小编mid*_*ght的帖子

当我打开网页数据显示,但我更改组件并返回此组件数据不显示.它显示没有项目.我检查日志但没有运行到ngOnIt.ngOnIt在web strat或web reload上运行.

这是stock.service.ts

import { Injectable } from '@angular/core';

import { AngularFirestore, AngularFirestoreCollection, AngularFirestoreDocument } from 'angularfire2/firestore';

import { Observable } from 'rxjs/Observable';
import { Stock } from './stock.model';

@Injectable()
export class StockService {

  stocksCollection: AngularFirestoreCollection<Stock>;
  stocks: Observable<Stock[]>;

  constructor(public afs: AngularFirestore) {
    this.stocks = this.afs.collection('stocks').valueChanges();
  }
  getStock(){
    return this.stocks;
  }
}

stock.component.ts

import { Component, OnInit, Input } from '@angular/core';
import { ActivatedRoute,Params } from '@angular/router';

import { StockService } from '../shared/stock.service';
import { Stock } from '../shared/stock.model';
import …