Use TypeScript enums in Angular templates

10xTeam • November 08, 2023 • 2 min read •

TypeScript enums can be used in Angular templates to provide a more readable and maintainable way to work with predefined sets of values. Here’s how to use TypeScript enums in Angular templates:

1. Define the Enum in TypeScript:

Create an enum type in your TypeScript file. For example, to define an enum for different colors:

export enum Color {
  Red,
  Green,
  Blue
}

2. Import the Enum in Your Component:

Import the enum into the component where you want to use it. For example, if your enum is defined in a file called colors.enum.ts, import it in your component’s TypeScript file:

import { Color } from './colors.enum';

3. Access Enum Values in the Template:

Access the enum values in your component’s HTML template using the enum type’s name and the dot notation. For example, to display the names of the colors:

<ul>
  <li></li>
  <li></li>
  <li></li>
</ul>

4. Use Enum Values in Data Binding:

Use enum values in data binding expressions. For example, to bind the color of an element to an enum value:

<button [style.background-color]="selectedColor">Select Color</button>

In your component’s TypeScript file, define a property of the enum type:

selectedColor: Color = Color.Red;

5. Use Enum Values in Conditional Statements:

Use enum values in conditional statements to control the rendering of elements based on enum values. For example, to display different text based on the selected color:

<div *ngIf="selectedColor === Color.Red">You selected Red color.</div>
<div *ngIf="selectedColor === Color.Green">You selected Green color.</div>
<div *ngIf="selectedColor === Color.Blue">You selected Blue color.</div>

By following these steps, you can effectively utilize TypeScript enums in your Angular templates to enhance code readability and maintainability.