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Add a reading progress bar to your HubSpot blog

⚠️ Note that this post hasn't been updated for at least a year and the information may be outdated, proceed with caution! (Last updated: April 18, 2022)

The code below can be used on your templates or pages to add a reading progress bar at the top of your page. 

Create your progress bar

The reading progress bar can be added to a template or custom module using the following HTML snippet: 

<div id="progress-wrapper" class="progress-wrapper">
  <div id="progress-bar" class="progress-bar"></div>

Style your progress bar

You can add the CSS below to your stylesheet or custom module to add styling to the progress bar: 

.progress-wrapper {
  width: 100%;
  height: 5px; /* Bar height */
  background-color: #f9f9f7 ; /* Bar background colour */
  position: -webkit-sticky;
  position: sticky;
  top: 0;
.progress-bar {
  width: 0;
  height: 5px; /* Bar height */
  background-color: #fc8c7a; /* Bar progress colour */

Get it working

Adding the following snippet to the JavaScript file or custom module JS section should result in a working progress bar:

/* Declare your variables: the progress bar and the post container */
const progressWrapper = document.getElementById("progress-wrapper"),
      progressBar = document.getElementById("progress-bar"),
      container = document.getElementById("container"),
      body = document.body;

/* Math stuff */
function setProgress() {
  let start = container.getBoundingClientRect().top,
      end = container.getBoundingClientRect().bottom,
      height = container.getBoundingClientRect().height;
  if (start > 0) {
    let width = 0; = width;
  } else {
    let width = Math.abs(start) / height * 100 + "%"; = width;

/* Trigger the function on scroll */
window.addEventListener('scroll', setProgress);

The "container" highlighted in bold above is the ID for the container where you'd like the progress bar to start and end. For example, add a DIV in your Blog Content module around the post and give it an ID "post-wrapper", then swap that out above.


Check it out on Codepen:

See the Pen Reading Progress Bar Within Container by Stephanie O'Gay Garcia (@stephanieogaygarcia) on CodePen.

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