# Jquery

> jQuery DOM manipulation and AJAX for legacy projects. Use for older web projects.

- Skill: `g1joshi/jquery` (Agent Skill)
- Install (CLI): `npx skillmds@latest add g1joshi/jquery`
- Raw SKILL.md: https://api.skillmd.com/api/skills/g1joshi/jquery/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: G1Joshi (https://skillmd.com/u/g1joshi)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/g1joshi/jquery

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# jQuery

jQuery v4.0 (2025) is a cleanup release, removing IE support and shrinking the file size. While not for new apps, it remains vital for legacy maintenance and WordPress.

## When to Use

- **Legacy Maintenance**: Supporting 2010-era websites.
- **WordPress**: Heavily relied upon by WP plugins.
- **Quick Scripts**: Sometimes `$('.class').hide()` is all you need.

## Core Concepts

### The `$` function

DOM selection shorthand.

### Chaining

`$('#id').css('color', 'red').slideUp(2000)`.

### AJAX

`$.ajax({...})`. (Use `fetch` in modern JS).

## Best Practices (2025)

**Do**:

- **Upgrade to v4**: Drop support for IE11.
- **Use Vanilla JS**: For new features (`document.querySelector`).

**Don't**:

- **Don't verify new projects**: Use React/Vue/Svelte/Vanilla.

## References

- [jQuery Documentation](https://jquery.com/)