Ionic 3 Uncaught(承诺):[object Object] [英] Ionic 3 Uncaught (in promise): [object Object]
问题描述
我是 Ionic 3 和移动开发的新手.我正在尝试将 MySQL 数据库连接到我的 Ionic 应用程序和 PHP Restful API.我用 Postman 测试了 API，它工作得很好，为了在 Ionic 中实现它，我做了以下工作，我首先创建了一个名为 Authservice 的提供者:
I am new to Ionic 3 and mobile development. I am trying to connect a MySQL DB to my Ionic app and a PHP Restful API. I tested the API with Postman and it is working just fine, in order to implement it in Ionic I did the following, I first made a provider named Authservice:
import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import 'rxjs/add/operator/map';
let apiUrl = "http://localhost/api/"
/*
Generated class for the AuthServiceProvider provider.
See https://angular.io/guide/dependency-injection for more info on
and Angular DI.
*/
@Injectable()
export class AuthServiceProvider {
constructor(public http: HttpClient) {
console.log('Hello AuthServiceProvider Provider');
}
postData(credentials, type) {
return new Promise((resolve, reject) => {
let headers = new HttpHeaders();
this.http.post(apiUrl + type, JSON.stringify(credentials), { headers: headers })
.subscribe(res => {
resolve(res.json());
}, (err) => {
reject(err);
});
});
}
}
还有一个注册页面:
import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import { AuthServiceProvider } from '../../providers/auth-service/auth- service';
/**
* Generated class for the SignupPage page.
*
* See https://ionicframework.com/docs/components/#navigation for more info on
* Ionic pages and navigation.
*/
@IonicPage()
@Component({
selector: 'page-signup',
templateUrl: 'signup.html',
})
export class SignupPage {
responseData: any;
userData = {"username": "","password": "", "name": "","email": ""};
constructor(public navCtrl: NavController, public authServiceProvider: AuthServiceProvider) {
}
signUp() {
this.authServiceProvider.postData(this.userData, "signup").then((result) =>{
this.responseData = result;
console.log(this.responseData);
localStorage.setItem('userData', JSON.stringify(this.responseData));
});
}
goToLogin() {
this.navCtrl.pop();
}
}
运行时我得到一个未捕获的(承诺):[object Object] 错误可能是 在这里看到.
When running this I am getting an Uncaught (in promise): [object Object] error as can be seen here.
更新
我现在收到以下错误:
Object { headers: {…}, status: 404, statusText: "Not Found", url: "http://localhost/PHP-SLIM-RESTFUL/API/signup", ok: false, name: "HttpErrorResponse", message: "Http failure response for http://localhost/PHP-SLIM-RESTFUL/API/signup: 404 Not Found", error: "<html><head><title>404 Page Not Found</title><style>body{margin:0;padding:30px;font:12px/1.5 Helvetica,Arial,Verdana,sans-serif;}h1{margin:0;font-size:48px;font-weight:normal;line-height:48px;}strong{display:inline-block;width:65px;}</style></head><body><h1>404 Page Not Found</h1><p>The page you are looking for could not be found. Check the address bar to ensure your URL is spelled correctly. If all else fails, you can visit our home page at the link below.</p><a href=\"/PHP-Slim-Restful/api/\">Visit the Home Page</a></body></html>" } signup.ts:36:6
推荐答案
你可以使用 Typescript 的 async 方法让您的生活更轻松
You can make use of Typescript's async methods to make your life easier
你的 postData 异步方法
AuthServiceProvider:
public async postData(credentials, type): Promise<any> {
let headers = new HttpHeaders();
await this.http.post(apiUrl + type, JSON.stringify(credentials), { headers: headers }).toPromise();
}
注册页面:
public async signUp(): void {
try {
// request successful
this.responseData = await this.authServiceProvider.postData(this.userData, "signup");
console.log(this.responseData);
localStorage.setItem('userData', JSON.stringify(this.responseData));
}
catch(e) {
// some error occured, handle it here..
console.log(e);
}
}
不要忘记导入 toPromise AuthServiceProvider
import 'rxjs/add/operator/toPromise';
这篇关于Ionic 3 Uncaught(承诺):[object Object]的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
