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如何讓angular知道自定義窗口事件已被觸發並需要更新檢查

[英]How do I let angular know a custom window event has been fired and requires update checking

我正在使用一個第三方庫 ,該要求我實現自己的事件偵聽器。 這是通過實現window.onGoogleYoloLoad = function() { ... } 我試圖在用戶服務文件中像這樣實現它:

@Injectable()
export class UserService {
    public userCredentials = new EventEmitter<Credentials>();
    constructor(){
        window.onGoogleYoloLoad = function(credentials){
            this.userCredentials.emit(credentials);
        }
    }
}

然后,我訂閱了該活動。 訂閱者確實會收到通知,但視圖不會得到更新。 就像角度不知道事件發生一樣。

回調在Angular區域之外運行。 將回調移動到組件,然后調用ChangeDetectorRef.detectChanges

import { Component, ChangeDetectorRef } from '@angular/core';

@Component(...)
export class MyComponent {
    public userCredentials = new EventEmitter<Credentials>();
    constructor(
        private cd: ChangeDetectorRef,
        private userService: UserService
    ){
        window.onGoogleYoloLoad = function(credentials){
            this.userService.userCredentials.emit(credentials);
            this.cd.detectChanges();
        }
    }
}

重新輸入Angular區域是另一個選擇: markForCheck()和detectChanges()有什么區別?

import { Injectable, NgZone } from '@angular/core';

@Injectable()
export class UserService {
    public userCredentials = new EventEmitter<Credentials>();
    constructor(private zone: NgZone){
        window.onGoogleYoloLoad = function(credentials){
            this.zone.run(() => {
                this.userCredentials.emit(credentials);
            })
        }
    }
}

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