下面是我的组件文件和服务文件。我想要做的是在其成功回调上的after verification()服务方法,即在subscribe内部,我想调用另一个服务方法,即注册()。但是,它无法正常显示以下错误:
以前在 angular1 中,如果我这样做,它会起作用但不在这里:
sampleService.meth1().success(function(){
//statement1...
sampleService.meth1().success(function(data){
//statement2...
}).error(function(){})
}).error(function(){});
})
Signup.component.ts
import { Component, Input } from '@angular/core';
import { Router } from '@angular/router';
import {User} from '../shared/model/user';
import {SignupService} from './signup.service';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/distinctUntilChanged';
import 'rxjs/add/operator/switchMap';
import 'rxjs/add/operator/toPromise';
@Component({
moduleId: module.id,
selector: 'ym-signup',
templateUrl: 'signup.component.html',
styleUrls: ['signup.component.css'],
providers: [SignupService]
})
export class SignupComponent {
@Input()
user = {};
constructor(private router:Router, private signupService:SignupService) {
}
signup(selectedUser:User) {
this.signupService.verification(selectedUser)
.subscribe(data => {
swal({
title: 'Verify token sent on your Email.',
input: 'password',
inputAttributes: {
'maxlength': 10,
'autocapitalize': 'off',
'autocorrect': 'off'
}
}).then(function (password) {
this.signupService.signup(password)
.subscribe(data => {
localStorage.setItem('user', JSON.stringify(data));
this.router.navigate(['dashboard']);
},
error => alert(error));
})
},
error => alert(error));
}
goBack() {
this.router.navigate(['login']);
}
}
Signup.service.ts
import {User} from '../shared/model/user';
import { Headers, Http } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import {Injectable} from '@angular/core';
import {Response} from "angular2/http";
import { Observable } from 'rxjs/Observable';
@Injectable()
export class SignupService {
private postUrl:string = '/api/users/signup';
private verify:string = '/api/users/verify';
constructor(private http:Http) {
}
verification(user:User):Observable<JSON> {
let headers = new Headers({
'Content-Type': 'application/json'
});
return this.http
.post(this.verify, JSON.stringify(user), {headers: headers})
.map(this.extractData)
.catch(this.handleError);
}
signup(token:string):Observable<any> {
let headers = new Headers({
'Content-Type': 'application/json'
});
return this.http
.post(this.postUrl, JSON.stringify({verificationToken:token}), {headers: headers})
.map(this.extractData)
.catch(this.handleError);
}
private extractData(res: Response) {
let body = res.json();
return body || { };
}
private handleError(error: any) {
let errMsg = (error.message) ? error.message :
error.status ? `${error.status} - ${error.statusText}` : 'Server error';
console.error(errMsg);
return Observable.throw(errMsg);
}
}
答案 0 :(得分:3)
根据错误Cannot read property 'signup' of undefined
判断,您似乎在不存在的对象上调用signup()
。
这是正确的,你创建的闭包为.then(function (password) { ... })
,它不捕获周围的上下文this
,因此用this = window
调用,这显然不是你想要的。
请参阅:https://basarat.gitbooks.io/typescript/content/docs/arrow-functions.html
所以你可以用箭头功能轻松修复它:
.then(password => {
this.signupService.signup(password)
.subscribe(data => {
localStorage.setItem('user', JSON.stringify(data));
this.router.navigate(['dashboard']);
}, error => alert(error));
})
答案 1 :(得分:2)
在注册方法中,您将函数作为然后的回调。 你应该像箭头一样来保持相同的上下文。
signup(selectedUser:User) {
this.signupService.verification(selectedUser)
.subscribe(data => {
swal({
title: 'Verify token sent on your Email.',
input: 'password',
inputAttributes: {
'maxlength': 10,
'autocapitalize': 'off',
'autocorrect': 'off'
}
}).then(password => {
this.signupService.signup(password)
.subscribe(data => {
localStorage.setItem('user', JSON.stringify(data));
this.router.navigate(['dashboard']);
},
error => alert(error));
})
},
error => alert(error));
}
答案 2 :(得分:-1)
使用Observable.forkJoin()运行多个并发的http.get()请求。如果任何单个请求失败,整个操作将导致错误状态。 请在下面找到代码段:
getBooksAndMovies() {
Observable.forkJoin(
this.http.get('/app/books.json').map((res: Response) => res.json()),
this.http.get('/app/movies.json').map((res: Response) => res.json())
).subscribe(
data => {
this.books = data[0]
this.movies = data[1]
},
err => console.error(err)
);
getBooksAndMovies() {
Observable.forkJoin(
this.http.get('/app/books.json').map((res: Response) => res.json()),
this.http.get('/app/movies.json').map((res: Response) => res.json())
).subscribe(
data => {
this.books = data[0]
this.movies = data[1]
},
err => console.error(err)
);