我正在使用Angular4和Firebase构建1-1聊天,而且我对Angular很新颖。 为了发起对话,我试图显示'/ users'子集合中的所有可用用户。所以,我需要获取用户/ {user.uid} /用户名。使用Angular4和Fireabse获取uid并迭代对象数组
这是我chat.component.ts:
import { Component, OnInit } from '@angular/core';
import {AngularFireDatabase, FirebaseListObservable} from 'angularfire2/database';
import { AngularFireAuth } from 'angularfire2/auth';
import { UserSessionService } from '../_services/user-session.service';
@Component({
selector: 'app-chat',
templateUrl: './chat.component.html',
styleUrls: ['./chat.component.css']
})
export class ChatComponent implements OnInit {
items: FirebaseListObservable<any[]>;
other_users: FirebaseListObservable<any[]>;
user_id: any;
from: any;
msgVal: string = '';
constructor(public afAuth: AngularFireAuth, public af: AngularFireDatabase, public logged_user: UserSessionService){ }
ngOnInit() {
this.from= this.logged_user.getFirebaseUid();
this.user_id= this.logged_user.getFirebaseUid();
this.items = this.af.list('/personalMessages', {
query: { limitToLast: 5 }
});
this.other_users= this.af.list('/users');
}
findChat(){
this.other_users= this.other_users;
this.user_id = this.user_id;
}
chatSend(theirMessage: string) {
this.items.push({ text: theirMessage, from: this.logged_user.getFirebaseUid(), isRead: false, timestamp: + new Date() });
this.msgVal = '';
this.user_id = this.user_id;
this.other_users= this.other_users;
}
}
这是我chat.component.html:
<div class="users-chat-container" *ngFor="let other_user of other_users| async">
<div id="circle" style="background-color:pink;">
</div>
<br/> <a href="#">{{other_user.username}} </a>
</div>
<div class="chat-container" *ngFor="let item of items | async">
<div id="circle" style="background-image:url(http://www.ics.forth.gr/mobile/female.png);">
</div>
<br/> <a href="#">{{item.from}} </a>
<p>{{item.text}}</p>
</div>
<input type="text" id="message" placeholder="Type a message..." (keyup.enter)="chatSend($event.target.value)" [(ngModel)]="msgVal" />
我如何可以遍历对象的数组,我从克服“ /用户的收藏?谢谢! :)
谢谢!是的,它的工作。我可以在我的控制台中看到结果。但是在这里,锄头可以在我的chat.component.hmtl中显示结果吗?使用* ngFor =“let other_userrs | async”我在我的控制台中发现错误:错误:InvalidPipeArgument:'[object Object]'管道'AsyncPipe'。你是否也遇到过这个问题,或者你可以帮忙吗?谢谢! –
发布您的控制台日志result.check此链接也https://stackoverflow.com/questions/38121908/angular2-n-getting-invalid-argument-object-object-for-pipe-asyncpipe – CharanRoot