我正在尝试使用stomp.js实现Stomp Websocket客户端。
我正在使用angular2与typescript和webpack,并且我对所有这些技术都是新手。 我的angular2项目建立在这个种子上: https://github.com/angular/angular2-seed
作为实现stomp.js客户端的指南,我使用了https://github.com/sjmf/ng2-stompjs-demo
我目前得到的错误如下:
?d41d:73 EXCEPTION: TypeError: Cannot read property 'client' of undefined in [null]
此方法发生错误:
public configure() : void {
// Check for errors
if (this.state.getValue() != STOMPState.CLOSED) {
throw Error("Already running!");
}
let scheme : string = 'ws';
if( AppSettings.IS_SSL ) {
scheme = 'wss';
}
this.client = Stomp.client(
scheme + '://'
+ AppSettings.HOST + ':'
+ AppSettings.WEBSOCK_PORT
+ AppSettings.WEBSOCK_ENDPOINT
);
this.client.heartbeat.incoming = AppSettings.HEARTBEAT;
}
所以Stomp
似乎未定义。
我正在导入:
import {Stomp} from "stompjs";
我已经像这样使用npm安装了stomp.js
npm install --save stompjs
我的stompjs模块看起来像这样:
declare module "stompjs" {
export interface Client {
heartbeat: any;
debug(...args: string[]);
connect(...args: any[]);
disconnect(disconnectCallback: () => any, headers?: any);
send(destination: string, headers?:any, body?: string);
subscribe(destination: string, callback?: (message: Message) => any, body?: string);
unsubscribe();
begin(transaction: string);
commit(transaction: string);
abort(transaction: string);
ack(messageID: string, subscription: string, headers?: any);
nack(messageID: string, subscription: string, headers?: any);
}
export interface Message {
command: string;
headers: any;
body: string;
ack(headers?: any);
nack(headers?: any);
}
export interface Frame {
constructor(command: string, headers?: any, body?: string);
toString(): string;
sizeOfUTF8(s: string);
unmarshall(datas: any);
marshall(command: string, headers?, body?);
}
export interface Stomp {
client: Client;
Frame: Frame;
over(ws: WebSocket);
}
}
我想我错过了我的模块和实际库之间的联系,但我真的不知道如何做到这一点,我也无法从github演示中找到它。
提前感谢您的帮助!
答案 0 :(得分:1)
您是否尝试在界面旁边导出变量?
export var Stomp: Stomp;
答案 1 :(得分:0)
直接在Angular2(或Angular4)中使用Stomp.js绝对不是一件容易的事。
对于使用Observables的正确Angular2(和Angular4)类型StompService,请参阅https://github.com/stomp-js/ng2-stompjs。
还有Angular2和Agular4的示例应用程序。