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function Input(opt) {
	this._input = opt.el;

	if(this._isNotEmpty(this._input)) {

		this._input.addClass('is-active');
	}

	this._input.on('input change', this._addClass.bind(this));

}

Input.prototype._isNotEmpty = function(el) {
	return !!el.val();
};

Input.prototype._addClass = function(e) {
	var el = $(e.currentTarget);

	if(this._isNotEmpty(el)) {
		el.addClass('is-active');

	} else {
		el.removeClass('is-active');
	}
};


var input = new Input({
	el: $('.js-input')
});