Angular Templates: Structural Directives Micro-syntax

Use * shorthand for structural directives; Angular expands it to <ng-template>.

What is the Structural Directives micro-syntax?

• * is shorthand that expands to an underlying <ng-template>.
• Provides context variables (e.g., index as i, else).
• Angular rewrites *ngIf, *ngFor, etc., using this syntax.

When to use the micro-syntax

• With structural directives to add/remove DOM based on state.
• To iterate lists concisely with *ngFor.
• Use shorthand for readability; use explicit <ng-template> when needed.

Example

Use the * micro-syntax to expand structural directives and expose context variables:

<div *ngIf="ok; else other">OK</div>
<ng-template #other>Not OK</ng-template>
<li *ngFor="let item of items; index as i">{{ i }} {{ item }}</li>

Code explained

• *ngIf="ok; else other": Renders the block when ok is truthy; otherwise renders the #other template.
• *ngFor="...; index as i": Loops over items and exposes the zero‑based index as i.
• * shorthand: Angular rewrites *... into an underlying <ng-template>.

Example

Use micro-syntax with *ngIf and *ngFor to conditionally render or iterate:

import { bootstrapApplication } from '@angular/platform-browser';
import { Component } from '@angular/core';
import { CommonModule } from '@angular/common';

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [CommonModule],
  template: `
    <button (click)="ok = !ok">Toggle</button>
    <div *ngIf="ok; else other">OK</div>
    <ng-template #other>Not OK</ng-template>
    <ul>
      <li *ngFor="let item of items; index as i">{{ i }} - {{ item }}</li>
    </ul>
  `
})
export class App {
  ok = true;
  items = ['A','B','C'];
}

bootstrapApplication(App);

<app-root></app-root>

Example explained

• * shorthand: *ngIf and *ngFor are shorthand that Angular rewrites to an underlying <ng-template>.
• *ngIf="ok; else other": Renders the block when ok is true; otherwise renders the template referenced by #other.
• *ngFor="let item of items; index as i": Iterates the array items; item is the current element and i is the zero-based index.