Angular6 按服务打开/显示组件 [英] Angular6 open/show component by service

问题描述

我构建了一个 Angular 组件，用作我的应用程序的对话框(例如，显示应用程序错误)和一个对话框-服务，用于从其他组件打开/显示该对话框.

dialog.component.html

<div>部分内容

</kendo-dialog>

dialog.component.ts

import { Component, OnInit } from '@angular/core';从'./dialog'导入{对话框}；//模型@成分({选择器:'对话框'，templateUrl: './dialog.component.html',styleUrls: ['./dialog.component.scss']})导出类 DialogComponent 实现 OnInit {公开开放=假；公共对话:对话；//包含标题、消息等属性构造函数(){}ngOnInit() {}公共 showDialog(对话:对话){this.dialog = 对话；this.opened = true;}}

dialog.service.ts

import { Injectable } from '@angular/core';从'./dialog'导入{对话框}；@Injectable()导出类 DialogService {构造函数(){}公共显示对话框(标题:字符串，消息:字符串，isConfirm:布尔值，图标?:字符串){const dialog = new Dialog(title, message, isConfirm, icon);//TODO: 使用 DialogService 打开/显示对话框组件//从 DialogComponent = true 设置打开的属性}}

我需要在 DialogService 中做什么才能从任何地方显示我的 DialogComponent?例如，我在某处有一个 try/catch 块，并想用 DialogComponent 显示错误消息:

尝试{//做点什么} 抓住(错误=> {this.dialogService.showDialog('Title', error.Message, true);})

解决方案

你应该使用 Angular CDK 叠加.

它允许您创建具有一定不透明度的背景，在其上动态注入组件，并配置位置策略和滚动策略.

让我为您提供一些可以帮助您入门的代码:

构造函数(私人叠加:叠加，私有 componentFactoryResolver: ComponentFactoryResolver) {}让 componentFactory = this.componentFactoryResolver.resolveComponentFactory(DialogComponent);const overlayRef = this.overlay.create({hasBackdrop:真实，positionStrategy: this.overlay.position().global().centerHorizo​​ntally().centerVertically()});overlayRef.backdropClick().subscribe(res => {overlayRef.detach();});让门户 = 新的 ComponentPortal(componentFactory.componentType);let component = overlayRef.attach(portal);component.instance.onCloseClick.subscribe(() => {overlayRef.detach();});

I built an angular component to use as a dialog for my app (e.g to show application errors) and a dialog-service to open/show that dialog from other components.

dialog.component.html

<kendo-dialog *ngIf="opened">
  <div>
    Some Content
  </div>
</kendo-dialog>

dialog.compontent.ts

import { Component, OnInit } from '@angular/core';
import { Dialog } from './dialog'; // Model

@Component({
  selector: 'dialog',
  templateUrl: './dialog.component.html',
  styleUrls: ['./dialog.component.scss']
})
export class DialogComponent implements OnInit {
  public opened = false;
  public dialog: Dialog; // Contains properties like title, message

  constructor() {
  }

  ngOnInit() {}

  public showDialog(dialog: Dialog) {
    this.dialog = dialog;
    this.opened = true;
  }
}

dialog.service.ts

import { Injectable } from '@angular/core';
import { Dialog } from './dialog';

@Injectable()
export class DialogService {
  constructor() {}

  public showDialog(
    title: string,
    message: string,
    isConfirm: boolean,
    icon?: string
  ) {
    const dialog = new Dialog(title, message, isConfirm, icon);

    // TODO: Open/Show Dialog Component with DialogService
    // set opened property from DialogComponent = true
  }
}

Whats do I need to do in DialogService to be able showing my DialogComponent from anywhere? For example I have a try/catch block somewhere and want to show the error message with DialogComponent:

try {
// Do something
} catch(error => {
    this.dialogService.showDialog('Title', error.Message, true);
})

解决方案

Your should use the Angular CDK Overlay.

It allows you to create a backdrop with a certain opacity, to dynamically inject a component over it, and to configure the position strategy and scroll strategy.

Let me provide you some code that may help you get started:

constructor(
   private overlay: Overlay,
   private componentFactoryResolver: ComponentFactoryResolver
) {}

let componentFactory = this.componentFactoryResolver.resolveComponentFactory(DialogComponent);

const overlayRef = this.overlay.create(
  {
    hasBackdrop: true,
    positionStrategy: this.overlay.position().global().centerHorizontally().centerVertically()
  }
);

overlayRef.backdropClick().subscribe(res => {
  overlayRef.detach();
});

let portal = new ComponentPortal(componentFactory.componentType);

let component = overlayRef.attach<DialogComponent>(portal);

component.instance.onCloseClick.subscribe(() => {
  overlayRef.detach();
});

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