In Angular interfaces, including an optional ID can result in an error where a number of undefined type cannot be assigned to a parameter expecting

One key feature of my interface is the presence of an optional Id:

export interface UserAccount{
    // User details
    id?: number;
    firstName: string;
    lastName: string;
    mail: string;
    genderId: number;
    gender?: Gender;
    password: string;
    userName: string;
    login: string;
    useraccountTypeId: number;
    userAccountType?: UserAccountType;
    name?: string;
    commercialmail?: string;
    phone?: string;
    vatnumber?: string;
    truckId?: number;
    truck?: Truck;
}

This particular interface is utilized for creating and updating user profiles. However, a common issue arises when attempting to utilize the Id in the HTML section; resulting in the error message: "argument of type number undefined is not assignable to parameter of type number."

What strategies or best practices can be employed to avoid encountering this problem in the future? Any advice would be greatly appreciated.

Answer №1

Utilize the ngIf directive within your template code snippet.

Here's an example:

<ng-container *ngIf="id">
// This will only display if the id variable is defined and not empty
</ng-container>

Answer №2

Big thanks to hritik chokker for sharing this helpful solution:

<ng-container *ngIf="user.id">
  <button type="button" id="details" class="btn btn-details" (click)="getUserDetails(user.id)">View Details</button>    
</ng-container>

Hopefully this will assist others as well.

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