AngularJS Directive To Allow Only Numbers and CTRL+C or CTRL+V

angular.numbers_only.js

.directive('numbersOnly', function () {
    return {
        restrict: 'A',
        link: function (scope, elm, attrs, ctrl) {
            // record ctrl key being down for ctrl+v and ctrl+c
            var ctrlDown = false;
            // reset the ctrl key flag on keyup
            elm.on('keyup', function (event) {
                ctrlDown = false;
            });
            elm.on('keydown', function (event) {
                if ([8, 13, 27, 37, 38, 39, 40].indexOf(event.which) > -1) {
                    // backspace, enter, escape, arrows
                    return true;
                } else if (event.which >= 48 && event.which <= 57) {
                    // numbers
                    return true;
                } else if (event.which >= 96 && event.which <= 105) {
                    // numpad number
                    return true;
                } else if (event.which === 17) {
                    // ctrl key or command key on a Mac
                    ctrlDown = true;
                } else if (ctrlDown && [86, 67].indexOf(event.which) > -1) {
                    // ctrl+c or ctrl+v
                    return true;
                } else {
                    event.preventDefault();
                    return false;
                }
            });
        }
    }
});

Nice job man. Helped allot. Next step could be some unit tests 😄