Lesson 36/100

Tutorials jQuery Tutorial

delay and queue

delay and queue: 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 36 of 100

delay and queue

Setup & DOM ✓Events Effects AJAXPerf & IntegrateShip & Projects

Events Effects AJAX · 2 — Interact · ~6 min · Effects

What is this?

delay(ms) pauses the fx queue before the next animation. queue()/dequeue() let you inject custom steps into that queue for sequenced UI.

Why should you care?

QueryVerse multi-step feedback (highlight → pause → fade) reads clearer as a queue than nested timeouts.

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; }
    input, select, textarea { margin: .25rem 0; }
    table { border-collapse: collapse; width: 100%; }
    th, td { border: 1px solid #ddd; padding: .4rem .55rem; text-align: left; }
    .hidden { display: none; }
    .row-odd { background: #f7f7f7; }
    .active { font-weight: 700; }
    .toast { background: #111; color: #fff; padding: .5rem .75rem; border-radius: 6px; }
  </style>
</head>
<body>
  <button type="button" id="seq">Run sequence</button>
  <div id="note" class="box">Idle</div>
<script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
<script>
$(function () {
  $('#seq').on('click', function () {
    $('#note')
      .text('Saving…')
      .fadeTo(120, 0.4)
      .delay(500)
      .fadeTo(120, 1)
      .queue(function (next) {
        $(this).text('Saved');
        next();
      })
      .delay(600)
      .fadeOut(150)
      .fadeIn(150)
      .queue(function (next) {
        $(this).text('Idle');
        next();
      });
  });
});
</script>
</body>
</html>

Run Example »

Edit the code below and click Run to see the result in Toolliyo’s live editor.

Code
Result

What happened?

  • delay only affects the animation queue, not arbitrary code — wrap code in .queue(fn) and call next().
  • clearQueue() drops pending fx steps.

Practice next

  1. Run the sequence once end-to-end.
  2. Click rapidly and then stop(true,true).
  3. Insert another .queue log step.
  4. Use .clearQueue().stop() on cancel.
  5. Name queues only if you need parallel custom queues.

Remember

delay pauses the fx queue. queue adds custom steps. Always call next().

Save acknowledgement

A Razorpay dashboard QueryVerse settings page shows Saving → pause → Saved in order.

Outcome: delay + queue sequences feedback without nested timeouts.

Interview prep for this lesson

Practice these questions aloud after reading—each links to a full structured answer.

Junior Detailed
Explain JavaScript in the context of jQuery.
Short answer: JavaScript runs single-threaded with an event loop. Closures capture lexical scope; promises/async handle I/O without blocking the UI thread. Real-world example (ShopNest) On the ShopNest storefront UI, thi…
Mid Detailed
What are common mistakes teams make with Components when using jQuery?
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Component…
Senior Detailed
How would you debug a production issue related to State in a jQuery application?
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define State in…
Junior Detailed
Describe a real-world scenario where Performance mattered in a jQuery project.
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Performan…
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jQuery Tutorial
Course syllabus

jQuery Tutorial

Setup and Selectors
DOM Updates
Events
Effects
AJAX and APIs
Traversal and Plugins
Performance and Security
App Integration
Debug and Modernize
Projects
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