Question

您好我正在实施一个observable来获取我的技能api，我现在有一个问题，即映射所请求的数据。我的数组在请求结束时保持为null，我认为我的问题在于extractData（）。

这是我的服务：

import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import { Skill } from './skill';

@Injectable()
export class CatalogService {
    private api = 'http://127.0.0.1:8000/api/';
    constructor(private http: Http) {}

    getSkill(): Observable<Skill[]> {
        return this.http.get(this.api + "skill")
            .map(this.extractData)
            .catch(this.handleError);
    }

    private extractData(res: Response) {
        let body = res.json();
        return body.data || {};
    }

    private handleError(error: Response | any) {
        // In a real world app, you might use a remote logging infrastructure
        let errMsg: string;
        if (error instanceof Response) {
            const body = error.json() || '';
            const err = body.error || JSON.stringify(body);
            errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
        } else {
            errMsg = error.message ? error.message : error.toString();
        }
        console.error(errMsg);
        return Observable.throw(errMsg);
    }
}

这是我的.ts，我称之为服务

import { Component, OnInit } from '@angular/core';
import {CatalogService} from './catalog.service';
import {Skill} from './skill';
@Component({
    selector: 'app-catalog',
    templateUrl: './catalog.component.html',
    styleUrls: ['./catalog.component.css']
})
export class CatalogComponent implements OnInit {
    skills:Skill[];
    errorMessage:string;
    mode = 'Observable';
    constructor(private catalogService: CatalogService) { }

    ngOnInit() {
        this.getSkill();
    }
    getSkill() {
        this.catalogService.getSkill()
            .subscribe(
                skills => this.skills =skills,
                error =>  this.errorMessage = <any>error);
    }
}

这是我的api技能返回的结果：

[
    {
        "id": 2,
        "experience": "null",
        "typeskill": 1,
        "profile": 2
    },
    {
        "id": 3,
        "experience": "null",
        "typeskill": 1,
        "profile": 3
    }
]

我很感谢帮助解决这个问题。

Answer 1

我解决了将我的服务中的函数getSkill（）更改为：

getSkill(): Observable<Response> {
        return this.http.get(this.api + "skill")            
            .catch(this.handleError);
    }

.ts文件到此：

 getSkill() {
    this.catalogService.getSkill()
                     .subscribe(
                       res => this.skills =res.json(),
                       error =>  this.errorMessage = <any>error);
  }

angular2中的api请求的可观察量

1 个答案: