27 - Click and Drag/index.html

<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<title>Click and Drag</title>
	<link rel="stylesheet" href="style.css">
</head>

<body>
	<div class="items">
		<div class="item item1">01</div>
		<div class="item item2">02</div>
		<div class="item item3">03</div>
		<div class="item item4">04</div>
		<div class="item item5">05</div>
		<div class="item item6">06</div>
		<div class="item item7">07</div>
		<div class="item item8">08</div>
		<div class="item item9">09</div>
		<div class="item item10">10</div>
		<div class="item item11">11</div>
		<div class="item item12">12</div>
		<div class="item item13">13</div>
		<div class="item item14">14</div>
		<div class="item item15">15</div>
		<div class="item item16">16</div>
		<div class="item item17">17</div>
		<div class="item item18">18</div>
		<div class="item item19">19</div>
		<div class="item item20">20</div>
		<div class="item item21">21</div>
		<div class="item item22">22</div>
		<div class="item item23">23</div>
		<div class="item item24">24</div>
		<div class="item item25">25</div>
	</div>

	<script>
		const slider = document.querySelector('.items');
		let isDown = false;
		let startX, scrollLeft;


		slider.addEventListener('mousedown', (e) => {
			isDown = true;
			slider.classList.add('active');
			
			startX = e.pageX - slider.offsetLeft;		// where was the initial click
			scrollLeft = slider.scrollLeft;					// where was the scholl initialy
			
		});

		slider.addEventListener('mouseleave', () => {
			isDown = false;
			slider.classList.remove('active');
		});

		slider.addEventListener('mouseup', () => {
			isDown = false;
			slider.classList.remove('active');
		});

		slider.addEventListener('mousemove', (e) => {
			if(!isDown) return;
			
			e.preventDefault();
			const x = e.pageX - slider.offsetLeft;		// normalize
			const walk = (x - startX) * 3;				// bigger steps

			slider.scrollLeft = scrollLeft - walk;
		});
	</script>

</body>

</html>