Jquery ошибка is not a function

WordPress fully supports JavaScript as well as the jQuery library. However, the way in which WordPress implements jQuery can lead to errors when you’re trying to execute functions. One of the most common issues is the “Uncaught TypeError: $ is not a function” error.

Troubleshooting this error is relatively simple if you understand what causes it. The “$” alias is at the core of the problem, and jQuery and WordPress offer several ways to circumvent it so you can run the functions you need.

In this article, we’ll explain what the “Uncaught TypeError: $ is not a function” error is and what causes it. Then, we’ll also show you how to troubleshoot it. Let’s get started!

What Is the “Uncaught TypeError: $ Is Not a Function” Error in WordPress?

The “Uncaught TypeError: $ is not a function” error is a common JavaScript error that occurs when the jQuery library is not loaded correctly or there’s a conflict with other scripts using the ‘$’ symbol.

In WordPress, this error has more to do with how the Content Management System (CMS) implements jQuery and less with loading problems.

jQuery is a popular JavaScript library. It’s widely used in WordPress themes and plugins for handling various dynamic elements, animations, and AJAX operations:

In jQuery, the “$” symbol is an alias for the jQuery object, which is the primary object you interact with when working with the library. It makes the code shorter, more readable, and easier to write.

While WordPress fully supports the jQuery library, the way in which it’s implemented can lead to errors… so learning how to quickly troubleshoot them is key 🔑Click to Tweet

The “Uncaught TypeError: $ is not a function” is somewhat difficult to troubleshoot because you won’t see a clear error message. Unlike other WordPress errors, this problem can be triggered by misconfigured elements on your site or even a 404 error page:

The most effective way to diagnose the problem is by taking a look at the developer console or by using WordPress debug logs.

What Are the Main Causes of the “Uncaught TypeError: $ Is Not a Function” Error?

The “Uncaught TypeError: $ is not a function” error has everything to do with jQuery. You’ll run into this problem when a function that includes the “$” symbol is executed while the website is being loaded.

Here are some potential causes behind the error:

1. The jQuery library is not properly loaded. If the jQuery library isn’t properly loaded or enqueued, the ‘$’ symbol won’t be recognized as a valid function and it will throw an error. This is typically not a problem in WordPress because the Content Management System (CMS) loads the library natively.
2. You’re using jQuery in noConflict mode. By default, WordPress runs jQuery in noConflict mode. That means it doesn’t recognize the “$” symbol as a function name. To use it, you’ll need to put a workaround in action.
3. Plugin or theme conflicts. Some plugins or themes may have improperly coded JavaScript that interferes with the proper functioning of jQuery or uses the ‘$’ symbol in a way that causes problems with other scripts.

To summarize, WordPress is not configured to recognize the “$” symbol. However, that doesn’t mean you can’t run jQuery code within the CMS. After all, the library is part of WordPress. What you’ll need to do is use a workaround to avoid problems with the “$” symbol.

How To Fix the “Uncaught TypeError: $ Is Not a Function” Error (2 Ways)

Before we get to work, it’s important to note that jQuery is already a part of WordPress. Some tutorials will instruct you to enqueue jQuery, but the library has been a part of the Content Management System (CMS) for a while.

WordPress also runs jQuery in “noConflict” mode out of the box. That means it releases the “$” symbol so that other libraries can use it. Instead of disabling “noConflict” mode, here’s how you should approach this problem.

1. Use “jQuery” Instead of “$”

If you run into problems while using the “$” symbol in functions, you can use “jQuery” instead. To give you an example, here’s what a basic jQuery function using “$” may look like:

$(function() {
  // Your code here will run once the DOM is ready
});

In this case, a quick fix would be to replace the “$” symbol with jQuery. The code would then look like this:

jQuery(function() {
  // This code will not trigger the error
});

Alternatively, you can “wrap” the code in an immediately invoked function expression that contains the jQuery symbol. The following example would not trigger the “Uncaught TypeError: $ is not a function” error because it uses the jQuery symbol as a wrapper:

jQuery(function ($) {
    // You can use $ inside the wrapper
    console.log($('.primary-menu'));
});

After making these changes to the code, you can use your browser’s developer console or the WordPress debug log to see if the error persists. If it does, you may need to map “jQuery” to another symbol to circumvent more errors.

2. Use a Custom Alias in jQuery

“$” is the default alias for the jQuery object. However, since WordPress runs jQuery in noConflict mode, you might need to map an alternative alias to avoid conflicts with other libraries.

This process is relatively simple, as you can map the alias to a new symbol with a single line of code:

vvar $j = jQuery;

That code replaces the default alias with “$j” but it can be anything else you want. Some developers prefer this approach versus having to type the full “jQuery” object, as we showed in the previous method.

If you’re not sure where to add this code, you can read our tutorial on how to add code to the header and footer in WordPress. Keep in mind that even if you register a new alias, you’ll still be able to use “jQuery” instead of that symbol.

Once you understand what causes this (deceptively complicated!) looking error, fixing it is simple- learn how in this guide 🛠️Click to Tweet

Summary

WordPress enables you to use jQuery on your website. However, if you want to avoid errors such as “Uncaught TypeError: $ is not a function”, you’ll need to understand how the CMS implements the library. WordPress uses jQuery’s “noConflict” mode, which means it doesn’t recognize the “$” symbol.

The “Uncaught TypeError: $ is not a function” error appears when you try to use a function that calls jQuery using “$”. To circumvent this problem, you can type the full jQuery object instead or map the alias to a different symbol to avoid conflicts.

If you use Kinsta, you can enable WordPress debug mode in the MyKinsta dashboard to diagnose problems. Plus, all of our plans offer top-quality support to help you troubleshoot any issues that you may encounter. Check out our plans!

“Error: $ is not a function”, this is the error that was being thrown back at me while working on a WordPress site the other day. However for the life of me I couldn’t see why my, usual fine JavaScript code, was failing. Was it a problem with my jQuery code, my WordPress installation or both?

I reduced my code down to producing an alert when the DOM was ready, but still it threw the error:

Error: $ is not a function

Well I’m sure we’ve all had this error before, usually when we break or incorrectly reference the jQuery core library. However I doubled checked and it was definitely pointing to the right file.

After a little spree on Google and a bit of research, I found that WordPress loads jQuery in a ‘no-conflicts’ mode to significantly reduce the likelihood of it conflicting with other third party libraries that a owner may install on their blog/site.

What this means in my scenrario, was exactly what the error stated. In ‘no conflict’ mode the $ shortcut is disabled, so you must replace it with the word ‘jQuery’ (notice the capitalised Q).

So if you had a piece of script such as:

[js]$(document).ready(function() {
$(«.someClass»).hide();
$(«#elementID .anotherClass»).eq(2).show();
…
}[/js]

You’d replace all the dollar symbols with the string ‘jQuery’.

[js]jQuery(document).ready(function() {
jQuery(«.someClass»).hide();
jQuery(«#elementID .anotherClass»).eq(2).show();
…
}[/js]

So thats one way to circumnavigate the conflict free wrapper that WordPress applies to jQuery.

Another approach, jQuery and conflict modes…

In my situation I was importing some large chunks of jQuery code libraries, so I didn’t really want to duplicate my existing libraries just for the purposes of having one in ‘normal’ mode and one in ‘no-conflicts’ mode.

Then I read you can easily override the ‘no-conflict’ compatibility mode, score! Now normally you shouldn’t just jump in and override such a system, it is there for a reason you know! The WordPress system is built by some very brainy people, much better than myself, so if they think its a requirement for a vanilla install of their system then so be it. However with the project I was working on, I knew exactly what was installed already, and that no further plugins will be scheduled to be installed for a long time. Either way I dropped a few comments in the top of the jQuery source file, as well as a ReadMe file in the jQuery directory, just in case in the future it did become a problem.

Anyway… the solution turned out to be simple passing the dollar shortcut in as a argument for the ready function applied to the document. So our example code becomes:

[js]jQuery(document).ready(function( $ ) {
$(«.someClass»).hide();
$(«#elementID .anotherClass»).eq(2).show();
…
}[/js]

Notice we still have to use the conflict free wrapper to begin with, but once the page is ready the dollar shortcut will work for your existing code. So no need to go changing those libraries!

Hope that helps someone out, I was nearly tearing my hair out trying to work out why the error “$ is not a function” was being thrown

Currently, WordPress is the best website builder on the internet. It has gained its popularity due to the many features it offers. However, much like everything else, as good as this CMS may be, it comes with a few issues as well.

One of these issues is the $ is not a function WordPress error. This error can cause your website to display the 404 pages.

In this article, we would like to discuss the $ is not a function WordPress error.

What is the $ is not a function of WordPress Error?

$ is not a function WordPress error occurs when the code comes before the jQuery library. For example, if a plugin or theme calls a code before calling the right library, you get this error.

By default, WordPress doesn’t understand $ as jQuery and you have to make some modifications to fix this error. However, this process could be challenging for some users without any programming knowledge.

As always, before making any changes to the core files of WordPress, we recommend you get a full backup of your website. This is a must, because if you misplace a simple “;” you could completely ruin the website.

The backup is there to restore your website back to what it was before you made the modifications.

Use $ instead of jQuery in WordPress

One of the easy fixes is to use $ in WordPress instead of jQuery. You will have to enqueue the script in your theme’s functions.php file.

wp_enqueue_script("jquery");

Most WordPress theme and plugin developers are aware of this issue. Thus, they rather use jQuery instead of the $ sign to be safe.

For example, the normal jQuery anywhere should look like this:

$(“#element”).function();

In WordPress the jQuery looks like this:

jQuery(“#element”).function();

Writing jQuery in a script hundreds of times makes it harder to read and increases the size of the script. It’s recommended that you map jQuery to be mapped to $ in the footer of your website. Simply, copy and paste the following code in the footer file of your theme:

(function($) {
	// console.log($);
})( jQuery );

If you would like to add the code to the header of your theme, simply use the following code:

jQuery(document).ready(function( $ ) {
	// console.log($);
});

With this code, you can write a clean script for your website.

Use a New Name for jQuery

There are many changes you can make to the jQuery, one of them is the ability to change the $ to any particular name you have in mind. To use a new name for jQuery, simply use the following code and replace the name element with the name you have in mind.

var j = jQuery.noConflict();
j( "div p" ).hide();
// Do something with another library's $()
$( "content" ).style.display = "none";

Disable noConflict Mode

To turn off the jQuery.noConflict in WordPress, use the following command:

$ = jQuery.noConflict(true);

This code should turn off the noConflict mode completely.

The $.noConflict command gives you the ability to control the $ variable back to whatever library it was first assigned to. This command makes sure that jQuery doesn’t have any confliction with the $ object of other libraries.

Conclusion

In this article, we discussed the $ is not a function WordPress error. This error is usually caused when your code is called before calling the jQuery and if you are using $ instead of jQuery in WordPress.

By default, WordPress uses jQuery instead of the normal method of $ and this could cause your website to display the 404 error.

You can use a function in both header or footer to change the name $ to your desired name. Besides, you can disable the noConflict mode in WordPress. noConflict mode gives you the ability to control the $ variables and revert them to whatever library they were originally assigned to.

This mode prevents the confliction between the $ object of other libraries.