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Resolving the External PaperScript File Not Loading Issue in HTML

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Описание к видео Resolving the External PaperScript File Not Loading Issue in HTML

Learn how to fix the issue of missing external PaperScript files in your HTML projects, including practical tips and solutions to avoid CORS errors.
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This video is based on the question https://stackoverflow.com/q/71809632/ asked by the user 'Jacob' ( https://stackoverflow.com/u/17653621/ ) and on the answer https://stackoverflow.com/a/71824599/ provided by the user 'sasensi' ( https://stackoverflow.com/u/7615922/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the External PaperScript File Not Loading in HTML

When working with Paper.js and trying to load external scripts in your HTML file, you might run into frustrating situations where your script fails to load. One common issue faced by developers is that the external PaperScript file simply does not load, often linked to CORS (Cross-Origin Resource Sharing) policies or the incorrect version of Paper.js being used. In this guide, we will walk through a specific example of this problem, identify its cause, and then outline a step-by-step solution.

The Scenario

Imagine you are trying to set up a basic test program using Paper.js to animate a canvas with an SVG file. You might have arranged your files as follows:

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

After setting up your HTML code, you eagerly open it in Google Chrome, only to discover that the browser is not loading your script.js file. The Chrome DevTools does not list the script, and instead, you encounter an error message related to CORS:

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

This indicates there is a fundamental issue in your setup. Let's take this apart and see how to correctly resolve it.

Understanding the Root Cause

The primary issue at hand is that you are using the wrong version of the Paper.js library. In your HTML code, you are currently loading the paper-core.js file:

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

The paper-core.js version of Paper.js does not support PaperScript, which is critical for your script to function correctly when you use the type="text/paperscript" attribute.

Steps to Fix the Issue

Here’s how to correct your setup and load your PaperScript file successfully:

1. Use the Correct Paper.js Version

Replace your library loading line in the HTML file from paper-core.js to paper-full.js. Here's how your <head> section should look:

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

2. Serve Your Files Locally

To avoid CORS issues, it’s essential to serve your HTML files using a local server rather than opening them directly through the file system. You can use tools like:

Live Server: A Visual Studio Code extension that serves your project over an HTTP server.

Python SimpleHTTPServer: If you have Python installed, you can run python -m http.server in your project directory to create a local server.

3. Verify the Script References

Ensure that all script paths are correct. If the script.js or paper-full.js is stored in a scripts folder, the references should accurately point to those locations as follows:

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

Conclusion

By following the aforementioned steps, you should be able to resolve the issue of the missing external PaperScript file in your HTML project. Always double-check that you are using the appropriate version of Paper.js that supports the features you intend to implement. Additionally, serving your project through a local server will eliminate CORS issues that straightforward file access cannot bypass. Happy coding!

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