Goldman Sachs has an interesting webpage located here. One feature that caught my eye is the header that appears as you scroll down, with squares changing from white to blue based on the section of the page. I'm curious about how they achieved this effect without it being obvious in the code. How did they make the scrollbar seemingly appear out of nowhere and control the color change of the squares?
One common approach is to track the scrollbar position using JavaScript, with the help of the jQuery library in this demonstration.
Here's a snippet of code for illustrative purposes:
$(window).scroll(function (event) {
var numOfButtons = 4;
var scroll = $(window).scrollTop();
var heightContainer = $(".container").height();
if(scroll > heightContainer / numOfButtons){
$(".header .button:nth-child(2)").addClass('act');
}else{
$(".header .button:nth-child(2)").removeClass('act');
}
if(scroll > (heightContainer / numOfButtons) * 2){
$(".header .button:nth-child(3)").addClass('act');
}else{
$(".header .button:nth-child(3)").removeClass('act');
}
if(scroll > (heightContainer / numOfButtons) * 3){
$(".header .button:nth-child(4)").addClass('act');
}else{
$(".header .button:nth-child(4)").removeClass('act');
}
});.header{
height:50px;
background-color:blue;
color:white;
position:fixed;
top:0;
left:0;
width:100%;
}
.button{
display:inline-block;
width:10px;
height:10px;
background-color:white;
border-radius:20px;
}
.button.act{
background-color:red;
}
h1{
margin-top:60px;
}
.container{
height:4000px;
background:url("http://www.planwallpaper.com/static/images/518164-backgrounds.jpg");
}<html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>
<h1>Scroll demo</h1>
<div class="header">
<div class="button act"></div>
<div class="button"></div>
<div class="button"></div>
<div class="button"></div>
</div>
<div class="container"><div id="mydiv"></div>
</div>
</body>
</html>To achieve the desired effect, consider using jquery waypoints as a solution:
One approach is to add a class with display:block to the header when a specific section reaches the top of the viewport, making it visible. You can then use addClass and removeClass along with CSS transitions for the squares.
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