FloatSidebar.js

A lightweight (2kb gzipped), zero-dependency javascript library for making a sidebar float.

Demo

FloatSidebar.js is a vanilla javascript library that can be used to make a sidebar float, so it would automatically stick to the top or bottom of the viewport depending on the scroll direction as long as the beginning or end of the content is not reached.

The library supports two strategies which are enabled depending on the sidebar's height:

1. When the sidebar's height > the viewport's height, the sidebar sticks to the viewport bottom when scrolling down, and to the viewport top when scrolling up (see the left sidebar on the video).
2. When the sidebar's height < the viewport's height, the sidebar sticks to the viewport top (see the right sidebar on the video).

https://user-images.githubusercontent.com/5039436/164990489-0424b5ab-c231-4f5c-bc1b-fc3f9594e347.mov

Install

npm install float-sidebar --save

or

yarn add float-sidebar

or

<script src="./path/to/float-sidebar.min.js"></script>

Usage

<div class="wrapper">
  <div class="content">
    <!-- Content -->
  </div>

  <div class="sidebar">
    <div class="sidebar__inner">
      <!-- Sidebar content -->
    </div>
  </div>
</div>

.wrapper {
  display: flex;
  /* Required in case of using an infinite scroll */
  align-items: flex-start;
}

.sidebar {
  /* Required */
  position: relative;

  /* Required. The sidebar element should have a fixed width */
  width: 220px;
}

import FloatSidebar from 'float-sidebar';

const sidebar  = document.querySelector('.sidebar');
const relative = document.querySelector('.content');

const floatSidebar = FloatSidebar({
  sidebar,
  relative,
  topSpacing: 20,
  bottomSpacing: 20
});

// ...

floatSidebar.forceUpdate();

// ...

floatSidebar.destroy();

Options

Instance API

Similar libraries

• https://github.com/abouolia/sticky-sidebar

License

FloatSidebar.js is released under the MIT license.

Author Sergey Vinogradov