我正在开发基于Angular-firebase的聊天应用程序,
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我将数据发送到我的Angular服务文件chat.service.ts时收到错误
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我正在把错误提到下面
ChatFormComponent.html:5 ERROR TypeError:queryFn不是ChatService.push ../ src /中的AngularFireDatabase.push ../ node_modules / angularfire2 / database / database.js.AngularFireDatabase.list(database.js:18)中的函数ChatService.push上的app / services / chat.service.ts.ChatService.getMessages(chat.service.ts:39)../ src / app / services / chat.service.ts.ChatService.sendMessage(chat.service.ts :29)
- 我正在将组件的代码发送到下面的服务文件中
.ts文件
import { Component, OnInit } from '@angular/core';
import { ChatService } from '../services/chat.service';
@Component({
selector: 'app-chat-form',
templateUrl: './chat-form.component.html',
styleUrls: ['./chat-form.component.css']
})
export class ChatFormComponent implements OnInit {
message: string;
constructor( private _chat: ChatService) {}
send() {
console.log(this.message);
this._chat.sendMessage(this.message);
this.message = '';
}
}
.html文件
<input class="chatInput" [(ngModel)]="message"/>
<button class="chatButton" (click)=send()>Send</button>
- 上面的组件代码将数据发送到与Firebase交互的服务
服务代码 - >
import { Injectable } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable } from 'angularfire2/database';
import { AngularFireAuth } from 'angularfire2/auth';
import { Observable } from 'rxjs/Observable';
import { AuthService } from '../services/auth.service';
import * as firebase from 'firebase/app';
import { ChatMessage } from '../models/chat-message.model';
@Injectable()
export class ChatService {
user: firebase.User;
chatMessages: FirebaseListObservable<ChatMessage[]>;
chatMessage: ChatMessage;
userName: Observable<string>;
constructor( private db: AngularFireDatabase , private afAuth: AngularFireAuth ) { }
getUser() {}
sendMessage(msg: string) {
const timestamp = this.getTimeStamp();
const email = 'biky700@gmail.com';
this.chatMessages = this.getMessages();
this.chatMessages.push({
message: msg,
timeSent: timestamp,
userName: 'Anurag Ranjan',
email: email });
}
getMessages(): FirebaseListObservable<ChatMessage[]> {
// query to create our message feed binding
return this.db.list('messages', {
query: {
limitToLast: 25,
orderByKey: true
}
});
}
getTimeStamp(){}
}
}
重要
- 在上面的服务代码中,您可以看到创建我们的消息源绑定的代码的一部分,下面给出了代码
getMessages():FirebaseListObservable <ChatMessage []> {
return this.db.list('messages',{
查询:{
limitToLast:25,
orderByKey:是的
}
});
}
当我在这上面徘徊时,我会得到一个下面给出的消息
**
[ts]类型'{query:{limitToLast:number; orderByKey:boolean; }; ''不能赋值给'QueryFn'类型的参数 . 对象文字只能指定已知属性,'QueryFn'类型中不存在'query' . (property)orderByKey:boolean
**
2 回答
有人似乎和你的问题一样,这篇文章已经回复了:Stackoverflow .
请试试这个:
}
你的getMessage函数应该是这样的 .
有关详细信息,请参阅此内容 . https://github.com/angular/angularfire2/blob/master/docs/rtdb/querying-lists.md