G1Joshi 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.