Tips for achieving a gradual transformation of an element according to the scrolling position

I have been experimenting with using waypoints for two specific purposes.

  1. The first objective is to determine whether a user is scrolling up or down and if the container comes into view. However, this functionality is not working as expected.

  2. The second goal I have in mind is slightly different and does not directly involve waypoints. I am aiming to make the image you see in the code snippet gradually transform: translateX based on the scroll progression. Unfortunately, I am unsure about how to achieve this effect. The inclusion of 'translate' in the snippet serves as an illustration of the desired movement.

When you visit this website and scroll down slightly to the "Nike and Snapchat" section, you will notice a phone image of Lebron James. As you continue to scroll either up or down, the image shifts accordingly. This is the behavior I am trying to emulate.

Does anyone have any suggestions on how I can accomplish this?

var homeMainSec = $('#homeMainSec');

homeMainSec.waypoint(function(direction) {
  if (direction === 'down') {
    $('#homeBoxGridRight img').addClass('slideLeftDisplay');
    console.log('Left Slide');
  }
}, {
  offset: '25%'
});
homeMainSec.waypoint(function(direction) {
  if (direction === 'up') {
    $('#homeBoxGridRight img').addClass('slideRightDisplay');
    console.log('Right Slide');
  }
}, {
  offset: '25%'
});
#homeMainSec {
width: 100%;
height: 95vh;
position: relative;
margin-top: 70px;
}
.homeMainBlock {
height: 100%;
width: 50%;
display: inline-block;
vertical-align: top;
box-sizing: border-box;
}
/*- HomeBoxGridRight Section -*/
#homeBoxGridRight img {
display: block;
width: 40%;
height: auto;
margin-left: 50%;
}
.slideLeftDisplay {
transform: translateX(-100px);-webkit-transform: translateX(-100px);
transition: 1s;-webkit-transition: 1s;
opacity: 1;
}
.slideRightDisplay {
transform: translateX(100px);-webkit-transform: translateX(100px);
transition: 1s;-webkit-transition: 1s;
opacity: 1;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/waypoints/4.0.1/jquery.waypoints.min.js"></script>
<section id="homeMainSec">
  <div class="homeMainBlock" id="homeBoxGridLeft">
  </div><div class="homeMainBlock" id="homeBoxGridRight">
    <img src="https://slidesjs.com/examples/standard/img/example-slide-1.jpg" alt="Image">
  </div>
</section>
<br><br><Br><br><br><br><br><br>

Answer №1

Get the current vertical scroll position of the page:

window.pageYOffset

Determine the total scrollable height of the body:

document.querySelector("body").scrollHeight

To calculate the correct scrollable height, subtract the offset height of the scrollbar element:

document.scrollingElement.offsetHeight

You can adjust elements based on the ratio of current scroll position to maximum scroll position:

window.pageYOffset/(document.querySelector("body").scrollHeight - document.scrollingElement.offsetHeight)

This ratio allows you to manipulate the elements in relation to their initial positions.

https://i.sstatic.net/aiVhb.png

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