Html – Progress bar when scroll

htmljqueryscroll

I wanted some help to make a progress bar while scrolling the page.

User will while clicking next , the bar will filling.

I was confused?

my cod. 

var sections = $('.panelSection');
console.log(sections);
var i = 0;
var scrolto = 0;

function next() {
    if (i == 0) {
        $('.prev-section').show();
    }
    
    if (i < sections.length -1) {
        i++;
        if (i == sections.length -1) {
            $('.next-section').hide();
        }
        
        $('html, body').animate({
            scrollTop: sections[i].offsetTop
        }, 500);
    } else {
        alert('end reached');
    }
}

function prev() {
    if (i == sections.length -1) {
        $('.next-section').show();
    }
    
    if (i > 0) {
        i--;
        if (i == 0) {
            $('.prev-section').hide();
        }
        
        $('html, body').animate({
            scrollTop: sections[i].offsetTop
        }, 500);
    }
}

$('html').keydown(function(e) {
    if (e.which == '38') {
        prev();
    }
    
    if (e.which == '40') {
        next();
    }
});

$('.next-section').click(function(e) {
    e.preventDefault();
    next();
});

$('.prev-section').click(function(e) {
    e.preventDefault();
    prev();
});         
section {
    height: 100vh;
    text-align: center; 
    font-size: 30pt
}    
 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<section class="panelSection" style="background-color:#ef0000;">
    ... section content here ...
</section>

<section class="panelSection" style="background-color:#c9d6e3;">
    ... 2nd section content here ...
</section>

<footer>
    <div class="navbar navbar-default navbar-fixed-bottom">
        <div class="container-fluid">
            <div class="navbar-collapse collapse" id="footer-body">
                <ul class="nav navbar-nav pull-left">


                </ul>

                <ul class="nav navbar-nav pull-right">

                    <a href="#" class="prev-section">up</a>
                    <a href="#" class="next-section">next</a>

                </ul>
            </div>

            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#footer-body">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>

                    <a href="#" class="next-section">next</a>


                </button>
            </div>

        </div>
    </div>
</footer>

I did not think anything like this on the internet if anyone can help I will thank a lot!

Best Answer

function updateProgress(num1, num2){
  var percent = Math.ceil( num1 / num2 * 100 ) + '%';
  document.getElementById('progress').style.width = percent;
}

window.addEventListener('scroll', function(){
  var top = window.scrollY;
  var height = document.body.getBoundingClientRect().height - window.innerHeight;
  updateProgress(top, height);
});
.placeholder{
  padding: 3em;
}
.progressContainer{
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: gray;
}
.progress{
  height: 4px;
  background: red;
  width: 0;
  transition: width 0.5s;
}
<!DOCTYPE html>
<html>

<head>
	<meta charset="utf-8">
	<title></title>
</head>

<body>
	<div class="placeholder">
		some padding...
	</div>
	<div class="placeholder">
		some padding...
	</div>
	<div class="placeholder">
		some padding...
	</div>
	<div class="placeholder">
		some padding...
	</div>
	<div class="placeholder">
		some padding...
	</div>
	<div class="placeholder">
		some padding...
	</div>
	<div class="placeholder">
		some padding...
	</div>
  <div class="progressContainer"><div id="progress" class="progress"></div></div>
</body>

</html>

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