Updating jQuery shipped with WordPress to version 4.0

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Just a quick note that the Test jQuery Updates plugins was updated to include the most recent versions: jQuery 4.0.0-beta.2 and jQuery Migrate 3.5.2. The plan is to update jQuery to version 4.0 soon after it is released, most likely in WordPress 6.8.

It seems this update will be a lot less likely to trigger errors than the previous one. Nevertheless, early, extensive testing would be great. Testing jQuery 4.0 betaBeta A pre-release of software that is given out to a large group of users to trial under real conditions. Beta versions have gone through alpha testing in-house and are generally fairly close in look, feel and function to the final product; however, design changes often occur as part of the process. would also allow the WordPress community to provide feedback to the jQuery team, and help resolve any possible problems before the release.

How to help with testing

Just install and activate the Test jQuery Updates pluginPlugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party on a test site. There are no additional settings, activating it will replace the bundled versions of jQuery and jQuery Migrate with the versions from the plugin. Then continue as usual. If you notice any errors with a jQuery related script, please report them. If you’re able to troubleshoot them and find the exact cause, please report them directly to the jQuery team. To stop testing, deactivate the plugin.

Another very nice way would be to test in a WordPress Playground. This method doesn’t require a test site. It can also be used to test if other plugins may be affected by the updated jQuery.

Thanks @ironprogrammer for the review and suggestions.

#jquery

neo2k23 2:25 pm on August 26, 2024

I consulted the change logs for jquery 4.0. The issues i instantly ran into using 4.0 is that .sort .push and .splice have been removed.

Why? Because they were undocumented functions?

I know many jquery scripts uses the sort function like this

$element.filterFilter Filters are one of the two types of Hooks https://codex.wordpress.org/Plugin_API/Hooks. They provide a way for functions to modify data of other functions. They are the counterpart to Actions. Unlike Actions, filters are meant to work in an isolated manner, and should never have side effects such as affecting global variables and output.( some filtering function ).sort( some sorting function ).append( the append function );

They will all run into issues with jQuery 4.0 as they get “a .sort function does not exist!” error.

The jQuery team would have better created a deprecated route like they did on all other deprecated or changed functions.

Now many scripts (and many scripts have been abandonned by its original developers) will face a sudden death and will fail when jquery 4.0 becomes default in WordPress 6.8. This will cause themes that are using these removed functions to stop working.

Because something was never documented does not mean that it should be removed without a deprecation path / timeline.

I can not say i am happy about this decision from the jQuery team.

Anyway thanks for the heads up on this and the pluginPlugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party for testing the latest jQuery 4.0-beta2.

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