What is the best way to pass an enum value as a parameter to a function in an Angular template?

One of the challenges I am currently facing is integrating an enum into my HTML file. Here is the enum in question:

export enum CartAction {
  ADD = 'ADD',
  REMOVE = 'REMOVE',
}

In the component's TypeScript file, it is being utilized as follows:

 async cartAction(action: CartAction): Promise<void> {
    if (action === CartAction.ADD) {
    }
    if (action === CartAction.REMOVE) {
    }
  }

I aim to use this enum directly within the HTML file, like this:

<button (click)="cartAction(someCondition? CartAction.ADD : CartAction.REMOVE )">text</button>

However, when attempting to do so, I encounter the error message:

Property 'CartAction' does not exist on type 'MyPage'. 
Did you mean 'someOtherAction'?ngtsc(2551)

How can I navigate through and resolve this issue?

Answer №1

In order to utilize items in your template files, they must be made public (or protected starting from Angular 15) for accessibility, which imports are not.

My approach has been to expose the enum in my component:

protected cartActions = CartActions;

By doing so, you can use it in the following manner:

<button (click)="cartAction(someCondition? cartAction.ADD : cartAction.REMOVE )">text</button>

Answer №2

To make it accessible as a component property, you need to declare it within the component itself.

class YourComponent {
      CardAction = CardAction
}

This solution should work, but personally, I believe that keeping the logic within the component code is a better practice than cluttering the template with unnecessary code.

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