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I have made a pie chart using css. This is the link to what I have made and now I want to make it animate on scroll, I have used this code

$(window).scroll(function () {
  $('.animation-test').each(function () {
      var imagePos = $(this).offset().top;
      var imageHeight = $(this).height();
      var topOfWindow = $(window).scrollTop();

      if (imagePos < topOfWindow + imageHeight && imagePos + imageHeight > topOfWindow) {
          $(this).addClass("slice-right");
      } else {
          $(this).removeClass("slice-right");
      }
   });
});

But it's not working, why?

Try changing your if condition to this

if (imagePos < (topOfWindow + imageHeight )&& (imagePos + imageHeight) > topOfWindow)

Showing on scroll​​ The idea is to check, as the page is scrolled, for any special elements we want to animate. If any of these special elements are visible, we can give them a special class and use CSS to animate or transition them into view. In the scroll.css file in the stylesheets folder we find some initial styles for the photos. Let’s set these up to be animated by making a few changes. Let’s set these up to be animated by making a few changes.

I suggest you try this out, change 100 to the number of pixels that have to be scrolled downwards in order to let the animation happen

$(window).scroll(function() {
    var height = $(window).scrollTop();

    if(height  > 100) {
        $(this).addClass("slice-right");

    }else{
        $(this).addClass("slice-right");
    }
});

down the page. If you only want this behavior inside a container, apply it to that element. Otherwise, apply it to the whole document. The scroll load animation we are going to implement require 2 different scripts. 1. CSS Animate –  This is an amazing library of CSS animation effects. This gives us an easy way to implement css animations by assigning custom class names to elements.

This should work for what you need. You may have to create some if statements if the height axis point of trigger will be different between mobile and desktop.

JS Bin Example here

$(window).scroll(function() {
var height = $(window).scrollTop();
console.log(height);
if(height  > 200) {
    $(".item").addClass("item--newColor");
    $(".item").removeClass("item--color");
}});

Try changing your if condition to this. if (imagePos < (topOfWindow + imageHeight )&& (imagePos + imageHeight) > topOfWindow). We have built eight different types of CSS fade-in transition on the scroll which included, fade-in left, fade-in the right, fade-in the bottom and fade-in top, etc. You can easily implement on page load animation on your website elements such as div, images, icons, and background.

Learn more by taking a Webucator CSS course. Here's a link to our CSS classes which are Duration: 2:38 Posted: Oct 14, 2015 If you are using a custom animation css instead of animate.css then you have to tweak the above line and use an option flag to use a different animation trigger other than ‘animated’ (see the codepen source since it has that option) All the hard work is now done. Now just add the appropriate CSS too items you want to animate on scroll.

<h2><a href="http://webbb.be/blog/trigger-css-animation-scroll/" title="Trigger CSS animations on scroll">Read the tutorial about 'reveal animations on  Simon Codrington explains how to use jQuery and CSS3 to add scroll-based animations to your site and thereby offer your users a more engaging experience.

Getting Started; Static Animations; Scroll Animations; Click Animations; Funky This minimizes load time and keeps everything simple.* In order to activate a CSS animation, a class needs to be added to the element when this becomes visible. As other answers have indicated, JS is required for this and Waypoints is a JS script that can be used. Waypoints is the easiest way to trigger a function when you scroll to an element.