Angular 2 ng-bootstrap模式:如何将数据传递给入口组件

Question

我正在尝试将数据发送到自定义模态内容组件,以便我可以从任何其他组件调用它,而不是重复代码.我是Angular 2的新手,并且已经遵循ng-boostrap的"组件内容"演示以及Angular文档中的"组件交互",并且没有找到一种方法来实现这一点,或者是这个案例的一个例子.

我可以打开模态,但不能使用动态内容.我尝试了@Input变量方法并没有成功.我也加入ModalService了提供商app.module.ts.这就是我对两种方法都不起作用的方法:

page.component.html:

<a (click)="modal('message')">
<template ngbModalContainer><my-modal [data]="data"></my-modal></template>

page.component.ts:

import { Component } from '@angular/core'
import { NgbModal } from '@ng-bootstrap/ng-bootstrap'
import { ModalService } from '../helpers/modal.service'
import { ModalComponent } from '../helpers/modal.component'

@Component({
  selector: 'app-page',
  templateUrl: './page.component.html',
  styleUrls: ['./page.component.scss'],
  entryComponents: [ ModalComponent ]
})

export class PageComponent {
  data = 'customData'
  constructor (
    private ngbModalService: NgbModal,
    private modalService: ModalService
   ) { }

  closeResult: string
  modal(content) {
    this.data = 'changedData'
    this.modalService.newModal(content)
    this.ngbModalService.open(ModalComponent).result.then((result) => {
      this.closeResult = `Closed with: ${result}`
    }, (reason) => {
      this.closeResult = `Dismissed ${reason}`
    });
  }
}

modal.service.ts:

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

@Injectable()
export class ModalService {
  private modalSource = new Subject<string>()
  modal$ = this.modalSource.asObservable()
  newModal(content: string) {
    this.modalSource.next(content)
  }
}

modal.component.ts:

import { Component, Input, OnDestroy } from '@angular/core';
import { Subscription }   from 'rxjs/Subscription';
import { ModalService } from './modal.service'

@Component({
  selector: 'my-modal',
  template: `
    <div class="modal-body">
    {{data}}
    {{content}}
    </div>
  `
})

export class ModalComponent implements OnDestroy {
  @Input() data: string
  content = 'hello'

  subscription: Subscription
  constructor(
    private modalService: ModalService
  ) {
    this.subscription = modalService.modal$.subscribe(
      content => {
        this.content = content
    });
  }

  ngOnDestroy() {
    this.subscription.unsubscribe();
  }
}

使用angular v2.1.0,angular-cli v1.0.0-beta.16,ng-bootstrap v1.0.0-alpha.8

Answer 1

我解决了!这是怎么做的:

• 在组件中(从您打开模态的位置)执行以下操作:

  const modalRef = this.modalService.open(ModalComponent);
  
  modalRef.componentInstance.passedData= this.dataToPass;
  
  modalRef.result.then(result => {
    //do something with result
  }                                                       
  

• 在模态组件(接收端):

  export class ModalComponent { 
  
   passedData: typeOfData;     // declare it!
  
   someFunction() {     // or some  lifecycle hook 
    console.log(this.passedData)  // and then, use it!
   }
  
  // rest of the ModalComponent 
  }
  

Answer 2

只需提供一个服务并将其注入VideoModalComponent即可PageComponent使用该服务进行通信。

有关更多详细信息和示例，请参阅https://angular.io/docs/ts/latest/cookbook/component-communication.html#!#bidirection-service 。