Smooth Back To Top Button With Scroll Progress Indicator

A jQuery/CSS/SVG based smooth back to top button with a circular progress bar which indicates the current reading progress when scrolling down/up the webpage.

How to use it:

1. Create the HTML for the back to top button & circular reading progress indicator.

<div class="progress-wrap">
  <svg class="progress-circle svg-content" width="100%" height="100%" viewBox="-1 -1 102 102">
  <path d="M50,1 a49,49 0 0,1 0,98 a49,49 0 0,1 0,-98" />
  </svg>
</div>

2. The required CSS/CSS3 styles for the progress bar.

.progress-wrap {
  position: fixed;
  right: 50px;
  bottom: 50px;
  height: 46px;
  width: 46px;
  cursor: pointer;
  display: block;
  border-radius: 50px;
  box-shadow: inset  0 0 0 2px rgba(255,255,255,0.2);
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px);
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
}

.progress-wrap.active-progress {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.progress-wrap::after {
  position: absolute;
  content: '↑';
  text-align: center;
  line-height: 46px;
  font-size: 24px;
  color: #ecedf3;
  left: 0;
  top: 0;
  height: 46px;
  width: 46px;
  cursor: pointer;
  display: block;
  z-index: 1;
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
}

.progress-wrap:hover::after {
  opacity: 0;
}

.progress-wrap::before {
  position: absolute;
  content: '↑';
  text-align: center;
  line-height: 46px;
  font-size: 24px;
  opacity: 0;
  background-image: linear-gradient(298deg, #da2c4d, #f8ab37);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  left: 0;
  top: 0;
  height: 46px;
  width: 46px;
  cursor: pointer;
  display: block;
  z-index: 2;
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
}

.progress-wrap:hover::before {
  opacity: 1;
}

.progress-wrap svg path { 
  fill: none; 
}

.progress-wrap svg.progress-circle path {
  stroke: #ecedf3;
  stroke-width: 4;
  box-sizing:border-box;
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
}

3. Include the necessary JavaScript library on the page.

<script src="https://code.jquery.com/jquery-3.4.0.min.js" integrity="sha384-JUMjoW8OzDJw4oFpWIB2Bu/c6768ObEthBMVSiIx4ruBIEdyNSUQAjJNFqT5pnJ6" crossorigin="anonymous"></script>

4. The JavaScript (jQuery script) to activate the back to top button & circular reading progress indicator.

var progressPath = document.querySelector('.progress-wrap path');
var pathLength = progressPath.getTotalLength();

progressPath.style.transition = progressPath.style.WebkitTransition = 'none';
progressPath.style.strokeDasharray = pathLength + ' ' + pathLength;
progressPath.style.strokeDashoffset = pathLength;
progressPath.getBoundingClientRect();
progressPath.style.transition = progressPath.style.WebkitTransition = 'stroke-dashoffset 10ms linear';

var updateProgress = function () {
  var scroll = $(window).scrollTop();
  var height = $(document).height() - $(window).height();
  var progress = pathLength - scroll * pathLength / height;
  progressPath.style.strokeDashoffset = progress;
};

updateProgress();

$(window).scroll(updateProgress);

var offset = 50;
var duration = 550;

jQuery(window).on('scroll', function () {
  if (jQuery(this).scrollTop() > offset) {
    jQuery('.progress-wrap').addClass('active-progress');
  } else {
    jQuery('.progress-wrap').removeClass('active-progress');
  }
});

jQuery('.progress-wrap').on('click', function (event) {
  event.preventDefault();
  jQuery('html, body').animate({ scrollTop: 0 }, duration);
  return false;
});

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This awesome jQuery plugin is developed by Ivan Grozdic. For more Advanced Usages, please check the demo page or visit the official website.