Solve - $(...).tabs is not a function Error in jQuery


Borislav Hadzhiev

Tue Oct 19 20212 min read


Photo by Nine Koepfer

Solve - $(...).tabs is not a function #

The "$(...).tabs is not a function" jQuery error occurs for multiple reasons:

  1. Forgetting to include the jQuery UI library.
  2. Loading the jQuery UI library before the jQuery library.
  3. Loading the jQuery library twice.
  4. Specifying an incorrect path to the jQuery files.

jquery tabs is not a function error

To solve the "$(...).tabs is not a function" jQuery error, make sure to load the jQuery library before loading the jQuery UI library. The libraries have to be loaded only once on the page, otherwise the error is thrown.

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <!-- ✅ Load CSS file for jQuery ui --> <link href="" rel="stylesheet" /> </head> <body> <div id="tabs"> <ul> <li><a href="#tabs-1">Nunc tincidunt</a></li> <li><a href="#tabs-2">Proin dolor</a></li> <li><a href="#tabs-3">Aenean lacinia</a></li> </ul> <div id="tabs-1"> <p>First tab</p> </div> <div id="tabs-2"> <p>Second tab</p> </div> <div id="tabs-3"> <p>Third tab</p> </div> </div> <!-- ✅ load jQuery ✅ --> <script src="" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous" ></script> <!-- ✅ load jQuery UI ✅ --> <script src="" integrity="sha512-uto9mlQzrs59VwILcLiRYeLKPPbS/bT71da/OEBYEwcdNUk8jYIy+D176RYoop1Da+f9mvkYrmj5MCLZWEtQuA==" crossorigin="anonymous" referrerpolicy="no-referrer" ></script> <!-- ✅ load your JS file ✅ --> <script src="index.js"></script> </body> </html>

The order we loaded the scripts in is very important. The order is the following:

  1. Load the jQuery UI css file.
  2. Load the jQuery library.
  3. Load the jQuery UI library.
  4. Run your JS file (index.js in the example).

Here's the code for the index.js file.

$(document).ready(function () { $('#tabs').tabs(); });

In our index.js file, we wait for the DOM to be ready and initialize the tab functionality.

If you open your browser, you'll see the tab component.

jquery tabs

If you're still getting the error, make sure you're loading the jQuery UI library after the jQuery library.

Check that you're not loading the jQuery library twice. Loading the library a second time re-runs the initialization process and causes the error.

When loading the libraries from files on your local files system, make sure that the paths you specify are correct and point to the right files.

Specifying an incorrect path to the jQuery or jQuery UI scripts is equivalent to not loading the scripts at all.

You can check if the specified paths are correct by opening the console in your browser and checking if you have any 404 errors related to loading the jQuery or jQuery UI libraries.
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