Скачать или смотреть Troubleshooting: JS Loaded Through Webpack but Not Executing in Rails 6

Discover how to resolve the common issue of JavaScript not executing in your Rails 6 application after being loaded through Webpack.
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This video is based on the question https://stackoverflow.com/q/63511774/ asked by the user 'amoks' ( https://stackoverflow.com/u/2408934/ ) and on the answer https://stackoverflow.com/a/63525161/ provided by the user 'amoks' ( https://stackoverflow.com/u/2408934/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting: JS Loaded Through Webpack but Not Executing in Rails 6

If you're working with Rails 6 and Webpack, you may find yourself facing a frustrating problem: your custom JavaScript loads successfully, but it doesn't execute as expected. This can be particularly perplexing, especially when you're confident that the code is loaded correctly. Let's dive into the common causes of this issue and how to effectively resolve it.

The Problem

You've implemented some custom JavaScript to enhance the user experience on your Ruby on Rails application. Specifically, you’ve created a feature to toggle the visibility of a password field. You’ve added the JavaScript through Webpacker, but despite seeing it in the console, the code appears to be non-functional.

Common Causes

Many developers encounter similar issues. Here are some potential causes for this behavior:

Scoping Issues: The JavaScript might not be in the correct execution context.

Load Order: JavaScript files may not be loaded in the proper order, affecting execution.

File Structure: The placement of JavaScript files might not align with Rails and Webpack’s expectations.

The Solution

Fortunately, this problem can typically be resolved with a couple of straightforward changes. Here's how I managed to fix the issue:

Step 1: Organize JavaScript Files

Move Custom JavaScript:

I relocated my custom JavaScript code into a separate pack file located at app/javascript/packs/custom.js.

Update Imports:

Next, I updated app/javascript/packs/application.js to reference this new file path.

Step 2: Adjust Load Order

Load at the Bottom:

Following a suggestion I found online, I added the JavaScript to load at the bottom of the HTML body tag instead of the head. This ensures that the DOM elements are fully rendered before the script executes.

Implementation Example

Here’s how your files should look after implementing the changes:

app/javascript/packs/application.js

[[See Video to Reveal this Text or Code Snippet]]

New Custom File: app/javascript/packs/custom.js

[[See Video to Reveal this Text or Code Snippet]]

HTML Structure

Ensure your HTML includes your custom element like so:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By organizing your JavaScript files properly and ensuring they're loaded in the correct order, you can effectively resolve the issue of JavaScript not executing with Webpack in your Rails 6 application. While I tried each of the solutions independently without success, implementing both changes simultaneously did the trick.

I hope this guide helps anyone facing similar challenges in their projects!