JavaScript What is the purpose of `complete` argument?

Some jQuery animation methods take an argument described as complete, which is a function that is to be called once the animation is done. For example:

$(obj).slideUp(duration, easing, complete());

How is this different from calling complete after the animation as below?

$(obj).slideUp(duration, easing)
.complete();
Answer:1
$(obj).slideUp(duration, easing, complete());

This is wrong. This is calling complete before slideUp is even called.

$(obj).slideUp(duration, easing);
complete();

This executes slideUp and immediately afterwards calls complete. The slideUp animation may not (in fact, surely will not) yet be finished by the time complete is called.

$(obj).slideUp(duration, easing, function () {
    alert('Complete!');
});

// or

$(obj).slideUp(duration, easing, complete);
                                     // ^^ look ma, no () !

Now this is how you're supposed to use it. "Complete!" will be alerted after and only after the slideUp animation has finished.

Answer:2

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