The element must disappear when the page nears the end

Question

I have this JS code for adding and removing classes when scrolling down from the top of the page, but what I want to do is disappear when you get near the end of the page or go back and revert to the old state after some scrolling (eg, From right: 7px to right: -150px). I copied the same JS code and changed scrollTop > rollBottom but it doesn't work.

jQuery(document).on('scroll', (e) => {
  if (document.body.scrollTop > 120 || document.documentElement.scrollTop > 350) {
    console.log('now');
    jQuery('.ast-below-header-bar').addClass('filterr');
  } else {
    console.log('no');
    jQuery('.ast-below-header-bar').removeClass('filterr');
  }
})

body {
  height: 500vh
}

.ast-below-header-bar {
  display: grid;
  position: fixed;
  right: -150px;
  top: 14%;
  background: red;
  height: 200px;
  width: 200px;
  transition: .3s;
}

.ast-below-header-bar.filterr {
  right: 7px!important;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="ast-below-header-bar"></div>

Answer 1

You can use window.innerHeight to perform calculations at the bottom of the scroll.

Adjust to your needs.

jQuery(document).on('scroll', (e) => {
  if ((window.innerHeight + window.pageYOffset + 350) <= document.body.offsetHeight && document.documentElement.scrollTop > 350) {
    console.log('now');
    jQuery('.ast-below-header-bar').addClass('filterr');
  } else {
    console.log('no');
    jQuery('.ast-below-header-bar').removeClass('filterr');
  }
})

body {
  height: 500vh
}

.ast-below-header-bar {
  display: grid;
  position: fixed;
  right: -150px;
  top: 14%;
  background: red;
  height: 200px;
  width: 200px;
  transition: .3s;
}

.ast-below-header-bar.filterr {
  right: 7px!important;
}

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