Question

我在Angular 7 StackBlitz Example中创建了模态服务：

模式

export class Modal {

  protected modal: any = null;

  close() {
    this.modal.close();
  }

}

ModalService

import { ApplicationRef, ComponentFactoryResolver, EmbeddedViewRef, Injectable, Injector } from '@angular/core';

@Injectable({
  providedIn: 'root'
})

export class ModalService {

  private componentRef: any;
  private modalContainer: any;

  constructor(
    private componentFactoryResolver: ComponentFactoryResolver,
    private appRef: ApplicationRef,
    private injector: Injector) { }

  private createFormModal(component: any): Element {

    this.componentRef = this.componentFactoryResolver.resolveComponentFactory(component.component).create(this.injector);

    this.componentRef.instance.modal = this;

    this.appRef.attachView(this.componentRef.hostView);

    return (this.componentRef.hostView as EmbeddedViewRef<any>).rootNodes[0] as HTMLElement;
  }

  open(component: any): void {

    const alertElement = this.createFormModal(component);

    const content = document.createElement('div');
    content.classList.add('modal');
    content.appendChild(alertElement);

    this.modalContainer = document.createElement('div');
    this.modalContainer.classList.add('modal');
    this.modalContainer.appendChild(content);

    document.body.appendChild(this.modalContainer);

  }

  close(): void {
    this.appRef.detachView(this.componentRef.hostView);
    this.modalContainer.parentNode.removeChild(this.modalContainer);
    this.componentRef.destroy();
  }

}

点击按钮...我可以打开模态...

问题是我可以打开多个。

如何确保单击按钮时仅打开一个模式？

Answer 1

由于服务是单例（在整个应用程序生命中都是一个实例），因此您可以像这样在服务中保留模态的状态：

import { ApplicationRef, ComponentFactoryResolver, EmbeddedViewRef, Injectable, Injector } from '@angular/core';

@Injectable({
  providedIn: 'root'
})

export class ModalService {

  private componentRef: any;
  private modalContainer: any;
  private alertElement: any;

  constructor(
    private componentFactoryResolver: ComponentFactoryResolver,
    private appRef: ApplicationRef,
    private injector: Injector) { }

  private createFormModal(component: any): Element {

    this.componentRef = this.componentFactoryResolver.resolveComponentFactory(component.component).create(this.injector);

    this.componentRef.instance.modal = this;

    this.appRef.attachView(this.componentRef.hostView);

    return (this.componentRef.hostView as EmbeddedViewRef<any>).rootNodes[0] as HTMLElement;
  }

  open(component: any): void {
    if(this.alertElement) return;

    this.alertElement = this.createFormModal(component);

    const content = document.createElement('div');
    content.classList.add('modal');
    content.appendChild(this.alertElement);

    this.modalContainer = document.createElement('div');
    this.modalContainer.classList.add('modal');
    this.modalContainer.appendChild(content);

    document.body.appendChild(this.modalContainer);
  }

  close(): void {
    this.appRef.detachView(this.componentRef.hostView);
    this.modalContainer.parentNode.removeChild(this.modalContainer);
    this.componentRef.destroy();
    this.alertElement = null;
  }

}

Answer 2

由于此服务是单例服务，因此您可以仅在打开模式时设置标志，而在关闭模式时将其关闭。然后在打开的函数中，您可以检查标志是否为true，如果不正确，则不要打开第二个模式。

单击按钮时仅打开一个模式

2 个答案: