Example formatters

rivets.formatters.shortdate = function (value) {
	return moment(value).format('YYYY-MM-DD');
};

rivets.formatters.number = function (value) {
	return +value;
};

rivets.formatters.string = function (value) {
	return String(value);
};

Boolean negation

rivets.formatters.negate = function (value) {
	return !value;
};

data-class-disabled="model.valid | negate"

Equals

rivets.formatters.eq = function (value, args) {
	return value === args;
};

data-class-disable="model.foo | number | eq 4"

Not equal

rivets.formatters.not_eq = function (value, args) {
	return value != args;
};	

data-class-disable="model.foo | not_eq 4"

Greater than

rivets.formatters.gt = function(value, arg) {
	return value > arg;
};

data-class-disable="model.foo | gt 4"

Lower than

rivets.formatters.lt = function(value, arg) {
	return value < arg;
};

data-class-disable="model.foo | lt 4"

Blank

rivets.formatters.blank = function (value) {
	return value == null || value === "";
};

data-hide="model.foo | blank"

Event handler preventDefault

rivets.formatters.preventDefault = function(value) {
  return function(e) {
    e.preventDefault();
    value.call(this, e);
    return false;
  };
};

data-on-submit="model:save | preventDefault"