Scroll listener on body

Question

I would like to ask about scroll listener. I want to add scroll listener on body but it seems doesnt work.

$('body').scroll(function(){
  console.log('SCROLL BODY');
});

I create basic example on fiddle, can someone explain me why it doesn't to work? Sorry for nubies question...

Answer 1

Because the body isn't scrolling, the window is.

In This example, you'll see that the event listener bound to the parent container is what's firing, because that element is the one that's actually scrolling.

The HTML looks like this:

<div id="container">
    <p id="content">some text</p>
</div>

The CSS looks like this:

#container {
    height: 200px;
    overflow-y: scroll;
}

#content {
    height: 1000px;
}

And the relevant JS looks like this:

$('#container').on('scroll', function() {
    console.log('#container');
});

$('#content').on('scroll', function() {
    console.log('#content');
});

Answer 2

Try with:

$(window).scroll(function(){
  console.log('SCROLL BODY');
});

This should be supported by all browsers.

Answer 3

All the answers above expect jQuery being the framework of use. A framework agnostic / plain JS implementation could look like this

ES 5:

// ES 5 :
document.getElementsByTagName('body')[0].onscroll = function() {
    console.log("scrolling");
};

ES 6 (and above) :

// ES 6 (and above)
document.getElementsByTagName('body')[0].onscroll = () => {
    console.log("scrolling");
};