ancestorClass.js

angular.module('...').directive('ancestorClass', function() {
    'use strict';

    function link(scope, element, attrs) {
        var targets = element.parents().filter(attrs.selector);
        scope.$watch(attrs.class, function(value) {
            for (var key in value) {
                targets.toggleClass(key, value[key]);
            }
        }, true);
    };

    return {
        link: link,
        restrict: 'E'
    };
});