Can I use this skill for WordPress sites?

Yes, it includes specific patterns for dequeuing old jQuery versions and enqueuing jQuery 4.0 with the migration plugin in WordPress themes to ensure plugin compatibility.

How does the focus event order change in version 4.0?

jQuery 4.0 now follows the W3C standard (blur -> focusout -> focus -> focusin), which differs from the legacy order used in version 3.x and may affect form validation logic.

What are the most common errors when upgrading to jQuery 4.0?

The most frequent issues are 'is not a function' errors for removed utilities like $.isArray, $.trim, and $.parseJSON, which now require native JavaScript equivalents like Array.isArray() and JSON.parse().

What is the difference between the Slim and Full builds in jQuery 4?

The Slim build excludes AJAX, effects (animations), and Deferreds to save space. If your project relies on $.ajax or $.animate, you must use the Full build.

Is Internet Explorer 11 still supported in jQuery 4.0?

Yes, jQuery 4.0 continues to support IE 11, though support for IE 10 and older versions has been officially dropped.

jQuery 4 Migration Tool

Name: jQuery 4 Migration Tool
Author: evolv3ai

byevolv3ai

0•

Content Management

Facilitates the safe migration of WordPress and legacy web projects from jQuery 3.x to 4.0.0 by identifying and resolving breaking changes.

This skill provides comprehensive guidance for upgrading legacy JavaScript projects and WordPress themes to jQuery 4.0.0. It systematically addresses the removal of legacy utility functions like $.isArray and $.trim, manages the transition to W3C-standard focus event ordering, and ensures compatibility with modern security features like Trusted Types. By integrating the jQuery Migrate plugin and providing native JavaScript replacements for deprecated methods, it helps developers prevent production errors while modernizing their codebase for the next generation of web standards.

Key Features

01Automated identification of removed jQuery utility functions and their native JS replacements

02Implementation guidance for ES modules and Trusted Types support in jQuery 4.0

03Detailed troubleshooting for breaking changes in focus/blur event ordering and slim build limitations

04Configuration of jQuery Migrate 4.0.2 for safe debugging and compatibility shimming

05Step-by-step WordPress-specific migration workflows and plugin conflict audits

060 GitHub stars

Use Cases

01Modernizing a codebase to use native JavaScript alternatives for deprecated jQuery methods

02Upgrading a legacy enterprise web application to jQuery 4.0 while maintaining stability

03Fixing '$.isArray is not a function' errors in a WordPress theme after a library update

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add evolv3ai/claude-skills-archive jquery-4

For use in Claude.ai and ChatGPT

Download Skill