ng-template, ng-container and ngTemplateOutlet examples

01.ts

@Component({
  selector: 'app-root',
  template: `      
      <ng-template>
          <button class="tab-button" 
                  (click)="login()">{{loginText}}</button>
          <button class="tab-button" 
                  (click)="signUp()">{{signUpText}}</button>
      </ng-template>
  `})
export class AppComponent {
    loginText = 'Login';
    signUpText = 'Sign Up'; 
    lessons = ['Lesson 1', 'Lessons 2'];

    login() {
        console.log('Login');
    }

    signUp() {
        console.log('Sign Up');
    }
}

02.ts

<div class="lessons-list" *ngIf="lessons else loading">
  ... 
</div>

<ng-template #loading>
    <div>Loading...</div>
</ng-template>

03.ts

<ng-template [ngIf]="lessons" [ngIfElse]="loading">
   <div class="lessons-list">
     ... 
   </div>
</ng-template>

<ng-template #loading>
    <div>Loading...</div>
</ng-template>

04.ts

<div class="lesson" *ngIf="lessons" 
       *ngFor="let lesson of lessons">
    <div class="lesson-detail">
        {{lesson | json}}
    </div>
</div>  

05.ts

<div *ngIf="lessons">
    <div class="lesson" *ngFor="let lesson of lessons">
        <div class="lesson-detail">
            {{lesson | json}}
        </div>
    </div>
</div>

06.ts

<ng-container *ngIf="lessons">
    <div class="lesson" *ngFor="let lesson of lessons">
        <div class="lesson-detail">
            {{lesson | json}}
        </div>
    </div>
</ng-container>

07.ts

<ng-container *ngTemplateOutlet="loading"></ng-container>

08.ts

@Component({
  selector: 'app-root',
  template: `      

<ng-template #estimateTemplate let-lessonsCounter="estimate">
    <div> Approximately {{lessonsCounter}} lessons ...</div>
</ng-template>

<ng-container 
   *ngTemplateOutlet="estimateTemplate;context:ctx">
</ng-container>
`})
export class AppComponent {

    totalEstimate = 10;
    ctx = {estimate: this.totalEstimate};
  
}

09.ts

@Component({
  selector: 'app-root',
  template: `      
      <ng-template #defaultTabButtons>

          <button class="tab-button" (click)="login()">
            {{loginText}}
          </button>

          <button class="tab-button" (click)="signUp()">
            {{signUpText}}
          </button>

      </ng-template>
`})
export class AppComponent implements OnInit {

    @ViewChild('defaultTabButtons')
    private defaultTabButtonsTpl: TemplateRef<any>;

    ngOnInit() {
        console.log(this.defaultTabButtonsTpl);
    }

}

      

10.ts

@Component({
  selector: 'app-root',
  template: `      
<ng-template #customTabButtons>
    <div class="custom-class">
        <button class="tab-button" (click)="login()">
          {{loginText}}
        </button>
        <button class="tab-button" (click)="signUp()">
          {{signUpText}}
        </button>
    </div>
</ng-template>
<tab-container [headerTemplate]="customTabButtons"></tab-container>      
`})
export class AppComponent implements OnInit {

}

11.ts

@Component({
    selector: 'tab-container',
    template: `
    
<ng-template #defaultTabButtons>
    
    <div class="default-tab-buttons">
        ...
    </div>
    
</ng-template>

<ng-container 
  *ngTemplateOutlet="headerTemplate ? headerTemplate: defaultTabButtons">
    
</ng-container>

... rest of tab container component ...

`})
export class TabContainerComponent {
    @Input()
    headerTemplate: TemplateRef<any>;
}

there's a semicolon missed in 2.ts, it should be
<div class="lessons-list" *ngIf="lessons; else loading">