Form validation is not working in angular?

Question

I want to check whether the dropdown is empty.

Need to show the required message and

If not empty, enable the submit button.

If empty, disable the

Answer 1

To make the submit button disabled (link)

Add

In order to check whether the dropdown is empty or not, you need to make the form fields required like

this.myForm = this.formBuilder.group({
  'name': [this.name, Validators.required],
  'symbol': [this.symbol, [Validators.required]]
});

Inorder to show the error highlight you need to add an ngClass in the templete like.

[ngClass]="{'error': myForm.controls.name.valid == false}"