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Progressive Web App
The mobile-friendly web edition comes with support for progressive web apps: The first time you visit the textbook site with a mobile device, the embedded JS in index.html tries to install a "web app" on the device. Here is how this is done, adapting the instructions here: https://blog.heroku.com/how-to-make-progressive-web-app
Located in rails/public/static/manifest.json. The manifest needs to be linked in the generated index.html. This is done in: rails/app/views/layouts/application.html.erg. Added there is the line:
<link rel="manifest" href="/static/manifest.json">
in HEADER.
Created file offline.html to be placed in root directory. This file is in folder rails/public for Ruby-on-Rails to find it.
Create a service worker script sw.js to be placed in root directory. This file is in folder rails/public for Ruby-on-Rails to find it.
The manifest needs to be run in the generated index.html. This is done in: rails/app/views/layouts/application.html.erg. Added there are the lines:
<script>
if (!navigator.serviceWorker.controller) {
navigator.serviceWorker.register("/sw.js").then(function(reg) {
console.log("Service worker has been registered for scope: " + reg.scope);
});
}
</script>
in BODY.
The folder rails/public/favicon has some Powerpoint sources. Design what you like and place the result in folder rails/public/<filename>.png. Make sure the name and resolution is as stated in the manifest.