Troubleshooting async/await Workflows: Loading and Injecting External Scripts in JavaScript

Discover how to solve the problem of loading external scripts with async/await in JavaScript, ensuring smooth execution and avoiding undefined errors.
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Troubleshooting async/await Workflows: Loading and Injecting External Scripts in JavaScript

In this guide, we will unravel the specifics of this problem, provide an in-depth explanation of potential pitfalls, and offer a clear solution to ensure smooth loading of external scripts.

Understanding the Problem

Key Observations:

The script that contains the greCaptcha API was not always fully loaded before the execution call was made.

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

The refresh() function was being called within an event handler, suggesting timing issues with the script's loading.

Solution Breakdown

Step 1: Creating a Global Callback

Step 2: Updating the Load Method

Here’s how you can modify the load() method of your RecaptchaController class:

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

Important Updates Explained:

Global Callback: By assigning a function to window._recaptchaOnLoad, you ensure that it gets called once the reCAPTCHA API has loaded. This callback will resolve the promise, allowing the refresh() function to execute correctly.

Remove Load Event: Since we are now handling the successful load through a callback, the previous load event listener can be removed.

Cleanup: Optionally, once the script has executed, deleting the global callback helps to prevent memory leaks and keeps the global namespace clean.

Conclusion

As you work with external libraries and asynchronous loading, remember that timing is crucial. Implementing this pattern will enhance the reliability of your code, especially when dealing with third-party resources like reCAPTCHA. Happy coding!