AngularJS - difference between pristine/dirty and touched/untouched

Question

AngularJS Developer Guide - Forms tell there are many styles and directives regarding forms and fields. For each one, a CSS class:

ng-valid
ng-invalid
ng-pri         


        

Answer 1

AngularJS Developer Guide - CSS classes used by AngularJS

• @property {boolean} $untouched True if control has not lost focus yet.
• @property {boolean} $touched True if control has lost focus.
• @property {boolean} $pristine True if user has not interacted with the control yet.
• @property {boolean} $dirty True if user has already interacted with the control.