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Learn how to prevent Bootstrap JS from being overwritten in your Rails application using Webpack, ensuring your JavaScript functions run smoothly.
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This video is based on the question https://stackoverflow.com/q/64389055/ asked by the user 'SLG' ( https://stackoverflow.com/u/14462297/ ) and on the answer https://stackoverflow.com/a/64513248/ provided by the user 'SLG' ( https://stackoverflow.com/u/14462297/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing Bootstrap JS Overwrites with Webpack: A Step-by-Step Guide

When working on a web application using Rails, Bootstrap, and Webpack, encountering issues with Bootstrap's JavaScript functionality not working can be frustrating. A common problem developers face is that certain jQuery events, such as shown.bs.modal, do not fire as expected. This often occurs when jQuery is included multiple times, leading to unresponsive Bootstrap features. In this guide, we will explore how to address this issue effectively.

Recognizing the Problem

If you've implemented custom JavaScript files for different pages in your Rails application and found that Bootstrap's jQuery events are not functioning properly, you're not alone. The core of the issue lies within how Webpack is configured to handle jQuery. When jQuery gets loaded multiple times, it can overwrite Bootstrap's event listeners, leading to unexpected behaviors.

Common Symptoms

Bootstrap styles are applied correctly, and modals appear as intended.

Console logs, such as 'document loaded' and 'a button was pressed,' show up as expected.

However, events like shown.bs.modal are not triggering, indicating a problem with Bootstrap's interaction with jQuery.

Understanding the Setup

To diagnose this issue, let's take a look at the configuration typically employed in a Rails application using Webpack, jQuery, and Bootstrap. Here's what a simplified setup might look like:

Dependencies

Rails Version: 6.0.3.4

Bootstrap Version: 4.3.1

jQuery Version: 3.5.1

Example webpack/environment.js Configuration

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

Example application.js

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

Example custom.js

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

The Solution

After identifying that jQuery is being included multiple times, we can fix this by modifying our setup to ensure jQuery is only loaded once, ideally within the application.js file.

Steps to Resolve the Issue

Modify config/webpack/environment.js: Remove jQuery definitions that allow it to be imported in multiple files. This way, jQuery is handled centrally.

Update application.js: Import jQuery explicitly and assign it to the window object, making it globally accessible. This ensures that your Bootstrap components can interact seamlessly with it:

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

This update centralizes the inclusion of jQuery within the primary JavaScript pack (application.js), preventing other JavaScript files, like custom.js, from unnecessarily re-importing it.

Conclusion

By following these steps, you can effectively eliminate the conflict causing Bootstrap JavaScript functions to misbehave. This ensures that your JavaScript works smoothly across different pages of your application without duplicating libraries that can lead to issues.

Final Checklist

Ensure jQuery is only included in the application.js file.

Test with various Bootstrap components to confirm expected behavior.

Monitor console logs for any potential new issues after changes.

With this fix, you should find that all Bootstrap jQuery events, including shown.bs.modal, work as intended, creating a seamless user experience in your application. Happy coding!