loading spinner

LoadingSpinner.js

/*!
 * loading spinner
 * dependent on setAutoClearedTimeout
 * gist.github.com/englishextra/24ef040fbda405f7468da70e4f3b69e7
 * @param {Object} [cb] callback function
 * @param {Int} [n] any positive whole number, default: 500
 * LoadingSpinner.show();
 * LoadingSpinner.hide(cb,n);
 */
var LoadingSpinner = function () {
	"use strict";
	var h = BALA.one("html") || "",
	cls = "loading-spinner",
	a = BALA.one("." + cls) || "",
	cL = "classList";
	if (!a) {
		a = crel("div");
		a[cL].add(cls);
		appendFragment(a, h);
	};
	return {
		show : function () {
			return h[cL].contains(cls) || h[cL].add(cls);
		},
		hide : function (cb, n) {
			n = n || 500;
			var s = function () {
				setAutoClearedTimeout(function () {
					h[cL].remove(cls);
					cb && "function" === typeof cb && cb();
				}, n);
			};
			return s();
		}
	};
}
();