It is essential for creating reliable and bug-free web applications to comprehend the underlying cause of this error and learn effective approaches to resolve it.
For that reason, this article aims to delve into the reasons behind the “$ is not defined” error and offer practical solutions to overcome it.
What is Uncaught Referenceerror: $ is not defined
However, in order to use these libraries, you need to ensure that they are properly loaded and available in your code.
Common cases referenceerror: $ is not defined occur
Here are the common cases why this error occurs:
📌 The path to your jQuery.js file is incorrect or unavailable, resulting in an Error 404 indicating that the file cannot be found.
To resolve the issue, you should fix the path to the jQuery.js file in your project.
If your project is a public website, it is recommended to use the Google hosted jQuery file.
This ensures that the file is readily available and accessible for your website visitors.
📌 jQuery plugin is included before jQuery file.
<script src="/path-to/jquery.plugin.js"></script> <script src="/path-to/jquery.min.js"></script>
Ensure that you include the jQuery.js file before any jQuery plugin files in your code.
<script src="/path-to/jquery.min.js"></script> <script src="/path-to/jquery.plugin.js"></script>
📌 You are including jQuery file without the protocol in the URL and accessing the page from your local file system.
Temporarily add HTTP protocol (
http:// instead of
//) in the URL while you are developing.
📌 jQuery file is included from the web, but you don’t have an internet connection. It is a silly mistake, but you would be surprised how ofter it happens.
Include local jquery.js file copy or connect to the internet
How to fix uncaught referenceerror: $ is not defined
So here are the recommended fix you can try in fixing the error.
- Ensure jQuery is included
If you’re using the “$” symbol as a shorthand for jQuery, make sure you have included the jQuery library before using it
You can do this by adding the following script tag in the section of your HTML file:
This will load the jQuery library from a CDN (Content Delivery Network). Adjust the version number if needed.
- Check script loading order
Verify that the script tag referencing jQuery is placed before the script where you’re using the “$” symbol.
The jQuery library needs to be loaded before you can use it.
- Use a different symbol:
If you suspect a conflict with other libraries or frameworks, you can try using a different symbol instead of “$” for jQuery.
You can achieve this by utilizing the jQuery.noConflict() method.
- Check for conflicts:
In such cases, you can use an IIFE (Immediately Invoked Function Expression) to create a local scope and pass the jQuery object as a parameter.
This way, you can use a different symbol within your code.
- Verify file paths and dependencies:
Double-check that the paths to the jQuery library and other dependencies are correct.
Ensure that the file names and paths are accurate, and the required scripts are properly included.
Anyway, here are other fixed errors you can refer to when you might encounter them.
Remember to correctly include the jQuery library, manage script loading order, resolve conflicts, and verify variable and function references.
We hope this guide has assisted you in resolving the error effectively.
Until next time! 😊