typescript - Aurelia 应用程序中的不活动注销

Question

tl;dr，对于 Aurelia，我如何从 View 模型外部调用 View 模型内部的函数？

我需要对一段时间未执行操作(路由更改、向服务器请求等)的用户执行客户端注销。看完这篇GitHub issue我创建了一个不活动注销 View 和 View 模型，并将其合并到我的 app.html 和我的 attached() 函数中，我启动计时器并在时间到期时注销用户。

这一切都很好，但我遇到了一个问题，让我觉得所有这些都是一个巨大的兔子洞。如何从 View 模型外部调用我的 resetInactivityTimer() 函数，是否可以使类中的一个函数可公开调用？就像执行对服务器的请求时，我想从我的服务类中调用 resetInactivityTimer() 函数

inactivity-logout.ts

import {Aurelia} from 'aurelia-framework';
import {Router} from 'aurelia-router';
import {inject} from 'aurelia-dependency-injection';

@inject(Aurelia, Router)
export class InactivityLogout {
    inactivityWarningDuration: number; // how long should the warning be up
    initialInactivityWarningDuration: number; // how long should the warning be up
    inactivityDuration: number; // how long before we warn them
    inactivityIntervalHandle: any;

    constructor(aurelia, router) {
        this.aurelia = aurelia;
        this.router = router;
        this.initialInactivityWarningDuration = 5;
        this.inactivityWarningDuration = this.initialInactivityWarningDuration;
        this.inactivityDuration = 5;
    }

    attached() {
        this.queueInactivityTimer();
    }

    resetInactivityTimer(){
        $("#LogoutWarningPopup").modal("hide"); 

        this.inactivityWarningDuration = this.initialInactivityWarningDuration;
        clearInterval(this.warningInterval);
        this.queueInactivityTimer();
    }

    queueInactivityTimer(){
        clearTimeout(this.inactivityIntervalHandle);

        this.inactivityIntervalHandle = setTimeout(() => {
            this.displayWarning();
        }, 1000 * this.inactivityDuration);
    }

    displayWarning(){
        $("#LogoutWarningPopup").modal({ backdrop: 'static', keyboard: false });
        this.warningInterval = setInterval(()=>{
                this.inactivityWarningDuration--;
                if(this.inactivityWarningDuration <= 0){
                    clearInterval(this.warningInterval);
                    this.logout();
                }
            }, 1000); //start counting down the timer
    }

    logout(){
        $("#LogoutWarningPopup").modal("hide");
        console.log("due to inactivity, you've been logged out.")
        this.aurelia.setRoot('views/login');
    }
}

app.html

    <require from='./inactivity-logout.js'></require>
    <inactivity-logout></inactivity-logout>

search-service.ts

    performSearch(searchText: String) {

        /*
         * Stuff here to reset inactivity timer 
         */

        return this.httpClient.put("/api/Search", searchText)
           .then(response => {
               return response;
           });
    }

Answer 1

全局事件的好方法是将 PubSub 模式与 aurelia-event-aggregator 库一起使用。

import {Aurelia} from 'aurelia-framework';
import {Router} from 'aurelia-router';
import {inject} from 'aurelia-dependency-injection';
import {EventAggregator} from 'aurelia-event-aggregator';

@inject(Aurelia, Router, EventAggregator)
export class InactivityLogout {
    inactivityWarningDuration: number; // how long should the warning be up
    initialInactivityWarningDuration: number; // how long should the warning be up
    inactivityDuration: number; // how long before we warn them
    inactivityIntervalHandle: any;

    constructor(aurelia, router, ea) {
        this.aurelia = aurelia;
        this.router = router;
        this.initialInactivityWarningDuration = 5;
        this.inactivityWarningDuration = this.initialInactivityWarningDuration;
        this.inactivityDuration = 5;
        this.ea = ea;
        
        // subscribe
        this.sub = this.ea.subscribe(RefreshInactivity, msg => {
           console.log(msg.value);
        });

        // to unsubscribe somewhere
        // this.sub.dispose()
    }
...

}

export class RefreshInactivity {
  
  constructor(value) {
    this.value = value;
  }
  
}

在应用中某处发送事件

 this.ea.publish(new RefreshInactivity('some value'));