[英]httpClient request is called twice in angular4
我使用httpClient在我的angular4應用程序中調用了API,但是該API被調用了兩次,第一個調用方法是OPTIONS,第二個調用方法是Get。
Component.ts: -
import { Component, OnInit, ViewEncapsulation } from '@angular/core';
import { UserService } from './Services/User.service';
@Component({
selector: 'user-component',
templateUrl: './user-component.component.html',
styleUrls: ['./user-component.component.scss'],
encapsulation: ViewEncapsulation.None
})
export class UserComponent implements OnInit {
apiResponse : any;
status : any = 'active';
constructor(private service: UserService) { }
ngOnInit() {
this.getResult();
}
getResult()
{
this.service.getUser(this.status)
.subscribe(res => {this.apiResponse = res},
err => console.log(err),
() => console.log(this.apiResponse)
);
}
}
Component.html: -
<pre>{{apiResponse |json}}</pre>
User.service.ts: -
import { Injectable,Inject } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import 'rxjs/add/operator/map';
interface Response {
response : any;
}
@Injectable()
export class UserService {
apiUrl : any='http://localhost/MyProject/';
constructor( private http: HttpClient) {}
public getUser(status: any)
{
let httpParams = new HttpParams().set('status', status);
return this.http.get<Response>(this.apiUrl+"users", {params: httpParams}).map(response => response.response);
}
}
該API調用了兩次,請告訴我如何解決此問題?
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