angular - 如何在 Angular 4 中使用 ng-bootstrap 将数据模态组件传递给父组件

Question

我尝试在下面编写代码以将数据从模态组件传递到父组件。

package.json

"@ng-bootstrap/ng-bootstrap": "^1.0.0-beta.3"

app.component.html

<button class="btn btn-primary" (click)="openModal()">Open</button>

app.component.ts

import { NgbModal, NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';

export class AppComponent {

   constructor(private modalService: NgbModal) { }

    openModal() {
        const modalRef = this.modalService.open(AppModalComponent);
    }
}

app-modal.component.html

<h1>{{data}}</h1>
<button class="btn btn-primary" (click)="addMe()"></button>

app-modal.component.ts

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

export class AppModalComponent {
    private data: string;
    @Output emitService = new EventEmitter();

    constructor() {
        this.data = "hello world";
    }

    addMe() {
        this.emitService.next(this.data)
    }
}

emit之后，如何获取父组件(app.component)中的数据？？

Answer 1

你可以像这样订阅 emitService @Output:

openModal() {
     const modalRef = this.modalService.open(AppModalComponent);
     modalRef.componentInstance.emitService.subscribe((emmitedValue) => {
         // do sth with emmitedValue
     });
}

虽然上面的方法可行，但请注意，使用您要返回的值关闭模态通常更容易。这将解决 modalRef 上可用的 promise 。更多详细信息，请参阅 https://stackoverflow.com/a/43614501/1418796