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Troubleshooting the 'Uncaught ReferenceError: ReactDOM is Not Defined' in CodePen
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Summary: Learn how to resolve the "Uncaught ReferenceError: ReactDOM is not defined" error in CodePen when working with React applications.
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Troubleshooting the "Uncaught ReferenceError: ReactDOM is Not Defined" in CodePen
If you've been working with React applications in CodePen, you might have encountered the following error: Uncaught ReferenceError: ReactDOM is not defined. This common error can be a showstopper, but fortunately, resolving it is straightforward. In this guide, we'll explore the reasons behind this error and walk you through the steps to fix it.
What Causes the Error?
The error Uncaught ReferenceError: ReactDOM is not defined signifies that the JavaScript context in which your code is running does not recognize the ReactDOM object. This is typically because the ReactDOM library hasn't been properly linked or imported in your project.
In CodePen, this often happens because the libraries needed for React and ReactDOM are not included by default.
How to Fix the Error in CodePen
Here are several steps to resolve this issue:
Add External Scripts
First, verify that the React and ReactDOM libraries are correctly added to your project. Here's how to do it:
Open your CodePen project.
Click on the gear icon for JavaScript settings (on the top right of the JavaScript pane).
In the "Add External Scripts/Pens" section, add the following URLs:
[[See Video to Reveal this Text or Code Snippet]]
Save your settings.
By adding these URLs, CodePen will load the React and ReactDOM libraries, making them available for your project.
Check Your Code
Ensure that your JavaScript code refers to ReactDOM correctly:
[[See Video to Reveal this Text or Code Snippet]]
Note that when using CodePen, the import statements are typically not needed if you have included the external scripts correctly. Instead, you can directly use ReactDOM.render:
[[See Video to Reveal this Text or Code Snippet]]
Use the Right Version
Sometimes, version mismatches might cause issues. Make sure that the version of React used matches with ReactDOM you've linked in external scripts.
Verify HTML
Ensure that your HTML file has a root element where React can mount your components:
[[See Video to Reveal this Text or Code Snippet]]
Place this in your HTML settings under the <body> section.
Conclusion
The Uncaught ReferenceError: ReactDOM is not defined error can be frustrating, but it's usually a quick fix if you know where to look. By ensuring that dependencies are correctly loaded and used in CodePen, you can get your React project up and running smoothly.
Happy coding!
---
Summary: Learn how to resolve the "Uncaught ReferenceError: ReactDOM is not defined" error in CodePen when working with React applications.
---
Troubleshooting the "Uncaught ReferenceError: ReactDOM is Not Defined" in CodePen
If you've been working with React applications in CodePen, you might have encountered the following error: Uncaught ReferenceError: ReactDOM is not defined. This common error can be a showstopper, but fortunately, resolving it is straightforward. In this guide, we'll explore the reasons behind this error and walk you through the steps to fix it.
What Causes the Error?
The error Uncaught ReferenceError: ReactDOM is not defined signifies that the JavaScript context in which your code is running does not recognize the ReactDOM object. This is typically because the ReactDOM library hasn't been properly linked or imported in your project.
In CodePen, this often happens because the libraries needed for React and ReactDOM are not included by default.
How to Fix the Error in CodePen
Here are several steps to resolve this issue:
Add External Scripts
First, verify that the React and ReactDOM libraries are correctly added to your project. Here's how to do it:
Open your CodePen project.
Click on the gear icon for JavaScript settings (on the top right of the JavaScript pane).
In the "Add External Scripts/Pens" section, add the following URLs:
[[See Video to Reveal this Text or Code Snippet]]
Save your settings.
By adding these URLs, CodePen will load the React and ReactDOM libraries, making them available for your project.
Check Your Code
Ensure that your JavaScript code refers to ReactDOM correctly:
[[See Video to Reveal this Text or Code Snippet]]
Note that when using CodePen, the import statements are typically not needed if you have included the external scripts correctly. Instead, you can directly use ReactDOM.render:
[[See Video to Reveal this Text or Code Snippet]]
Use the Right Version
Sometimes, version mismatches might cause issues. Make sure that the version of React used matches with ReactDOM you've linked in external scripts.
Verify HTML
Ensure that your HTML file has a root element where React can mount your components:
[[See Video to Reveal this Text or Code Snippet]]
Place this in your HTML settings under the <body> section.
Conclusion
The Uncaught ReferenceError: ReactDOM is not defined error can be frustrating, but it's usually a quick fix if you know where to look. By ensuring that dependencies are correctly loaded and used in CodePen, you can get your React project up and running smoothly.
Happy coding!
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![[SOLVED] Reference Error:](https://i.ytimg.com/vi/GAlh9LSdFrg/hqdefault.jpg)
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