Make Up button at start appearing in certain part

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Make Up button at start appearing in certain part

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#1 by (1 votes)

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I would like to create a button to upload to the beginning, but I would not like it to always be visible, only when the page arrives in a certain part

html css

asked by anonymous 19.09.2018 / 20:40

1 answer

Pointers and data type hidden in C How to display a Menu by clicking the BottomNavigationView item

score 1 · Accepted Answer

Here is an option made with jQuery

When btn is $(this).scrollTop() > 160) it appears, when it is less than 160 from the top it hides. I left the comments in the code.

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<title>Page Title</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	
<style>
	html, body {
		width: 100%;
		height: 100%;
		margin: 0;
		padding: 0;
	}
	.go-top {
		position: fixed;
		bottom: 4.5rem;
		right: 3rem;
		display: none;
		border: 60px solid transparent;
		border-bottom-color: black;
		z-index: 1100;
		cursor: pointer;
	}
</style>

</head>
<body>

	<div style="height:1500px; width:100px"></div>
			
	<div class="go-top"></div>
	
	<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
	<script>
		$(document).ready(function() {
			// esconde e mostra o btn
			$(window).scroll(function() {
			if ($(this).scrollTop() > 160) { // distancia que tem que rolar antes de aparecer
				$('.go-top').fadeIn(250);
			} else {
				$('.go-top').fadeOut(250);
			}
			});
			// manda pro topo
			$('.go-top').click(function(event) {
			event.preventDefault();
			$('html, body').animate({scrollTop: 0}, 1200);
			});

		});
	</script>

</body>
</html>