Express 在angular2中接收套接字消息时如何更新DOM?
我正在尝试用angular2+socket.io实现聊天应用程序,我能够从服务器上得到消息,但一旦得到消息,我就知道如何更新DOM。我像Express 在angular2中接收套接字消息时如何更新DOM?,express,socket.io,angular,Express,Socket.io,Angular,我正在尝试用angular2+socket.io实现聊天应用程序,我能够从服务器上得到消息,但一旦得到消息,我就知道如何更新DOM。我像this.messages.push(message)那样做过,但没有效果 这就是我正在做的 Home.ts import {Component} from 'angular2/core'; import * as io from 'socket.io-client'; import * as _ from 'lodash'; const socket = i
this.messages.push(message)
那样做过,但没有效果
这就是我正在做的
Home.ts
import {Component} from 'angular2/core';
import * as io from 'socket.io-client';
import * as _ from 'lodash';
const socket = io.connect();
const template: string = require("./home.html");
const style: string = require("./home.scss");
@Component({
selector: 'home',
template: template,
styles: [style]
})
export class Home {
private _user: any;
private messages: any;
private draftMessage: any;
constructor() {
this.messages = {};
socket.on("on:send-message", (data) => {
this.messages.push(data);
console.log("message :", data);
});
socket.on("on:joined-room", (data) => {
console.log("joined");
});
}
get user() : any {
return this._user;
}
onEnter(event: any): void {
event.preventDefault();
socket.emit("on:send-message", this.draftMessage);
}
}
这是我的特快路线
socket.on("on:send-message", (data) => {
socket.emit("on:send-message", data);
});
Home.html
<div class="panel-body msg-container-base">
<ol class="chat">
<li class="self" *ngFor="let row of messages">
<div class="avatar"><img src="/avatar.png"/></div>
<div class="msg">
<p>{{row}}</p>
<time>20:18</time>
</div>
</li>
</ol>
</div>
{{row}}
20:18
如何在angular2中实现ChangeDetectorRef或检测策略
谢谢。我认为问题在于您在Angular2(组件或服务)之外初始化套接字,因此从套接字接收事件的代码在Angular2区域之外执行。因此,框架无法检测到更改 您可以使用
NgZone
在区域中显式运行此代码:
@Component({
selector: 'home',
template: template,
styles: [style]
})
export class Home {
private _user: any;
private messages: any;
private draftMessage: any;
constructor(private ngZone:NgZone) {
this.messages = {};
socket.on("on:send-message", (data) => {
this.ngZone.run(() => {
this.messages.push(data);
console.log("message :", data);
});
});
(...)
}
}
要么在Angular2的上下文中初始化套接字。我认为问题在于在Angular2(组件或服务)之外初始化套接字,因此从套接字接收事件的代码在Angular2区域之外执行。因此,框架无法检测到更改 您可以使用
NgZone
在区域中显式运行此代码:
@Component({
selector: 'home',
template: template,
styles: [style]
})
export class Home {
private _user: any;
private messages: any;
private draftMessage: any;
constructor(private ngZone:NgZone) {
this.messages = {};
socket.on("on:send-message", (data) => {
this.ngZone.run(() => {
this.messages.push(data);
console.log("message :", data);
});
});
(...)
}
}
要么在Angular2的上下文中初始化套接字。如何在组件模板中显示数据?我提到了如何呈现@Thierry消息列表如何在组件模板中显示数据?我提到了如何呈现@Thierry消息列表