使用dist文件夾時，Angular 5無法從NodeJs，Mongodb獲取數據

Question

我正在使用帶有節點js的angular 5來創建和獲取事件數據。 我的express.js文件如下所示

const express = require('express');
const app = express();
const router = express.Router();

const mongoose = require('mongoose');
const config = require('./database');
const path = require('path');
const appRoot = require('app-root-path');

const event = require('./routes/event.router');

const bodyParser = require('body-parser');
const cors = require('cors');
const port = process.env.PORT || 8080; // Allows heroku to set port

mongoose.Promise = global.Promise;
//assigning value 
process.env.NODE_ENV = 'devlopment';

mongoose.connect(config.uri, {
  useMongoClient: true,
}, (err) => {
  // Check if database was able to connect
  if (err) {
    console.log('Could NOT connect to database: ', err); // Return error message
  } else {
    console.log('Connected to ' + config.db); // Return success message
  }
});

app.use(cors());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.use(express.static(path.join(appRoot.path, 'dist')));
app.get('*', (req, res) => {
 res.sendFile(path.join(appRoot.path, 'dist/index.html'));
});

app.use('/event', event); //Event Router
app.listen(port, () => {
  console.log('Listening on port ' + port + ' in ' + process.env.NODE_ENV + ' mode');
});

event.router.js看起來像這樣

var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');

const Event = require('../../model/event.model');

/* GET ALL EVENTS FROM DB */
router.get('/', function(req, res, next) {
  console.log(Event);
  Event.find(function (err, events) {
    if (err) return next(err);
    res.json(events);
  });
});

/* GET SINGLE EVENT BY ID */
router.get('/:id', function(req, res, next) {
  Event.findById(req.params.id, function (err, post) {
    if (err) return next(err);
    res.json(post);
  });
});

module.exports = router;

我的event.component.html看起來像這樣

<div class="container">
  <h1>Event List</h1>
  <table class="table">
    <thead>
      <tr>
        <th>Event Id</th>
        <th>Event Name</th>
        <th>Event Desc</th>
        <th>Event Date</th>
      </tr>
    </thead>
    <tbody>
      <tr *ngFor="let event of events">
        <td><a routerLink="/event-details/{{ event._id }}">{{ event._id }}</a></td>
        <td>{{ event.eventname }}</td>
        <td>{{ event.eventdesc }}</td>
        <td>{{ event.eventdates }}</td>
      </tr>
    </tbody>
  </table>
</div>

event.component.ts看起來像這樣

import { Component, OnInit } from '@angular/core';
import { EventService } from '../event.service';

@Component({
  selector: 'app-event',
  templateUrl: './event.component.html',
  styleUrls: ['./event.component.css']
})
export class EventComponent implements OnInit {

  events: Event[] = [];

  constructor(
    protected eventService: EventService
    ) { }

  ngOnInit() {
    this.getAll();
  }

  getAll() {
    this.eventService.getEvents().subscribe(res => {
      this.events = res as Event[];
      console.log(res);
    }, err => {
      console.log(err);
    });
  }
}

event.service.ts看起來像這樣

import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs';
import { HttpClientModule } from '@angular/common/http';

import { HttpClient } from "@angular/common/http";
import 'rxjs/add/operator/map';


@Injectable()
export class EventService {


  headers = new Headers({ 'Content-Type': 'application/json' });

  constructor(
   private http: Http,
    ) { }




  getEvent(id: string) {
    return this.http.get('event' + id, { headers: this.headers }).map(res => res.json());
  }

  getEvents(){
    return this.http.get('http://localhost:8080/event', {headers: this.headers}).map(res => res.json() );
  }

}

問題是，當我嘗試從mongodb中獲取所有數據時，它在瀏覽器的控制台選項卡中顯示了類似GET http://localhost:8080/event 404 (Not Found) 。 但是當我刪除行時

app.get('*', (req, res) => { res.sendFile(path.join(appRoot.path, 'dist/index.html')); });

從express.js顯示數據。 但是我認為該行應該在express.js文件中，因為當angular創建數據時，它應該從該文件夾中獲取所有html和組件。 有人可以告訴我我做錯了什么嗎？

任何幫助和建議都是非常可取的。

Answer 1

把你的

app.get('*', (req, res) => {
 res.sendFile(path.join(appRoot.path, 'dist/index.html'));
});

后

app.use('/event', event); //Event Router

這背后的原因是，Express在每個獲取請求上都返回索引文件，而不檢查其他路由，因為您在事件之前具有*路由，隨着位置的更改，Express將首先查找事件路由，因此事件url將使用事件控制器對於其他URL，它將返回index.html

另外，請保持在“ api /”路由之后保留每個API的做法，例如，獲取事件api路由應為/ api / events

這將用角路由分隔您的api代碼。

想象一下，您的角度應用程序中有一個/ events路由。 因此，如果您在網址欄中輸入http：// localhost / events route，則會得到事件列表mongoDB api的響應，而不是所需的頁面。

編輯鏈接以獲得更多的了解。

https://malcoded.com/posts/angular-backend-express

https://www.reddit.com/r/angularjs/comments/2f4858/angular_express_best_way_to_handle_routing/