form has error css before touched angular code example

Example 1: angularjs show form validation errors

  
 {{ key }} errors
    

      
{{ e.$name }} has an error: {{ key }}.
    
  

Example 2: formgroup check if valid

form: FormGroup;

onSubmit(){
    //checks if form is valid
       if( this.form.valid){
          //more code here
        }
}