What is the most effective way to populate an empty instance of a class with values? For example, I have a User Class and need to create a new user. In my component, I initialize an empty User Object "user: User;". The constructor sets some properties, with some being optional. However, when trying to bind input forms to the undefined class instance using ngModel, it doesn't work. Setting default values in the component seems like a less than ideal solution.
Initialize your reactive form by setting the fields to empty strings, including the optional ones.
Make sure to specify which fields are optional in order for Angular to recognize them.
public username: AbstractControl;
public password: AbstractControl;
this.userForm = new FormGroup({
username: new FormControl('', [Validators.required]),
password: new FormControl('', [Validators.required])
});
Code example for input field:
<input type="text" name="username"
formControlName="username" class="form-control form-control-danger"
id="username" placeholder="Username" required autofocus>
Displaying form value:
<div>{{username.value || ''}}</div>
If a binding value is null or undefined, make sure to set it to an empty string to avoid errors.
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