错误：AngularJS 2中未处理的承诺拒绝

我正在构建一个Angular提供者，它使用http从电影数据库Api获取数据

但是，尽管如此，我在使用该提供商的页面中发现了以下错误：

因此，提供程序和页面的源代码为：

tmdb.ts

import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import {Observable} from 'rxjs/Rx';

@Injectable()

export class TMDB {
  apiUrl: string = "https://api.themoviedb.org/3";
  apiKey: string = "xxx";
  apiLang: string = "pt-BR";

  posterLargePath: string = "https://image.tmdb.org/t/p/w500_and_h281_bestv2";
  posterMiniPath: string = "https://image.tmdb.org/t/p/w116_and_h174_bestv2";

  constructor(public http: Http) {
  }

  getSearchMovie(query: string){
    let body = {"api_key":this.apiKey, "language":this.apiLang, "query":query, "include_adult": false};
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
        return this.http.get(this.apiUrl + "/search/movie?" + JSON.stringify(body), options)
            .map((res:Response) => res.json())
            .catch((error:any) => Observable.throw(error.json().error || 'Server error'))
    }

  getDiscoverMovies(){
    let body = {"api_key":this.apiKey, "language":this.apiLang, "page":1, "sort_by":"popularity.desc", "include_video": false, "include_adult": false};
        let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
     return this.http.get(this.apiUrl + "/discover/movie?" + JSON.stringify(body), options)
            .map((res:Response) => res.json())
            .catch((error:any) => Observable.throw(error.json().error || 'Server error'))
  }

  getPosterLargeUrl(){
    return this.posterLargePath;
  }

  getPosterMiniUrl(){
    return this.posterMiniPath;
  }

}

import { Component } from '@angular/core';
//import{ Http } from '@angular/http';
import { NavController } from 'ionic-angular';
//import 'rxjs/add/operator/map'
import { TMDB } from '../../providers/tmdb.ts';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
  //,providers: [TMDB]
})
export class HomePage {
  discoverMovies: any;
  posterMiniPath: string;
  posterLargePath: string;

  constructor(public navCtrl: NavController) {
    TMDB.getDiscoverMovies().subscribe(
                              movies => this.discoverMovies = movies, //Bind to view
                              err => {
                                  // Log errors if any
                                  console.log(err);
                              });
    this.posterMiniPath = TMDB.getPosterMiniUrl();
    this.posterLargePath = TMDB.getPosterLargeUrl();
  }

}

page.ts

import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import {Observable} from 'rxjs/Rx';

@Injectable()

export class TMDB {
  apiUrl: string = "https://api.themoviedb.org/3";
  apiKey: string = "xxx";
  apiLang: string = "pt-BR";

  posterLargePath: string = "https://image.tmdb.org/t/p/w500_and_h281_bestv2";
  posterMiniPath: string = "https://image.tmdb.org/t/p/w116_and_h174_bestv2";

  constructor(public http: Http) {
  }

  getSearchMovie(query: string){
    let body = {"api_key":this.apiKey, "language":this.apiLang, "query":query, "include_adult": false};
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
        return this.http.get(this.apiUrl + "/search/movie?" + JSON.stringify(body), options)
            .map((res:Response) => res.json())
            .catch((error:any) => Observable.throw(error.json().error || 'Server error'))
    }

  getDiscoverMovies(){
    let body = {"api_key":this.apiKey, "language":this.apiLang, "page":1, "sort_by":"popularity.desc", "include_video": false, "include_adult": false};
        let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
     return this.http.get(this.apiUrl + "/discover/movie?" + JSON.stringify(body), options)
            .map((res:Response) => res.json())
            .catch((error:any) => Observable.throw(error.json().error || 'Server error'))
  }

  getPosterLargeUrl(){
    return this.posterLargePath;
  }

  getPosterMiniUrl(){
    return this.posterMiniPath;
  }

}

import { Component } from '@angular/core';
//import{ Http } from '@angular/http';
import { NavController } from 'ionic-angular';
//import 'rxjs/add/operator/map'
import { TMDB } from '../../providers/tmdb.ts';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
  //,providers: [TMDB]
})
export class HomePage {
  discoverMovies: any;
  posterMiniPath: string;
  posterLargePath: string;

  constructor(public navCtrl: NavController) {
    TMDB.getDiscoverMovies().subscribe(
                              movies => this.discoverMovies = movies, //Bind to view
                              err => {
                                  // Log errors if any
                                  console.log(err);
                              });
    this.posterMiniPath = TMDB.getPosterMiniUrl();
    this.posterLargePath = TMDB.getPosterLargeUrl();
  }

}

我需要知道这就是问题所在。有人能帮我吗？记住我使用的是离子框架v。二,

编辑1:

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { TMDB } from '../../providers/tmdb.ts';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html',
  providers: [TMDB]
})
export class HomePage {
  discoverMovies: any;
  posterMiniPath: string;
  posterLargePath: string;

  constructor(public navCtrl: NavController, public tmdb: TMDB) {
    tmdb.getDiscoverMovies().subscribe(
                              movies => this.discoverMovies = movies,
                              err => {
                                  console.log(err);
                              });
    this.posterMiniPath = tmdb.getPosterMiniUrl();
    this.posterLargePath = tmdb.getPosterLargeUrl();
  }

}

编辑2:

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { TMDB } from '../../providers/tmdb.ts';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html',
  providers: [TMDB]
})
export class HomePage {
  discoverMovies: any;
  posterMiniPath: string;
  posterLargePath: string;

  constructor(public navCtrl: NavController, public tmdb: TMDB) {
    tmdb.getDiscoverMovies().subscribe(
                              movies => this.discoverMovies = movies,
                              err => {
                                  console.log(err);
                              });
    this.posterMiniPath = tmdb.getPosterMiniUrl();
    this.posterLargePath = tmdb.getPosterLargeUrl();
  }

}

app.module.ts：

import { NgModule } from '@angular/core';
import { IonicApp, IonicModule } from 'ionic-angular';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { PageIntro } from '../pages/intro/page';
import { TMDB } from '../providers/tmdb.ts';

@NgModule({
  declarations: [
    MyApp,
    HomePage,
    PageIntro
  ],
  imports: [
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage,
    PageIntro
  ],
  providers: [ TMDB ]
})
export class AppModule {}

tmdb.ts：

import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import {Observable} from 'rxjs/Rx';

/*
  Generated class for the TMDB provider.

  See https://angular.io/docs/ts/latest/guide/dependency-injection.html
  for more info on providers and Angular 2 DI.
*/
@Injectable()

export class TMDB {
  apiUrl: string = "https://api.themoviedb.org/3";
  apiKey: string = "xxxx";
  apiLang: string = "pt-BR";

  posterLargePath: string = "https://image.tmdb.org/t/p/w500_and_h281_bestv2";
  posterMiniPath: string = "https://image.tmdb.org/t/p/w116_and_h174_bestv2";

  constructor(public http: Http) {
  }

  getSearchMovie(query: string){
    let body = {"api_key":this.apiKey, "language":this.apiLang, "query":query, "include_adult": false};
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
        return this.http.get(this.apiUrl + "/search/movie?" + JSON.stringify(body), options)
            .map((res:Response) => res.json())
            .catch((error:any) => Observable.throw(error.json().error || 'Server error'))
    }

  getDiscoverMovies(){
    let body = {"api_key":this.apiKey, "language":this.apiLang, "page":1, "sort_by":"popularity.desc", "include_video": false, "include_adult": false};
        let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
     return this.http.get(this.apiUrl + "/discover/movie?" + JSON.stringify(body), options)
            .map((res:Response) => res.json())
            .catch((error:any) => Observable.throw(error.json().error || 'Server error'))
  }

  getPosterLargeUrl(){
    return this.posterLargePath;
  }

  getPosterMiniUrl(){
    return this.posterMiniPath;
  }

}

---

当它是一个实例方法时，您试图静态调用

TMDB.getDiscoveryMovies

。你应该做的。您应该做的是将其添加到

@NgModule.providers

，然后将其插入

主页

@NgModule({
  providers: [ TMDB ]
})
class AppModule {}

@Component({})
class HomePage {
  constructor(private tmdb: TMDB) {
    tmdb.getDiscoverMovies().subscribe(
        movies => this.discoverMovies = movies, //Bind to view
        err => console.log(err));
    this.posterMiniPath = tmdb.getPosterMiniUrl();
    this.posterLargePath = tmdb.getPosterLargeUrl();
  }
}

---

请注意，我们现在将

TMDB

用作实例，而不是静态使用。

您好，您的屏幕截图不可读。顺便说一句，请在主题中添加NgModule声明，它可能有用。另一方面，如果不注入服务，就不能使用TMDB服务。这可能是你的问题的原因。图像修复了，我按照你说的做了，但没有修复错误。你的屏幕截图证实了我的假设。在使用之前，必须先注入TMBD。你也必须在你的模块中处理它。下面的答案向您展示了正确的操作。我按照您所说的做了，但是我在

私有tmdb:tmdb

上遇到了这个错误：

找不到名称“tmdb”

，并且导出类的构造函数的

参数“tmdb”已经或正在使用私有名称“tmdb

。这是什么？您仍然需要从“../../providers/TMDB.ts”导入{TMDB}导入到类中，以便您可以使用它（在模块和组件类中），请选中Edit 2。确保您从正确的路径导入它，因为导入不需要扩展，所以：

import{TMDB}from'../../providers/TMDB'

。谢谢。