(function( $ ) {
	'use strict';

	$.fn.initWhenBox = function(options) {
		var settings = $.extend({
			from_date_id: undefined,
            to_date_id: undefined,
            from_time_id: undefined,
            to_time_id: undefined
		}, options);

		var box = $(this);

		var from_date = $('#' + settings.from_date_id, box);
		if (!from_date.length) {
			alert('From Date Element was not found.');
			return;
		}

		var to_date = $('#' + settings.to_date_id, box);
        if (!to_date.length) {
            alert('To Date Element was not found.');
            return;
        }

        var on_from_date_change = function () {
        	to_date.prop('min', this.value);
        };

        var on_to_date_change = function () {
            from_date.prop('max', this.value);
        };

        from_date.on('change', on_from_date_change);
        to_date.on('change', on_to_date_change);

    };

})( jQuery );