使用微调器作为全局服务

Question

我正在使用 ng2-admin 主题中的以下微调器：

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

@Injectable()
export class BaThemeSpinner {

  private _selector:string = 'preloader';
  private _element:HTMLElement;

  constructor() {
    this._element = document.getElementById(this._selector);
  }

  public show():void {
    this._element.style['display'] = 'block';
  }

  public hide(delay:number = 0):void {
    setTimeout(() => {
      this._element.style['display'] = 'none';
    }, delay);
  }
}

所以对于每个组件我都必须导入它，我想避免它，因为很多组件都会使用它。我怎样才能让它对整个应用程序可用？

Answer 1

您可以创建一个基础组件并放置一个 getter 就像

export class BaseView {

    protected _injector:Injector;

    protected _spinnerService:SpinnerService;

    constructor() {
        let providers = ReflectiveInjector.resolve([SpinnerService]);
        this._injector = ReflectiveInjector.fromResolvedProviders(providers);
    }

    get spinnerService(): SpinnerService { 
        if (this._spinnerService == null) {
            this._spinnerService = this._injector.get(SpinnerService);
        }
        return this._spinnerService;
    }
}

然后使用它：

this.spinnerService.show()

ReflectiveInjector 可以在 @angular/core

中找到

文档：https://angular.io/docs/ts/latest/api/core/index/ReflectiveInjector-class.html

使用微调器作为全局服务

Using spinner as global service

angular

typescript

spinner

service-locator