w3collective/js-scroll-to-top-button.html

## js-scroll-to-top-button.html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>How to create a scroll to top button with JavaScript</title>
  <style>
    html,
    body {
      padding: 0;
      margin: 0;
    }
    header {
      background-color: #073b4c;
      height: 10vh;
    }
    section {
      height: 90vh;
    }
    section.one {
      background-color: #118ab2;
    }
    section.two {
      background-color: #06d6a0;
    }
    section.three {
      background-color: #ffd166;
    }
    #scroll-btn {
      opacity: 0;
      width: 40px;
      height: 40px;
      color: #fff;
      background-color: #ef476f;
      position: fixed;
      bottom: 10%;
      right: 10%;
      border: 2px solid #fff;
      border-radius: 50%;
      font: bold 20px monospace;
      transition: opacity 0.5s, transform 0.5s;
    }
    #scroll-btn.show {
      opacity: 1;
      transition: opacity 1s, transform 1s;
    }
  </style>
</head>

<body>
  <header></header>
  <section class="one"></section>
  <section class="two"></section>
  <section class="three"></section>
  <section class="one"></section>
  <section class="two"></section>
  <section class="three"></section>
  <script>
    const scrollTop = function () {
      // create HTML button element
      const scrollBtn = document.createElement("button");
      scrollBtn.innerHTML = "&uarr;";
      scrollBtn.setAttribute("id", "scroll-btn");
      document.body.appendChild(scrollBtn);
      // hide/show button based on scroll distance
      const scrollBtnDisplay = function () {
        window.scrollY > window.innerHeight
          ? scrollBtn.classList.add("show")
          : scrollBtn.classList.remove("show");
      };
      window.addEventListener("scroll", scrollBtnDisplay);
      // scroll to top when button clicked
      const scrollWindow = function () {
        if (window.scrollY != 0) {
          setTimeout(function () {
            window.scrollTo(0, window.scrollY - 50);
            scrollWindow();
          }, 10);
        }
      };
      scrollBtn.addEventListener("click", scrollWindow);
    };
    scrollTop();

  </script>
</body>

</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1" />
	<title>How to create a scroll to top button with JavaScript</title>
	<style>
	html,
	body {
	padding: 0;
	margin: 0;
	}
	header {
	background-color: #073b4c;
	height: 10vh;
	}
	section {
	height: 90vh;
	}
	section.one {
	background-color: #118ab2;
	}
	section.two {
	background-color: #06d6a0;
	}
	section.three {
	background-color: #ffd166;
	}
	#scroll-btn {
	opacity: 0;
	width: 40px;
	height: 40px;
	color: #fff;
	background-color: #ef476f;
	position: fixed;
	bottom: 10%;
	right: 10%;
	border: 2px solid #fff;
	border-radius: 50%;
	font: bold 20px monospace;
	transition: opacity 0.5s, transform 0.5s;
	}
	#scroll-btn.show {
	opacity: 1;
	transition: opacity 1s, transform 1s;
	}
	</style>
	</head>

	<body>
	<header></header>
	<section class="one"></section>
	<section class="two"></section>
	<section class="three"></section>
	<section class="one"></section>
	<section class="two"></section>
	<section class="three"></section>
	<script>
	const scrollTop = function () {
	// create HTML button element
	const scrollBtn = document.createElement("button");
	scrollBtn.innerHTML = "↑";
	scrollBtn.setAttribute("id", "scroll-btn");
	document.body.appendChild(scrollBtn);
	// hide/show button based on scroll distance
	const scrollBtnDisplay = function () {
	window.scrollY > window.innerHeight
	? scrollBtn.classList.add("show")
	: scrollBtn.classList.remove("show");
	};
	window.addEventListener("scroll", scrollBtnDisplay);
	// scroll to top when button clicked
	const scrollWindow = function () {
	if (window.scrollY != 0) {
	setTimeout(function () {
	window.scrollTo(0, window.scrollY - 50);
	scrollWindow();
	}, 10);
	}
	};
	scrollBtn.addEventListener("click", scrollWindow);
	};
	scrollTop();

	</script>
	</body>

	</html>