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toggle function

toggleClass is executed immediately and so you don't need a callback for toggleClass, just place the alert('a') in the next line which will alert after toggleClass is executed.

Edit: Looks like you want jQuery UI Effects - toggleClass which unfortunately doesn't have a callback function.

Probably you should write your own toggle function. See below for fadeIn/fadeOut toggle,


qiita.rb


var $loader = $("#loader");
if ($loader.is(':visible')) {
$loader.fadeOut(100, function () {
alert('fade out complete');
});
} else {
$loader.fadeIn(100, function () {
alert('fadeIn complete');
});
}