Write a Tiny Plugin
Write a Tiny Plugin: free step-by-step lesson with examples, common mistakes, and interview tips — part of jQuery Tutorial on Toolliyo Academy.
On this page
jQuery Tutorial · Lesson 57 of 100
Write a Tiny Plugin
Setup & DOM ✓ → Events Effects AJAX ✓ → Perf & Integrate → Ship & Projects
Perf & Integrate · 3 — Harden · ~10 min · Traversal and Plugins
What is this?
Write a Tiny Plugin walks the DOM or extends jQuery with reusable helpers.
Why should you care?
Complex pages need traversal and small shared plugins.
See it live — copy this example
Examples include the jQuery 3.7 CDN. Paste into an HTML file or use Run Example to preview.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>QueryVerse</title>
<style>
body { font-family: system-ui, sans-serif; margin: 1.25rem; }
.box { padding: .75rem; border: 1px solid #ccc; border-radius: 8px; margin: .5rem 0; }
.muted { color: #666; }
button { margin-right: .35rem; margin-top: .35rem; }
</style>
</head>
<body>
<div class="box"><p class="item">One</p><p class="item">Two</p></div>
<button id="run">Traverse</button>
<p id="out" class="muted"></p>
<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
<script>
$(function () {
$('#run').on('click', function () {
$('#out').text('count=' + $('.item').length + ' · Write a Tiny Plugin');
});
});
</script>
</body>
</html>Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- find/closest/filter carefully; keep plugins tiny and documented.
- Follow the steps below — typing the code yourself is the fastest way to learn.
Practice next
- Paste the example into an HTML file and open it.
- Change one selector or string and refresh.
- Watch the console for errors.
- Cache a jQuery selection in a const $el.
- Add a fail path if the lesson touches AJAX.
Remember
You can explain Write a Tiny Plugin simply. You ran a small jQuery demo. You know one pitfall.
Write a Tiny Plugin in QueryVerse
Your team applies write a tiny plugin on an admin page.
Outcome: A concrete next coding step exists.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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