[英]angular2 http.get() doesn't send request to the server
我正试图从我的角度应用程序对localhost执行一个get请求到我的api。 但由于某种原因,角度http客户端似乎不执行get请求。
我可以在我的api服务器上看到没有得到请求。 这导致了错误。 api工作正常我试着做一个卷曲,我得到了预期的结果。
EXCEPTION:未捕获(在promise中):TypeError:无法读取未定义的属性'subscribe'
api.service
import { Injectable } from '@angular/core';
import { Headers, Http, Response, URLSearchParams, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs/Rx';
@Injectable()
export class ApiService {
headers: Headers = new Headers({
'Accept': 'application/json',
'Content-Type': 'application/json'
});
api_url: string = 'http://localhost:5001';
constructor(private http: Http) { }
private getJson(response: Response) {
return response.json().results;
}
checkForError(response: Response): Response {
if (response.status >= 200 && response.status < 300) {
return response;
} else {
var error = new Error(response.statusText);
error['response'] = response;
Observable.throw(error);
}
}
get(path: string, params: URLSearchParams): Observable<any> {
return this.http
.get(`${this.api_url}${path}/`, { headers: this.headers })
.map(this.checkForError)
.catch(err => Observable.throw(err))
.map(this.getJson);
}
api.component.ts
import { Component, OnInit } from "@angular/core";
import { ApiService } from './api.service';
@Component({
selector: 'item',
templateUrl: './item.component.html'
})
export class ItemComponent implements OnInit {
private itemData;
private errorAlert;
constructor(private apiService: ApiService) {}
ngOnInit() {
this.apiService.get('/items').subscribe(
result => this.itemData = result,
error => this.errorAlert = {msg: error, type: 'danger', closable: true},
);
}
}
也许您应该尝试回溯(或转发)问题:
从...开始:
this.http.get('/my/hardcoded/url').subscribe();
问题可能出在标题或插入的URL或任何地方。
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