我認爲它應該返回in-memory-data.service.ts
中定義的模擬數據。應該如何糾正它?
我沒有找到解決方案,
- 試圖改變
heroesUrl
到app/heroes
- 試圖通過
npm install angular-in-memory-web-api --save
重裝angular-in-memory-web-api
(當前安裝的版本"angular-in-memory-web-api": "^0.5.0"
)
我的代碼如下:
app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule} from '@angular/forms';
import { HttpModule } from '@angular/http';
import { AppRoutingModule } from './app-routing.module';
// Imports for loading & configuring the in-memory web api
import { InMemoryWebApiModule } from 'angular-in-memory-web-api';
import { InMemoryDataService } from './in-memory-data.service';
import { AppComponent } from './app.component';
import { HeroDetailComponent} from './hero-detail.component';
import { HeroesComponent } from './heroes.component';
import { DashboardComponent } from './dashboard.component';
import { HeroService } from './hero.service';
@NgModule({
declarations: [
AppComponent,
HeroDetailComponent,
HeroesComponent,
DashboardComponent
],
imports: [
BrowserModule,
FormsModule,
HttpModule,
InMemoryWebApiModule.forRoot(InMemoryDataService),
AppRoutingModule
],
providers: [HeroService],
bootstrap: [AppComponent]
})
export class AppModule { }
內存,data.service.ts
import { InMemoryDbService } from 'angular-in-memory-web-api';
export class InMemoryDataService implements InMemoryDbService {
createDb() {
const heroes = [
{ id: 0, name: 'Zero' },
{ id: 11, name: 'Mr. Nice' },
{ id: 12, name: 'Narco' },
{ id: 13, name: 'Bombasto' },
{ id: 14, name: 'Celeritas' },
{ id: 15, name: 'Magneta' },
{ id: 16, name: 'RubberMan' },
{ id: 17, name: 'Dynama' },
{ id: 18, name: 'Dr IQ' },
{ id: 19, name: 'Magma' },
{ id: 20, name: 'Tornado' }
];
return {heroes};
}
}
hero.service.ts
import { Injectable } from '@angular/core';
import { Headers, Http } from '@angular/http';
import { Hero } from './hero';
import 'rxjs/add/operator/toPromise';
@Injectable()
export class HeroService {
private heroesUrl = 'api/heroes';
constructor(private http: Http) {}
getHeroes(): Promise<Hero[]> {
console.log('in getheroes');
return this.http.get(this.heroesUrl)
.toPromise()
.then(response => response.json().data as Hero[])
.catch(this.handleError);
}
private handleError(error: any): Promise<any> {
console.error('An error occurred', error);
return Promise.reject(error.message || error);
}
getHero(id: number): Promise<Hero> {
return this.getHeroes().then(heroes => heroes.find(hero => hero.id === id));
}
}
更新:
問題根據@federico scamuzzi的建議解決。
更改.then(response => response.json().data as Hero[])
至.then(response => response.json() as Hero[])
修復它。
顯示你的代碼。 –
@federicoscamuzzi感謝您的快速響應,抱歉,編輯器在我試圖將我的代碼作爲圖片上傳時,打擾了我很多,所以最終更改爲文本格式。但是代碼屏幕截圖仍然可以在這裏找到:[2]:https://i.stack.imgur.com/uMleS.png [3]:https://i.stack.imgur.com/P0HY0.png [4] :https://i.stack.imgur.com/qGN8l.png – vancexu
嗨..你有沒有嘗試不使用.data?例如.then(response => response.json()as Hero [])或您使用的是哪個版本的Angular?在最新版本中,http提供程序在Httpclient –