Add scroll percentage calculation

Author: konard

example/components/chakra-boxes.tsx

@@ -1,6 +1,5 @@
 import React, { useState, useEffect, useRef } from "react";
-import { Box, Input, VStack } from "@chakra-ui/react";
-
+import { Box, Input, VStack, Text } from "@chakra-ui/react";
 import { motion } from "framer-motion";
 
 const MotionBox = motion(Box as any);
@@ -11,6 +10,7 @@ const indentations = Array.from({ length: numBoxes }, (_, i) => i * 100);
 const ChakraBoxes = () => {
   const [highlightedIndex, setHighlightedIndex] = useState(null); // Index of the box in the center
   const [offset, setOffset] = useState(0);
+  const [scrollPercentage, setScrollPercentage] = useState(0); // State for scroll percentage
   const boxRefs = useRef([]); // Ref array to hold references to each box
   const canvasRef = useRef();
 
@@ -41,34 +41,48 @@ const ChakraBoxes = () => {
     setOffset(indentations[closestIndex]);
   };
 
+  const calculateScrollPercentage = () => {
+    const scrollTop = window.scrollY; // Distance from the top
+    const docHeight = document.documentElement.scrollHeight; // Full document height
+    const winHeight = window.innerHeight; // Visible window height
+
+    const totalScrollable = docHeight - winHeight;
+    const scrolled = (scrollTop / totalScrollable) * 100;
+
+    setScrollPercentage(scrolled);
+  };
+
   useEffect(() => {
     // Call the function initially and on scroll
     calculateClosestBoxToCenter();
+    calculateScrollPercentage();
+
     window.addEventListener('scroll', calculateClosestBoxToCenter);
+    window.addEventListener('scroll', calculateScrollPercentage);
 
     // Cleanup the scroll event listener on component unmount
     return () => {
       window.removeEventListener('scroll', calculateClosestBoxToCenter);
+      window.removeEventListener('scroll', calculateScrollPercentage);
     };
   }, [numBoxes]);
 
   return (
     <Box overflowX={'hidden'}>
+      <Text position="fixed" top={0} left={0} p={4} fontSize="lg" bg="white" zIndex={1}>
+        Scroll Percentage: {scrollPercentage.toFixed(2)}%
+      </Text>
       <MotionBox
         ref={canvasRef}
         animate={{ marginLeft: `${-offset}px` }} // Animation on margin change
         transition={{
           duration: 0.4,
-          // ease: "easeIn", // Built-in easing function
           ease: "easeOut", // Built-in easing function
-          // ease: "linear", // Built-in easing function
         }} // Adjust the transition duration
         paddingTop={`50vh`}
         paddingBottom={`50vh`}
       >
-        <VStack
-          spacing={4}
-        >
+        <VStack spacing={4}>
           {Array.from({ length: numBoxes }).map((_, index) => (
             <Box
               key={index}