-------------------------
Original working directive
--------------------------
var sidenavDirective = angular.module('sidenavDirective', [])
	.directive('resize', function ($window) {
	    return {
        restrict: 'A',

        link: function (scope, elem, attrs) {

            var winHeight = $window.innerHeight;

            elem.css('height', winHeight + 'px');
        }
    };
});

-----------------------------
New Not working modified directive
-------------------------------
var sidenavDirective = angular.module('sidenavDirective', [])
	.directive('resize', function ($window) {
	    return {
        restrict: 'A',

        link: function (scope, elem, attrs) {
        	scope.$watch('window', function(newVal, oldVal){
        		if(newVal!== oldVal){
        			elem.css('height', winHeight + 'px');
        			scope.$apply();
        		}
        	});
        }

    };
});