Fixed Header Transformation When Page is Scrolled

css, html, javascript, jquery

Solution

The header stays on top with the css `position:fixed` .. either you can set the header css -- `position:fixed` right from the start or change it to `position:fixed` once he starts scrolling the page.. and update the header to the contents you want to keep as he scrolls..

// css
.container {
  height: 2000px;
  width: 100%;
  background-color: yellow;
}

.header {
  text-align: center;
  background-color: red;
  height: 100px;
  min-height: 50px;
  width: 100%;
}

// js

window.onscroll= function () {
  var top = window.pageXOffset ? window.pageXOffset : document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;
  var header = document.getElementById("header");
  if (top > 50){
    header.style.position = "fixed";
    header.style.height = "50px";
  } else {
    header.style.position = "relative";
    header.style.height = "100px";
  }
}

//html
<div class="container">
  <div id="header" class="header">
    Hello World
  </div>
</div>

Demo here

Problem

Original source