从父组件调用的子组件内的Angular 2 ng2-bootstrap modal

Question

这很难解释。我有一个简单的工作 ng2-bootstrap 模态示例。我将其扩展为包含用于我的主页的 Boostrap 4 Jumbotron 示例模板，现在 ng2-bootstrap 模式什么也不做。我可以看到 子模式组件中的this.childModal.show() 在按钮单击时被调用，但没有任何反应。 Chrome 控制台没有错误，也没有模式显示。我不知道下一步该做什么：-/

// ============================================================================
// /src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { ModalModule } from 'ng2-bootstrap/modal';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';

import { AppComponent } from './app.component';
import { DemoModalChildComponent } from './demo-modal-child.component';

@NgModule({
    declarations: [
        AppComponent, DemoModalChildComponent
    ],
    imports: [
        BrowserModule,
        FormsModule,
        HttpModule,
        NgbModule.forRoot(),
        ModalModule.forRoot()
    ],
    bootstrap: [AppComponent]
})
export class AppModule { }


// ============================================================================
// /src/app/app.component.ts

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

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    title = 'app works!';
}



<!-- ========================================================================== -->
<!-- /src/app/app.component.html -->

<nav class="navbar navbar-toggleable-md navbar-inverse fixed-top bg-inverse">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault"
        aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
        </button>
        <a class="navbar-brand" href="#">Navbar</a>

        <div class="collapse navbar-collapse" id="navbarsExampleDefault">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item active">
                    <a class="nav-link" href="/home">Home <span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" (click)="showLoginModal()">Login</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="/members">Players</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="/game">Game</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" href="#">Disabled</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="http://example.com" id="dropdown01" data-toggle="dropdown" aria-haspopup="true"
                        aria-expanded="false">Dropdown
                        </a>
                        <div class="dropdown-menu" aria-labelledby="dropdown01">
                            <a class="dropdown-item" href="#">Action</a>
                            <a class="dropdown-item" href="#">Another action</a>
                            <a class="dropdown-item" href="#">Something else here</a>
                        </div>
                </li>
            </ul>
            <form class="form-inline my-2 my-lg-0">
                <input class="form-control mr-sm-2" type="text" placeholder="Search">
                <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
            </form>
        </div>
</nav>

<!-- Main jumbotron for a primary marketing message or call to action -->
<div class="jumbotron">
    <div class="container">
        <demo-modal-child #c="child"></demo-modal-child>
        <button type="button" class="btn btn-primary" (click)="c.showChildModal()">Open child modal</button>
        <h1 class="display-3">Hello, world!</h1>
        <p>This is a template for a simple marketing or informational website. It includes a large callout called a jumbotron
            and three supporting pieces of content. Use it as a starting point to create something more unique.</p>
        <p><a class="btn btn-primary btn-lg" href="#" role="button">Learn more &raquo;</a></p>
    </div>
</div>
<!-- /jumbotron -->

<div class="container">
    <!-- Example row of columns -->
    <div class="row">
        <div class="col-md-4">
            <h2>Heading</h2>
            <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum
                nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed
                odio dui.
            </p>
            <p><a class="btn btn-secondary" href="#" role="button">View details &raquo;</a></p>
        </div>
        <div class="col-md-4">
            <h2>Heading</h2>
            <p>Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum
                nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed
                odio dui. </p>
            <p><a class="btn btn-secondary" href="#" role="button">View details &raquo;</a></p>
        </div>
        <div class="col-md-4">
            <h2>Heading</h2>
            <p>Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Vestibulum id ligula porta felis
                euismod semper. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa
                justo sit amet risus.</p>
            <p><a class="btn btn-secondary" href="#" role="button">View details &raquo;</a></p>
        </div>
    </div>

    <hr>

    <footer>
        <p>&copy; burnmarkGames 2017</p>
    </footer>
</div>
<!-- /container -->


// ============================================================================
// /src/app/demo-modal-child.component.ts

import { Component, ViewChild } from '@angular/core';
import { ModalDirective } from 'ng2-bootstrap/modal';

@Component({
    selector: 'demo-modal-child',
    templateUrl: './demo-modal-child.component.html',
    exportAs: 'child'
})
export class DemoModalChildComponent {
    @ViewChild('childModal') public childModal: ModalDirective;

    public showChildModal(): void {
        console.log('DemoModalChildComponent.showChildModal fired!');
        this.childModal.show();
    }

    public hideChildModal(): void {
        this.childModal.hide();
    }
}


<!-- ========================================================================== -->
<!-- /src/app/demo-modal-child.component.html -->

<div bsModal #childModal="bs-modal" class="modal fade" tabindex="-1" role="dialog"
    aria-labelledby="mySmallModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <div class="modal-header">
                <h4 class="modal-title pull-left">Please login...</h4>
                <button type="button" class="close pull-right" aria-label="Close" (click)="hideChildModal()">
          <span aria-hidden="true">&times;</span>
        </button>
            </div>
            <div class="modal-body">
                I am a child modal, opened from parent component!
            </div>
        </div>
    </div>
</div>

Answer 1

您的常用子模态组件如下所示

import {Component,Input, ViewChild} from '@angular/core';
import { ModalDirective } from 'ng2-bootstrap/ng2-bootstrap';

@Component({
  selector: 'common-modal',
  template: `
   <div bsModal #childModal="bs-modal" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
  <div class="modal-dialog modal-sm">
    <div class="modal-content">
      <div class="modal-header">
        <h4 class="modal-title pull-left">{{title}}</h4>
        <button type="button" class="close pull-right" aria-label="Close" (click)="hideChildModal()">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        <ng-content select=".modal-body"> </ng-content>
      </div>

      <div class="modal-footer">
        <div class="pull-left">
          <button class="btn btn-default" (click)="hide()"> Cancel </button>
        </div>
      </div>
    </div>
  </div>
</div>
  `,
})
export class CommonModalComponent {
   @ViewChild('childModal') public childModal:ModalDirective;
   @Input() title:string;
  constructor() {
  }
  show(){
    this.childModal.show();
  }
  hide(){
    this.childModal.hide();
  }
}

在父组件中使用子组件如下所示

import {Component, ViewChild, NgModule,ViewContainerRef} from '@angular/core'
import { BrowserModule } from '@angular/platform-browser';
import { ModalDirective,ModalModule } from 'ng2-bootstrap/ng2-bootstrap';
import {CommonModalComponent} from './child.modal';
@Component({
  selector: 'my-app',
  template: `
    <button type="button" class="btn btn-primary" (click)="childModal.show()">Open modal</button>
    <common-modal  #childModal [title]="'common modal'"> 
    <div class="modal-body">
    Hi heloo </div>
    </common-modal> 

  `,
})
export class AppComponent {
  @ViewChild('childModal') childModal :CommonModalComponent;
  constructor(private viewContainerRef: ViewContainerRef) {
  }

}

使用上面的代码，你可以有一个单独的通用模式对话框，可以重复使用，这样你的页眉和页脚保持不变，你可以使用 Content-Projection 来改变正文模态对话框。

LIVE DEMO