AngularJS Developer Guide - Forms lists many styles and directives regarding forms and fields. For each one, a CSS class:
ng-valid
ng-invalid
ng-pristine
ng-dirty
ng-touched
ng-untouched
What's the difference between pristine/dirty, and touched/untouched?
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.