Question

This code below is good with default animation. But it’s too fast.

pnlDataInput.el.slideIn('t');

So I give it a custom duration. And it never animation with any duration value. It just show up.

pnlDataInput.el.slideIn('t', {
            duration: 4
        });

Answer 1

Either the duration may be in milliseconds:

pnlDataInput.el.slideIn('t', {
        duration: 4000
    });

Or you may need an easing option:

pnlDataInput.el.slideIn('t', {
        easing: 'easeOut',
        duration: 4
    });