Angular.js programmatically setting a form field to dirty

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In your case, $scope.myForm.username.$setViewValue($scope.myForm.username.$viewValue); does the trick – it makes both the form and the field dirty, and appends appropriate CSS classes.

Just to be honest, I found this solution in new post in the topic from the link from your question. It worked perfectly for me, so I am putting this here as a standalone answer to make it easier to be found.

EDIT:

Above solution works best for Angular version up to 1.3.3. Starting with 1.3.4 you should use newly exposed API method $setDirty() from ngModel.NgModelController.

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