Loader with text/font caracters
// Prepare loader
var loaderSymbols = ['', '', ''],
loaderEl = $(blockingOverlaySelector + ' span'),
loaderIndex = 0,
loader = function() {
loaderEl.html(loaderSymbols[loaderIndex]);
loaderIndex = loaderIndex < loaderSymbols.length - 1 ? loaderIndex + 1 : 0;
};
setInterval(loader, 350);