Validation on blur with AngularJS

angular-invalid.js

// Make a custom "invalid" class that goes away
// when an element is focused.
var setupValidation = function(selector) {
	$(selector).blur(function() {
		var elm = $(this);
		if (isInvalid(elm)) {
			elm.addClass("invalid");
		}
	});

	$(selector).focus(function() {
		$(this).removeClass("invalid");
	});
};

var isInvalid = function(elm) {
	return (elm.hasClass("ng-invalid") && !elm.hasClass("ng-pristine"));
};