如何在 ng-container 中使用 ngIfThen

Question

I'm building a simple rock, paper, scissors app. The moment I click a button (rock/paper/scissor), it will say: "You picked ... ". After that it should hide the other 2 buttons.

I want to go for the option to hide the whole ng-container. Is there a way I can hide the ng-container after clicking on one of the buttons? So add it in the *ngIfThen statement?

<div *ngIf="hand==='rock' then rockTemplate"></div>
<div *ngIf="hand==='paper' then paperTemplate"></div>
<div *ngIf="hand==='scissors' then scissorTemplate"></div>
<ng-template #rockTemplate>
  You picked: <app-rock></app-rock>
</ng-template>
<ng-template #paperTemplate>
  You picked: <app-paper></app-paper>
</ng-template>
<ng-template #scissorTemplate>
  You picked: <app-scissors></app-scissors>
</ng-template>


<ng-container #hideContainer class="board">
  <app-rock (click)="pickHand('rock')"></app-rock>
  <app-paper (click)="pickHand('paper')"></app-paper>
  <app-scissors (click)="pickHand('scissors')"></app-scissors>
</ng-container>

Answer 1

I think you can simplify with ng-switch :

<div [ngSwitch]="hand">
  <div *ngSwitchCase="rock">You picked: <app-rock></app-rock></div>
  <div *ngSwitchCase="paper">You picked: <app-paper></app-paper></div>
  <div *ngSwitchCase="scissors">You picked: <app-scissors></app-scissors> 
</div>
<ng-container *ngIf="!hasSelection" class="board">
  <app-rock (click)="pickHand('rock')"></app-rock>
  <app-paper (click)="pickHand('paper')"></app-paper>
  <app-scissors (click)="pickHand('scissors')"></app-scissors>
</ng-container>


// In your component class
hasSelection: boolean;
hand: 'rock' | 'scissors' | 'paper';

// ...
pickHand(type: 'rock' | 'scissors' | 'paper') {
  this.hasSelection = true;
  this.hand = type;
}

With ng-switch your template looks much cleaner and easier to read. You can show/hide the ng-container through a boolean variable that gets toggled once the user selects one hand type.

I do not know your logic, but you have to re-enable the ng-container , if the user has the possibility to choose an hand again.