Determine the scale and position adjustments by assessing the pageYOffset

Currently, I am faced with the following dilemma:

I possess an object along with its initial position;

Upon the initiation of page scrolling, my goal is to have this object move downwards towards the center. Once the scroll reaches 100vh (referred to as 'sectionHeight' in the provided example), the objective is for the object to be positioned perfectly at the screen's center and expand by 1.49 times its original size.

The challenge lies in the mathematical aspect as I am struggling to devise a suitable method for calculating the object's trajectory. Thus far, the code snippet I have developed for adjusting the position consists of somewhat arbitrary values in an attempt to achieve the desired outcome:

if(window.pageYOffset < sectionHeight && window.pageYOffset > 0) {
            productToExpand.style.position = 'absolute';
            productToExpand.style.top = productToExpandPosition.top + window.pageYOffset + 'px';
            productToExpand.style.left = productToExpandPosition.left + window.pageYOffset / 2 + 'px';
        } else if(window.pageYOffset === 0) {
            productToExpand.style.position = 'unset';
        }   else if (window.pageYOffset > sectionHeight) {
            productToExpand.style.top = 1.5 * sectionHeight - productImageToExpand.offsetHeight / 2 + 'px';
            productToExpand.style.left = 'calc(50% -' + ' ' + (productImageToExpand.offsetWidth / 2 + productToExpandPositionLeft) + 'px)';
        }

Furthermore, determining the appropriate formula for resizing the object poses another challenge. Any assistance in addressing these issues would be greatly appreciated.

javascripthtmlcss

Answer №1

After thoroughly analyzing your request, I have integrated certain portions of your code while introducing new elements as well. Detailed comments have been provided alongside the modified code for clarity.

    var sectionHeight = vhToPixels(100); // defines the height of a section in pixels
    var sectionWidth = vwToPixels(100); // specifies the width of a section in pixels
    
    var productToExpand = document.getElementById('image1');
    var productToExpandPosition;
    var imgHeight = productToExpand.clientHeight;
    var imgWidth = productToExpand.clientWidth;
    
    var multiplier;
    
    window.onscroll = function() {myFunction()};
    
    function myFunction() {
        if(window.pageYOffset < sectionHeight && window.pageYOffset > 0) {
            productToExpand.style.position = 'absolute';
            productToExpand.style.top =  window.pageYOffset + 'px'; // adjusts position based on scroll
            productToExpand.style.left =  window.pageYOffset / 2 + 'px'; // determines left position
            
            if((window.pageYOffset/500)  < 1) {
                multiplier = 1;
            }
            else {
                multiplier = (window.pageYOffset/500);
            }
            
            productToExpand.style.height = imgHeight * multiplier  + "px"; // sets dynamic height
            productToExpand.style.width = imgWidth * multiplier + "px"; // sets dynamic width
            
        } else if(window.pageYOffset === 0) {
            productToExpand.style.position = 'unset';
            productToExpand.style.height = imgHeight  + "px";
            productToExpand.style.width = imgWidth  + "px";                
        }   else if (window.pageYOffset > sectionHeight) {
            productToExpand.style.top = 1.5 * sectionHeight - productToExpand.offsetHeight / 2 + 'px'; // aligns top position
            productToExpand.style.left = sectionWidth + ' ' + (productToExpand.offsetWidth / 2 ) + 'px)';
            productToExpand.style.height = imgHeight * 1.49 + "px"; // adjusts height
            productToExpand.style.width = imgWidth * 1.49 + "px"; // adjusts width
        }            
        
    }
    
    function vhToPixels (vh) {
        return Math.round(window.innerHeight / (100 / vh)); // converts viewport height to pixels
    }
	
    function vwToPixels (vw) {
        return Math.round(window.innerWidth / (100 / vw)); // converts viewport width to pixels
    }

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