Document Ready Pattern
Document Ready Pattern: free step-by-step lesson with examples, common mistakes, and interview tips — part of jQuery Tutorial on Toolliyo Academy.
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jQuery Tutorial · Lesson 3 of 100
Document Ready Pattern
Setup & DOM → Events Effects AJAX → Perf & Integrate → Ship & Projects
Setup & DOM · 1 — Select · ~6 min · Setup and Selectors
What is this?
$(fn) or $(document).ready(fn) runs code after the DOM is ready — safer than putting scripts in
without defer.Why should you care?
QueryVerse widgets must not run before their targets exist.
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>
<p id="status" class="muted">…</p>
<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
<script>
$(function () {
$('#status').text('DOM ready — safe to select nodes');
console.log('ready');
});
</script>
</body>
</html>Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- Ready fires when HTML is parsed (images may still load).
- Prefer one ready block or modular handlers.
Practice next
- Move the script to mentally and see why ready matters.
- Add a second ready callback.
- Try $(document).ready(same).
- Add a button created in HTML and bind click in ready.
- Compare with defer on a script tag later.
Remember
Ready ≠ full page load. Select only after ready. Keep handlers organized.
Boot order
Script in layout head.
Outcome: Selectors find elements reliably.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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