I want to be able, when scrolling down, to go directly to the next div, and when scrolling up, to go directly to the previous div. Here are my files with an example with two divs:

$(document).ready(function() {
  var lastScrollTop = 0;

  function findPos(obj) {
    var curtop = 0;
    if (obj.offsetParent) {
      do {
        curtop += obj.offsetTop;
      } while (obj = obj.offsetParent);
      return [curtop];
    }
  }

  $(window).scroll(function(event) {
    var st = $(this).scrollTop();
    if (st > lastScrollTop) {
      $('html, body').animate({
        scrollTop: $("#space_od").offset().top
      }, 500);
    } else {
      $('html, body').animate({
        scrollTop: $("#black_hole").offset().top
      }, 500);
    }
    lastScrollTop = st;
  });
});

body {
  padding: 0;
  margin: 0;
}

#black_hole {
  background-image: url("black_hole.jpg");
  background-position: center;
  display: block;
  height: 100vh;
  width: 100%;
}

#space_od {
  background-image: url("2001.png");
  background-position: center;
  display: block;
  height: 100vh;
  width: 100%;
}

<script src=".1.1/jquery.min.js"></script>
<div id="black_hole">
</div>
<div id="space_od">
</div>

I want to be able, when scrolling down, to go directly to the next div, and when scrolling up, to go directly to the previous div. Here are my files with an example with two divs:

$(document).ready(function() {
  var lastScrollTop = 0;

  function findPos(obj) {
    var curtop = 0;
    if (obj.offsetParent) {
      do {
        curtop += obj.offsetTop;
      } while (obj = obj.offsetParent);
      return [curtop];
    }
  }

  $(window).scroll(function(event) {
    var st = $(this).scrollTop();
    if (st > lastScrollTop) {
      $('html, body').animate({
        scrollTop: $("#space_od").offset().top
      }, 500);
    } else {
      $('html, body').animate({
        scrollTop: $("#black_hole").offset().top
      }, 500);
    }
    lastScrollTop = st;
  });
});

body {
  padding: 0;
  margin: 0;
}

#black_hole {
  background-image: url("black_hole.jpg");
  background-position: center;
  display: block;
  height: 100vh;
  width: 100%;
}

#space_od {
  background-image: url("2001.png");
  background-position: center;
  display: block;
  height: 100vh;
  width: 100%;
}

<script src="https://ajax.googleapis./ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="black_hole">
</div>
<div id="space_od">
</div>

It seems to work fine when scrolling down the first time, but not when scrolling up, it seems to move a few pixels and then stop. Any ideas?

• javascript
• jquery
• html
• css
• scroll

Share Improve this question Follow edited Aug 18, 2017 at 15:10 H. Pauwelyn 14.3k2828 gold badges9292 silver badges161161 bronze badges asked Aug 9, 2015 at 15:22 Antoni4040Antoni4040 2,3191111 gold badges4545 silver badges5656 bronze badges 3

• I've had to do this several times and have never seen a concise implementation. This library has worked well for me: github./zynga/scroller. This one, github./peachananr/onepage-scroll, is also popular on GitHub but I don't like the API as much. – rojobuffalo Commented Aug 9, 2015 at 15:44
• possible duplicate of stackoverflow./questions/11171828/… – Roko C. Buljan Commented Aug 9, 2015 at 15:46
• Fiddle example: jsfiddle/r3x7r/410 – Roko C. Buljan Commented Aug 9, 2015 at 15:46

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 6

scrollTo is a class to add to the divs you need to scroll to:

<div id="black_hole" class="scrollTo">

</div>
<div id="space_od" class="scrollTo">

</div>

Js

var scrolling = false;
var currentPos = 0;

    function scrollUp(){
        if(!scrolling && currentPos > 0 ){
            scrolling=true;
            currentPos --;
            var scrollToElement = $('.scrollTo')[currentPos];

            $('html, body').animate({
                scrollTop: $(scrollToElement).offset().top
            }, 500, function(){
                scrolling = false;
            });      
        }
    }   

    function scrollDown(){   
        if(!scrolling && currentPos < $('.scrollTo').length-1  ){
            scrolling=true;
            currentPos ++;
            var scrollToElement = $('.scrollTo')[currentPos];

            $('html, body').animate({
                scrollTop: $(scrollToElement).offset().top
            }, 500,function(){
                scrolling = false;
            }); 
        }
    }    

    $(document).ready(function() {

        // Get the current position on load

        for( var i = 0; i < $('.scrollTo').length; i++){
            var elm = $('.scrollTo')[i];

            if( $(document).scrollTop() >= $(elm).offset().top ){
                currentPos = i;
            }
        }

        $(document).bind('DOMMouseScroll', function(e){
            if(e.originalEvent.detail > 0) {
                scrollDown();
            }else {
                scrollUp();   
            }
            return false;
        });

        $(document).bind('mousewheel', function(e){
            if(e.originalEvent.wheelDelta < 0) {
                scrollDown();
            }else {
                scrollUp();     
            }
            return false;
        });
    });