Question

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，它运行得很好，为了在Ionic中实现它我做了以下，我首先创建了一个名为Authservice的提供程序：

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);
    });
   });

      }

     }

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Uncaught（承诺）：[object Object]错误，可能是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

Answer 1

postData(credentials, type) {
  let headers = new HttpHeaders();    
  return this.http.post(apiUrl + type, JSON.stringify(credentials), { headers:    headers });
}

这将在注册页面上返回observable，只需订阅它。

Answer 2

您可以使用Typescript的async方法让您的生活更轻松

您在异步

中的postData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);
    }
}

不要忘记在AuthServiceProvider

中导入toPromise运算符

import 'rxjs/add/operator/toPromise';

Answer 3

尝试在app.module.ts中导入HttpModule;

{import HttpModule } from '@angular/http'

然后将HttpModule添加到导入中；

imports : [BrowserModule, HttpModule, IonicModule.forRoot(MyApp) ]

Ionic 3 Uncaught（承诺）：[object Object]

3 个答案: