Extending Angular number inputs to validate for step attribute

myApp.js

angular
	.module('myApp', [])
	.directive("step", function() {
		return {
			restrict: "A",
			require: "ngModel",
			link: function(scope, element, attributes, ngModelCtrl) {
				ngModelCtrl.$validators.step = function(modelValue, viewValue) {
					var isValid = true; // assumed innocent until proven guilty
					if ( ! ngModelCtrl.$isEmpty(modelValue) ) { // empty is okay
						var $element = $(element); // jQuery? that's lame, you hack
						var value = parseFloat($element.val());
						var min = $element.attr("min") || 1;
						var max = $element.attr("max") || value;
						if (    value            // don't flag value of zero
						     && value >= min     // only flag increment if they've met the minimum
						     && value <= max ) { // only flag increment if they've met the maximum
							var step = $element.attr("step") || 1;
							if (value % step) {
								isValid = false;
							}
						}
					}
					return isValid;
				}
			}
		};
	});