In AngularJS, what's the difference between ng-pristine and ng-dirty?

Question

What are the differences between ng-pristine and ng-dirty? It seems you can have both to be true:

$scope.myForm.$prist         


        

Answer 1

As already stated in earlier answers, ng-pristine is for indicating that the field has not been modified, whereas ng-dirty is for telling it has been modified. Why need both?

Let's say we've got a form with phone and e-mail address among the fields. Either phone or e-mail is required, and you also have to notify the user when they've got invalid data in each field. This can be accomplished by using ng-dirty and ng-pristine together:

    
    
Phone or e-mail required
    

        E-mail is invalid
    

    
    
Phone or e-mail required
    

        Phone is invalid