jQuery .scrollTop(); + animation

Question

I set the page to scroll to top when a button is clicked. But first I used an if statement to see if the top of the page was not set to 0. Then if it's not 0 I animate the page to scroll to the top.

var body = $("body");
var top = body.scrollTop() // Get position of the body

if(top!=0)
{
  body.animate({scrollTop:0}, '500');
}

The tricky part now is animating something AFTER the page has scrolled to the top. So my next thought is, find out what the page position is. So I used console log to find out.

console.log(top);  // the result was 365

This gave me a result of 365, I'm guessing that is the position number I was at just before scrolling to the top.

My question is how do I set the position to be 0, so that I can add another animation that runs once the page is at 0?

Thanks!

Answer 1

To do this, you can set a callback function for the animate command which will execute after the scroll animation has finished.

For example:

var body = $("html, body");
body.stop().animate({scrollTop:0}, 500, 'swing', function() { 
   alert("Finished animating");
});

Where that alert code is, you can execute more javascript to add in further animation.

Also, the 'swing' is there to set the easing. Check out http://api.jquery.com/animate/ for more info.