ng2-bootstrap, call Modal defined in child component from parent compent

问题

I am using ng2-bootstrap for the modal stuff.

I am trying to separate my modals and my other components apart. So I have the following files:

addPlaylist.modal.ts

import {Component} from '@angular/core';
import {CORE_DIRECTIVES} from '@angular/common';


import {MODAL_DIRECTVES, BS_VIEW_PROVIDERS} from 'ng2-bootstrap/ng2-bootstrap';

@Component({
  selector: 'addplaylist-modal',
  directives: [MODAL_DIRECTVES, CORE_DIRECTIVES],
  viewProviders: [BS_VIEW_PROVIDERS],
  templateUrl: 'app/channel/modals/addPlaylistModal.html'
})

export class AddPlaylistModalComponent {
  constructor() {
    console.log(this);
  }
}

addPlaylistModal.html

<div bsModal #lgModal="bs-modal" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel" aria-hidden="true">
  <div class="modal-dialog modal-lg">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" (click)="lgModal.hide()" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
        <h4 class="modal-title">Large modal</h4>
      </div>
      <div class="modal-body">
        ...
      </div>
    </div>
  </div>
</div>

In it's parent component's html I have code piece like this:

  <a (click)="lgModal.show()"><span class="bigplus pull-right"></span></a>
   //some other code
  <addplaylist-modal></addplaylist-modal>

This is the parent component: channel.component.ts

import { AddPlaylistModalComponent } from './shared/addPlaylist.modal';

@Component({
  selector: 'channel',
  styleUrls: ['app/channel/channel.css'],
  directives: [PlatformsComponent, PagesComponent, PlaylistComponent, VideosComponent, AddPlaylistModalComponent],
  providers: [PlatformService],
  templateUrl: 'app/channel/channel.html'
})

What I want to do, I want to be able to let the parent componet to access it and open the modal even if I write the (click)="lgModal.show()" at parent component.

Now if I click the <a (click)="lgModal.show()"><span class="bigplus pull-right"></span></a> , it will say “ can not read property show of undefined"

So, how to let the parent component know that the lgModal is defined and it's in its child component.

回答1:

Your solution might look something like this:

ChildComponent

@Component({
  ...
  exportAs: 'child'  <== add this line
})
export class AddPlaylistModalComponent {
  @ViewChild('lgModal') lgModal; <== reference to Modal directive
  show(){   <== public method
    this.lgModal.show(); 
  }
}

ParentComponent

template: `<a class="btn btn-success" (click)="c.show()">Add</a>
           <addplaylist-modal #c="child"></addplaylist-modal>`

See also the completed sample here https://plnkr.co/edit/2UAB7lpqqAvchTsLwzr6?p=preview

来源：https://stackoverflow.com/questions/37888361/ng2-bootstrap-call-modal-defined-in-child-component-from-parent-compent

标签

javascript

typescript

angular

bootstrap-modal

ng2-bootstrap