Learn Jquery - 9 Code Examples & CST Typing Practice Test

jQuery is a fast, small, and feature-rich JavaScript library designed to simplify DOM manipulation, event handling, animations, and AJAX interactions. It provides a unified API that works consistently across all major browsers.

View all 9 Jquery code examples →

jQuery Simple Counter jQuery Counter with Step jQuery Counter with Min/Max jQuery Counter with Auto Increment jQuery Counter with Double Increment jQuery Counter with Even/Odd Indicator jQuery Counter with Max/Min and Step jQuery Counter with LocalStorage jQuery Counter with Color Themes

Learn JQUERY with Real Code Examples

Updated Nov 23, 2025

Explain

jQuery simplifies DOM querying and manipulation using a clean selector engine.

It abstracts cross-browser inconsistencies to provide a uniform experience.

Its utilities and plugins make it ideal for enriching older or simpler websites.

Core Features

DOM manipulation

Event handling

Effects and animations

AJAX abstraction

Cross-browser compatibility

Basic Concepts Overview

Selectors using `$()`

DOM manipulation: `.html()`, `.text()`, `.css()`

Event binding: `.on()`

AJAX: `.ajax()`, `.get()`, `.post()`

Effects: `.fadeIn()`, `.slideToggle()`

Project Structure

index.html - main page

js/app.js - jQuery scripts

css/styles.css - optional styling

plugins/ - plugin scripts

assets/ - images and resources

Building Workflow

Load jQuery via CDN or local file

Wrap code in `$(document).ready()`

Select elements and manipulate them

Bind events to create interactivity

Use plugins or your own utilities

Difficulty Use Cases

Beginner: Selectors and events

Intermediate: AJAX & animations

Advanced: Custom plugins

Expert: Complex UI widgets

Community: jQuery plugin contributions

Comparisons

Simpler than React or Vue for small tasks

Better for legacy support than modern frameworks

More imperative than Vue/Svelte

More readable DOM handling than pure vanilla for beginners

Less scalable than component-based frameworks

Versioning Timeline

2006 - jQuery 1.0 released

2010 - jQuery 1.4 (major rewrite)

2013 - jQuery 2.x (removed old browser support)

2016 - jQuery 3.x released

2025 - Still widely used in enterprise & CMS

Glossary

Selector: CSS-inspired element query

Chainable Methods: Execute functions consecutively

Event Delegation: Handling events on dynamic elements

Plugin: Reusable jQuery functionality

Deferred: Promise-like async handling

Code Sample Descriptions

jQuery Simple Counter

$(document).ready(function() {
    var count = 0;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Basic counter with increment, decrement, reset, and theme toggle.

Let’s Try →

jQuery Counter with Step

$(document).ready(function() {
    var count = 0;
    var step = 5;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count += step; updateCounter(); });
    $('#decrement').click(function() { count -= step; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Counter increments/decrements by a custom step value.

Let’s Try →

jQuery Counter with Min/Max

$(document).ready(function() {
    var count = 0;
    var min = 0;
    var max = 10;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { if(count < max) count++; updateCounter(); });
    $('#decrement').click(function() { if(count > min) count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Counter that respects minimum and maximum limits.

Let’s Try →

jQuery Counter with Auto Increment

$(document).ready(function() {
    var count = 0;
    var isDark = false;
    var auto = false;
    var timer;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
        $('#auto-btn').text(auto ? 'Stop Auto' : 'Start Auto');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });
    $('#auto-btn').click(function() {
        auto = !auto;
        if(auto) timer = setInterval(function(){ count++; updateCounter(); }, 1000);
        else clearInterval(timer);
        updateCounter();
    });

    updateCounter();
});

Counter automatically increments every second.

Let’s Try →

jQuery Counter with Double Increment

$(document).ready(function() {
    var count = 0;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#double-increment').click(function() { count += 2; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Special button increments counter by 2.

Let’s Try →

jQuery Counter with Even/Odd Indicator

$(document).ready(function() {
    var count = 0;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#parity').text(count % 2 === 0 ? 'Even' : 'Odd');
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Shows whether the counter value is even or odd.

Let’s Try →

jQuery Counter with Max/Min and Step

$(document).ready(function() {
    var count = 0;
    var step = 5;
    var min = 0;
    var max = 50;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { if(count + step <= max) count += step; updateCounter(); });
    $('#decrement').click(function() { if(count - step >= min) count -= step; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Counter with custom step value and boundaries.

Let’s Try →

jQuery Counter with LocalStorage

$(document).ready(function() {
    var count = parseInt(localStorage.getItem('count') || 0);
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
        localStorage.setItem('count', count);
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Persists counter value in localStorage.

Let’s Try →

jQuery Counter with Color Themes

$(document).ready(function() {
    var count = 0;
    var themes = ['light-theme','dark-theme','blue-theme'];
    var current = 0;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').attr('class', themes[current]);
        $('#theme-btn').text('Switch Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { current = (current + 1) % themes.length; updateCounter(); });

    updateCounter();
});

Cycles through multiple color themes.

Let’s Try →

Frequently Asked Questions about Jquery

What is Jquery?

What are the primary use cases for Jquery?

Legacy websites and enterprise systems. WordPress plugins and themes. Quick DOM scripting and UI enhancements. Form validation and AJAX requests. Projects needing wide browser compatibility

What are the strengths of Jquery?

Very easy to learn. Massive ecosystem and community. Ideal for simple interactive scripts. Works everywhere - even IE. Minimal setup required

What are the limitations of Jquery?

Not suited for modern SPA architecture. Heavy DOM mutation patterns. Less relevant with modern browser APIs. Harder to scale in large apps. Performance issues with deeply nested DOM updates

How can I practice Jquery typing speed?

CodeSpeedTest offers 9+ real Jquery code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

Learn Other Programming Languages

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Code Sample Descriptions

jQuery Simple Counter

$(document).ready(function() {
    var count = 0;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Basic counter with increment, decrement, reset, and theme toggle.

Let’s Try →

jQuery Counter with Step

$(document).ready(function() {
    var count = 0;
    var step = 5;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count += step; updateCounter(); });
    $('#decrement').click(function() { count -= step; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Counter increments/decrements by a custom step value.

Let’s Try →

jQuery Counter with Min/Max

$(document).ready(function() {
    var count = 0;
    var min = 0;
    var max = 10;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { if(count < max) count++; updateCounter(); });
    $('#decrement').click(function() { if(count > min) count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Counter that respects minimum and maximum limits.

Let’s Try →

jQuery Counter with Auto Increment

$(document).ready(function() {
    var count = 0;
    var isDark = false;
    var auto = false;
    var timer;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
        $('#auto-btn').text(auto ? 'Stop Auto' : 'Start Auto');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });
    $('#auto-btn').click(function() {
        auto = !auto;
        if(auto) timer = setInterval(function(){ count++; updateCounter(); }, 1000);
        else clearInterval(timer);
        updateCounter();
    });

    updateCounter();
});

Counter automatically increments every second.

Let’s Try →

jQuery Counter with Double Increment

$(document).ready(function() {
    var count = 0;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#double-increment').click(function() { count += 2; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Special button increments counter by 2.

Let’s Try →

jQuery Counter with Even/Odd Indicator

$(document).ready(function() {
    var count = 0;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#parity').text(count % 2 === 0 ? 'Even' : 'Odd');
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Shows whether the counter value is even or odd.

Let’s Try →

jQuery Counter with Max/Min and Step

$(document).ready(function() {
    var count = 0;
    var step = 5;
    var min = 0;
    var max = 50;
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
    }

    $('#increment').click(function() { if(count + step <= max) count += step; updateCounter(); });
    $('#decrement').click(function() { if(count - step >= min) count -= step; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Counter with custom step value and boundaries.

Let’s Try →

jQuery Counter with LocalStorage

$(document).ready(function() {
    var count = parseInt(localStorage.getItem('count') || 0);
    var isDark = false;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').toggleClass('dark-theme', isDark);
        $('#container').toggleClass('light-theme', !isDark);
        $('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
        localStorage.setItem('count', count);
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });

    updateCounter();
});

Persists counter value in localStorage.

Let’s Try →

jQuery Counter with Color Themes

$(document).ready(function() {
    var count = 0;
    var themes = ['light-theme','dark-theme','blue-theme'];
    var current = 0;

    function updateCounter() {
        $('#counter').text(count);
        $('#container').attr('class', themes[current]);
        $('#theme-btn').text('Switch Theme');
    }

    $('#increment').click(function() { count++; updateCounter(); });
    $('#decrement').click(function() { count--; updateCounter(); });
    $('#reset').click(function() { count = 0; updateCounter(); });
    $('#theme-btn').click(function() { current = (current + 1) % themes.length; updateCounter(); });

    updateCounter();
});

Cycles through multiple color themes.

Let’s Try →

Frequently Asked Questions about Jquery

What is Jquery?

What are the primary use cases for Jquery?

Legacy websites and enterprise systems. WordPress plugins and themes. Quick DOM scripting and UI enhancements. Form validation and AJAX requests. Projects needing wide browser compatibility

What are the strengths of Jquery?

Very easy to learn. Massive ecosystem and community. Ideal for simple interactive scripts. Works everywhere - even IE. Minimal setup required

What are the limitations of Jquery?

Not suited for modern SPA architecture. Heavy DOM mutation patterns. Less relevant with modern browser APIs. Harder to scale in large apps. Performance issues with deeply nested DOM updates

How can I practice Jquery typing speed?

CodeSpeedTest offers 9+ real Jquery code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

Learn Jquery - 9 Code Examples & CST Typing Practice Test

Learn JQUERY with Real Code Examples

Explain

Core Features

Basic Concepts Overview

Project Structure

Building Workflow

Difficulty Use Cases

Comparisons

Versioning Timeline

Glossary

Installation Setup

Environment Setup

Config Files

Cli Commands

Internationalization

Accessibility

Ui Styling

State Management

Data Management

Architecture

Rendering Model

Architectural Patterns

Real World Architectures

Design Principles

Scalability Guide

Migration Guide

Performance Notes

Security Notes

Monitoring Analytics

Code Quality

Practical Examples

Troubleshooting

Testing Guide

Deployment Options

Tools Ecosystem

Integrations

Productivity Tips

Challenges

Learning Path

Skill Improvement Plan

Interview Questions

Cheat Sheet

Books

Tutorials

Official Docs

Community Links

Community Support

Monetization

Future Roadmap

When Not To Use

Final Summary

Faq

Code Sample Descriptions

jQuery Simple Counter

jQuery Counter with Step

jQuery Counter with Min/Max

jQuery Counter with Auto Increment

jQuery Counter with Double Increment

jQuery Counter with Even/Odd Indicator

jQuery Counter with Max/Min and Step

jQuery Counter with LocalStorage

jQuery Counter with Color Themes

Frequently Asked Questions about Jquery

What is Jquery?

What are the primary use cases for Jquery?

What are the strengths of Jquery?

What are the limitations of Jquery?

How can I practice Jquery typing speed?

Learn Other Programming Languages

Learn Jquery - 9 Code Examples & CST Typing Practice Test

Learn JQUERY with Real Code Examples

Explain

Core Features

Basic Concepts Overview

Project Structure

Building Workflow

Difficulty Use Cases

Comparisons

Versioning Timeline