Issues are being faced with the execution of JavaScript on Heroku when using Rails 3.1

After upgrading a Rails 3.0 app to 3.1 on Heroku running on the cedar stack, everything seemed fine except for one major issue - the app's JavaScript wouldn't run. Despite the application.js file being compiled and accessible at myapp.com/assets/application.js, it simply refused to execute.

Surprisingly, when testing the app locally, the JavaScript worked perfectly fine. This led me to believe there must be a simple configuration error that I am overlooking. Below is a snippet of my production.rb file:

FloridaBirdTrail::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb

  # Code is not reloaded between requests
  config.cache_classes = true

  # Full error reports are disabled and caching is turned on
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  # Disable Rails's static asset server (Apache or nginx will already do this)
  config.serve_static_assets = true

  # Compress JavaScripts and CSS
  config.assets.compress = true

  # Send deprecation notices to registered listeners
  config.active_support.deprecation = :notify
end

Edit:

By replacing the contents of production.rb with those of development.rb, some of the JavaScript started working (though gmap3 seems to be having issues). Now, the question arises - which specific setting is causing this behavior?

Answer №1

Access your application.rb file and double-check that your Bundler require statement is formatted as shown below:

Bundler.require *Rails.groups(:assets)

The default format may appear like this:

# If you precompile assets before deployment, use this code
Bundler.require *Rails.groups(:assets => %w(development test))
# To have assets lazily compiled in production, use this code
# Bundler.require(:default, :assets, Rails.env)

Answer №2

Personally, I found success by manually precompiling.

Try running bundle exec rake assets:precompile
before deploying to Heroku.

Answer №4

When troubleshooting Javascript issues, I encountered a problem on the server-side (on Heroku) that disappeared when implementing the following changes: * Transferring all Javascript code into a separate file rather than keeping it in application.js * Eliminating require_tree from application.js and specifically referencing each necessary Javascript file by name * Deleting bootstrap.js from my app/assets/javascript folder

It seems like the compilation process may be causing some interference with the functionality.

Answer №5

It is crucial to pre-compile your assets locally before deploying to Heroku, as recommended in a previous response. Make sure to verify if there are any JavaScript execution restrictions on your system. To do this, access the console on your Heroku app and look for any error messages. If you encounter errors related to blocked JavaScripts, that may be the root cause of the problem. I faced a similar issue where I couldn't resolve it due to lack of admin privileges.

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