Add a dark-mode theme toggle with a Bootstrap Custom Switch.

• Uses local storage to save preference
• Only 383 Bytes minified and gzipped!

Several quick start options are available:

• Download the latest release
• Clone the repo git clone https://github.com/coliff/dark-mode-switch.git
• Install with npm npm install dark-mode-switch
• Install with yarn yarn add dark-mode-switch

1. Add your custom switch for the Dark Mode toggle followed by the dark-mode-switch.min.js script:

Bootstrap 4.x

<div class="custom-control custom-switch">
  <input type="checkbox" class="custom-control-input" id="darkSwitch" />
  <label class="custom-control-label" for="darkSwitch">Dark Mode</label>
</div>
<script src="dark-mode-switch.min.js"></script>

Bootstrap 5.x

<div class="form-check form-switch">
  <input type="checkbox" class="form-check-input" id="darkSwitch" />
  <label class="custom-control-label" for="darkSwitch">Dark Mode</label>
</div>
<script src="dark-mode-switch.min.js"></script>

2. Edit the dark-mode.css to suit your site - the one included here is a basic example.

Turning dark mode on will add data-theme="dark" to the body tag. You can use CSS to target the elements on the page like so:

[data-theme="dark"] {
  background-color: #111 !important;
  color: #eee;
}

Bootstrap 5 Demo page

Works well with all the browsers supported by Bootstrap 4 and Bootstrap 5

• You need DOM Storage API in order to make this work with WebView.
• Inside OnCreate under WebView paste this line.

WebSettings.setDomStorageEnabled(true)

Created thanks to the excellent dark-theme and local storage tutorials over at codyhouse.co.