Add Html5 Slot Machine To Web Page

26.11.2020
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This is the fourth part of the Slot machine game in HTML5 (previous parts 1, 2, and 3) and this time we modify the game to support HTML5 offline mode, also known as HTML5 Application Cache.

Try out offline supported version here.

Word of warning. HTML5 offline mode is powerful but very fragile feature. It’s tricky to get right, but once you get it to work the mobile user experience can be very native app like.

Automatically

Some problems you will encounter

  • Browser refresh logic is confusing. Especially the fact that browser does not use updated manifest and resources when they change but only after next reload. Fortunately Javascript workarounds exists.
  • Application cache file maintenance needs diligence. For example, browser will not reload any assets if this file is not modified.
  • Externally linked resources do not generally work offline. This makes CDN use difficult.
  • Web server has to use right MIME type and cache settings to reliably use application cache files. Most web servers don’t do this in default configuration.
  • No reliable way to detect if page was loaded in online or offline mode.
  • Chrome bypasses some restrictions (e.g. cross-domain issues) in the specification and what works in Chrome may not work anywhere else.
  • Each browser has slightly different meaning and heuristic for using offline mode. For example if browser can load some unrelated pages but can’t currently load your app page it may not show your page in offline mode and simply shows “Can not reach the server error”. This may happen especially if it knows from last load that manifest has been updated. Then at other times, it may load page few times in offline mode even when connectivity has returned.

Manifest file

Web page must use application cache manifest file to support offline mode. This manifest file is specified in html tag of the page.

The file has listing of all content that page needs. For detailed explanation of each section, refer to Beginners guide to HTML5 application cache

Web Fonts

Web fonts must be hosted locally if you want to use them offline. Note that some web fonts may have licensing restrictions for local hosting.

The webfont.css defines the font face and loads true type file.

The file Slackey.ttf is hosted locally in css directory.

Add Html5 Slot Machine To Web Page Google Chrome

Web Server Support

Web server must use correct MIME type for text/cache-manifest application cache manifest. For example, in NGINX web server edit the mime.types and add following file type to MIME type mapping.

Browsers should check manifest every time page is loaded online, but it may not do this often enough if cache control is too long. Therefore, set short cache lifetime for the manifest files by adding this inside server section of NGINX configuration file. This forces cache lifetime of 1 minute to all *.appcache files.

Html5

Verify with cURL that server response Content-Type has right MIME type and that the Expires and/or Cache-Control have correct 1 minute cache life time. If you get 404 error, make sure that site root configuration is set in http section.

Detecting online status

Currently only “reliable” method to do is to make Ajax request and check the response. There are some caveats

  • Request may fail for other reasons, and this does not mean browser is in offline mode
  • Offline status may change while user is in page, you may want to do repeat polling check.
  • User may be in public WiFi that redirects requests to login server. This can confuse your app that gets response but is not what was expected.

Slots game checks online status in parallel while game loads and only on startup. Slots game does not really need to know if it’s online or offline, but just writes the status on screen for debugging purposes.

Otherwise loading images, audio and other content should be fully transparent to your app. Think twice before doing separate logic for online and offline as things will get difficult. Best advice I can give is to that you write code for online use with proper handling for Ajax errors. In this way when app loads in online mode but loses network later in session (e.g. when user goes in subway tunnel), the experience does not break completely.

Testing

This is the part where things get interesting, offline is tricky to test because of caching and browser reload logic. See detailed lamentation about subject here in Dive into HTML5.

These are the best practices I’ve come up with. First, set browser manually to offline mode to try things out. e.g. in Firefox this is enabled from File->Work Offline.

Second, if you develop the game from local server, do not use http://localhost as host, but use real domain name that resolves to localhost. In this example I’ve used http://hexxie.com that supports wildcard subdomain. Any subdomain resolves to address 127.0.0.1.

In this way you can always start from scratch the offline debugging simply by changing subdomain name. For example I just used slotsoff1.hexxie.com, slotsoff2.hexxie.com, … etc.:

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Note that at least Firefox asks each time if you allow offline content.

Before each deploy, remember to increment the version comment in manifest file, so web server notices that the file has changed and browser will refresh it on next load. Server does not look inside the manifest file, so it does not matter how you change the file, as long as it’s changed.

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Good Luck!

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Code is available in Github.