Changebar is a GitHub-powered changelog notifications widget for the web. Easily tell your users what's new, fetched directly from GitHub by Staticaly CDN.

Add Changebar to your project with NPM:

npm install changebar

Import it to your project:

import Changebar from "changebar";

Initialize it with your button (which, on click, will open Changebar), GitHub repo and file with your changelog (respect Semantic Versioning for best results, see Keep a Changelog):

const notifications = new Changebar({
  element: "button#notifs",
  repo: "AnandChowdhary/changebar",
  file: "CHANGELOG.md"
});

Then, the magic happens:

• Changebar will now use the GitHub API and find the most recent commit hash
• This hash is used to get the most recent version of your Markdown file with the changelog
• Staticaly CDN will serve the file from your most recent commit
• The total number of "notifications" is the number of subheadings in your semantic changelog
• Changebar will add the number of unread notifications to your button:

• When a user clicks on the button, Changebar will show a beautiful notifications interface with your changelog, rendering Markdown and applying CSS rules
• Using local storage, Changebar will remember how many notifications a user has already seen

You can use the following options in the constructor:

new Changebar({
  element: "#notifs", // Button to add notifications to
  repo: "username/repository", // GitHub username/repo format
  file: "CHANGELOG.md", // Name of the file to look at
  heading: "h2", // Selector for headings in rendered HTML (optional)
  hide: "h1" // Hide these elements the rendered HTML (optional)
})

Changebar adds the changebar-is-fetching, changebar-has-error, and changebar-completed classes to your button to keep track of the Fetch requests.

It also adds the data-unread-count attribute with the number of unread notifications and the changebar-has-unread class if there are unread notifications.

You can use the following methods for programatical access:

For example, you can open Changebar like this:

changebar.open();

Start development server with HMR and prettier:

yarn start

Build a production version:

yarn build

Changebar doesn't ship with any polyfills, just ES6 transpiled to ES5. You might want to add polyfills for the following in your build process, based on how backwards-compatible you want to be:

• Fetch API (no IE, Chrome 42+, Firefox 40+)
• Promise (No IE, Chrome 33+, Firefox 29+)
• Array.prototype.includes() (No IE, Chrome 47+, Firefox 43+)
• Element.classList (IE 10+, Chrome 8+, Firefox 3.6+)
• ParentNode.querySelector() (IE 8+, Chrome 4+, Firefox 3.5+)

• Make it work
• Tests
• Better API with events
• Changelog with GitHub releases

MIT