Remove use of jQuery ready()

[wpnomad]

ready() has been [deprecated](​https://api.jquery.com/ready/), but we still use it in some places:

• wp-content/themes/twentytwenty/assets/js/customize.js

(and maybe more).

Can this be reviewed? A report to change the same in WooCommerce core is here: ​https://github.com/woocommerce/woocommerce/issues/27945

[sabernhardt]

Yes, several admin scripts and most bundled themes use .ready() at least once.

Related: #37110 and #50564

[malthert]

I reported this originally for WP (& also the WooCommerce issue is from me) - I think in fact we should not only change the .ready() event, but also include info about this change somewhere prominently, so all plugin authors are aware that they should change it too.

The process for this has already been started for all plugins sold on WooCommerce, so this will be finished before WP5.6 is released for those at least.

[SergeyBiryukov]

It looks like most of jQuery(document).ready() instances were removed in [50547] / #51812, but some are still left in these files:

• js/_enqueues/vendor/mediaelement/wp-playlist.js
• js/_enqueues/vendor/plupload/handlers.js
• js/_enqueues/vendor/swfupload/handlers.js
• js/_enqueues/vendor/thickbox/thickbox.js

These are all either WordPress files (and not external dependencies) or "adopted" libraries that have been patched in the past (in the case of Thickbox), so should be safe to patch.

[SergeyBiryukov]

There are also a few instances in bundled themes:

• wp-content/themes/twentyeleven/inc/theme-options.js
• wp-content/themes/twentyeleven/js/showcase.js
• wp-content/themes/twentyfifteen/js/functions.js
• wp-content/themes/twentyfourteen/js/featured-content-admin.js
• wp-content/themes/twentyseventeen/assets/js/global.js
• wp-content/themes/twentysixteen/js/functions.js
• wp-content/themes/twentytwenty/assets/js/customize.js
• wp-content/themes/twentytwenty/assets/js/customize-preview.js

These may be harder to remove, as the themes must remain compatible with older WP versions they were released in, and possibly one or two versions before that.

[peterwilsoncc]

Replying to SergeyBiryukov:

These may be harder to remove, as the themes must remain compatible with older WP versions they were released in, and possibly one or two versions before that.

The jQuery( callback ) technique was ​added in jQuery 1.0 prior to WordPress's introduction of jQuery 1.1 in [4904] so I think removing the jQuery( document ).ready() statement on the older themes should be fine.

If I am missing something then the older themes may be able to use something along the lines of:

if ( document.readyState !== 'loading' ) {
        readyCallback();
} else {
        window.addEventListener( 'DOMContentLoaded', readyCallback, false );
}

[Clorith]

That's correct, it shouldn't be any concern replacing their use in the themes as well without the readyState workaround

Replace jQuery ready() with the alternate syntax $( function() {} ) because ready() has been deprecated.

Trac ticket:https://core.trac.wordpress.org/ticket/51519

[prbot]

​Clorith commented on ​PR #1190:

Thank you for the PR, it does look like there's some accidentally included extra files related to PHP, namely the src/wp-includes/assets/script-loader-packages.php and tests/phpunit/data/link-manager.zip.

Would you be able to refresh your PR to not include these unrelated files?