【发布时间】：2017-09-27 17:34:49
【问题描述】：
我想将我的 web 应用程序连接到 firebase，并且我有 VPN，但是运行后，我的仪表板组件没有显示并且有一些错误：
发生错误：响应 app/hero.service.js:57 错误错误：node_modules/@angular/core/bundles/core.umd.js:1091 未捕获（承诺中）：响应状态：404 Not Found for URL： https://myfirebase 数据库名称/.json
这是我的代码： 仪表板组件：
import { Component, OnInit } from '@angular/core';
import {Http} from '@angular/http';
import { Hero } from './hero';
import { HeroService } from './hero.service';
@Component({
selector: 'my-dashboard',
templateUrl: './dashboard.component.html',
styleUrls: [ './dashboard.component.css' ]
})
export class DashboardComponent implements OnInit {
heroes: Hero[] = [];
constructor(private heroService: HeroService) { }
ngOnInit(): void {
this.heroService.getHeroes()
.then(heroes => this.heroes = heroes.slice(1, 5));
}
}
hero.service.ts
import { Injectable } from '@angular/core';
import { Headers, Http } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { Hero } from './hero';
@Injectable()
export class HeroService {
private headers = new Headers({'Content-Type': 'application/json'});
private heroesUrl = private heroesUrl = "https://tour-of-heroes-bcc7b.firebaseio.com/.json"; // URL to web api
constructor(private http: Http) { }
getHeroes(): Promise<Hero[]> {
return this.http.get(this.heroesUrl)
.toPromise()
.then(response => response.json().data as Hero[])
.catch(this.handleError);
}
getHero(id: number): Promise<Hero> {
const url = `${this.heroesUrl}/${id}`;
return this.http.get(url)
.toPromise()
.then(response => response.json().data as Hero)
.catch(this.handleError);
}
delete(id: number): Promise<void> {
const url = `${this.heroesUrl}/${id}`;
return this.http.delete(url, {headers: this.headers})
.toPromise()
.then(() => null)
.catch(this.handleError);
}
create(name: string): Promise<Hero> {
return this.http
.post(this.heroesUrl, JSON.stringify({name: name}), {headers: this.headers})
.toPromise()
.then(res => res.json().data as Hero)
.catch(this.handleError);
}
update(hero: Hero): Promise<Hero> {
const url = `${this.heroesUrl}/${hero.id}`;
return this.http
.put(url, JSON.stringify(hero), {headers: this.headers})
.toPromise()
.then(() => hero)
.catch(this.handleError);
}
private handleError(error: any): Promise<any> {
console.error('An error occurred', error); // for demo purposes only
return Promise.reject(error.message || error);
}
}
index.html
<!DOCTYPE html>
<html>
<head>
<base href="/">
<title>Angular Tour of Heroes</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="styles.css">
<!-- Polyfills -->
<script src="node_modules/core-js/client/shim.min.js"></script>
<script src="node_modules/zone.js/dist/zone.js"></script>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<script src="systemjs.config.js"></script>
<script>
System.import('main.js').catch(function(err){ console.error(err); });
</script>
<body>
<my-app>Loading...</my-app>
<script src="https://www.gstatic.com/firebasejs/3.9.0/firebase.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.9.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.9.0/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.9.0/firebase-database.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.9.0/firebase-messaging.js"></script>
<script>
// Initialize Firebase
var config = {
apiKey: "my firebase project apikey",
authDomain: "my firebase projec domain name",
databaseURL: "my firebase projec database name",
projectId: "my firebase projec ID",
storageBucket: "my firebase projec storage",
messagingSenderId: "my firebase projec senderId"
};
firebase.initializeApp(config);
</script>
</head>
</body>
</html>
app.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
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 { DashboardComponent } from './dashboard.component';
import { HeroesComponent } from './heroes.component';
import { HeroDetailComponent } from './hero-detail.component';
import { HeroService } from './hero.service';
import { HeroSearchComponent } from './hero-search.component';
@NgModule({
imports: [
BrowserModule,
FormsModule,
HttpModule,
InMemoryWebApiModule.forRoot(InMemoryDataService),
AppRoutingModule
],
declarations: [
AppComponent,
DashboardComponent,
HeroDetailComponent,
HeroesComponent,
HeroSearchComponent
],
providers: [ HeroService ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
【问题讨论】：
-
问题出在这里-
private heroesUrl = "https://my firebase database name/.json"; -
这里应该是您在 firebase 中的数据库的真实网址
-
非常感谢。我真正的鳕鱼是：私人英雄Url = "tour-of-heroes-bcc7b.firebaseio.com/.json";但它不起作用。
标签： javascript json node.js angular firebase