A complete beginner-to-intermediate JavaScript DOM learning repository.
This project is designed to help students understand the Document Object Model (DOM) through hands-on examples, detailed explanations, commented code, and topic-specific README files.
Instead of only learning theory, every DOM concept is demonstrated with working examples that can be run directly in the browser.
DOM stands for Document Object Model.
When a browser loads an HTML page, it converts the HTML into a tree-like structure called the DOM.
JavaScript uses the DOM to:
- Access elements
- Modify content
- Change styles
- Handle user interactions
- Create new elements
- Store data
- Validate forms
- Update the webpage dynamically
Visual Representation:
HTML Page
↓
Browser
↓
DOM Tree
↓
JavaScript Manipulates Elements
DOM is the foundation of modern frontend development.
The purpose of this repository is to provide a practical guide for learning JavaScript DOM manipulation.
Every topic includes:
✅ Working Example
✅ Detailed Comments
✅ Beginner-Friendly Explanation
✅ Dedicated README
✅ Real World Use Cases
✅ Common Beginner Questions
DOM_PLAYGROUND/
│
├── 01-selecting-elements/
├── 02-changing-content/
├── 03-input-values/
├── 04-styling-elements/
├── 05-classes/
├── 06-creating-elements/
├── 07-events/
├── 08-attributes/
├── 09-dom-traversing/
├── 10-timing-functions/
├── 11-local-storage/
├── 12-forms/
├── 13-window-object/
│
├── assets/
├── .gitignore
└── README.md
Learn how to find elements inside a webpage.
Methods Covered:
- getElementById()
- querySelector()
- querySelectorAll()
- getElementsByClassName()
- getElementsByTagName()
Used For:
- Buttons
- Forms
- Headings
- Cards
- Lists
Learn how JavaScript updates webpage content.
Methods Covered:
- innerHTML
- innerText
- textContent
Used For:
- Dynamic Content
- Labels
- Task Managers
- Dashboards
Learn how to read user input.
Property Covered:
- value
Used For:
- Login Forms
- Search Bars
- Registration Pages
Learn how JavaScript changes CSS dynamically.
Property Covered:
- style
Used For:
- Dark Mode
- Animations
- Dynamic UI Updates
Learn how to add, remove, and toggle CSS classes.
Methods Covered:
- classList.add()
- classList.remove()
- classList.toggle()
- classList.contains()
Used For:
- Navigation Menus
- Dark Mode
- Task Completion
Learn how webpages create content dynamically.
Methods Covered:
- createElement()
- appendChild()
- prepend()
- remove()
Used For:
- Todo Apps
- Chat Applications
- Dynamic Lists
Learn how webpages respond to user actions.
Method Covered:
- addEventListener()
Events Covered:
- click
- keydown
- input
- change
- mouseover
Used For:
- Interactive Websites
- Forms
- Buttons
- Games
Learn how to manage element attributes.
Methods Covered:
- setAttribute()
- getAttribute()
Used For:
- Images
- Links
- Accessibility
- Dynamic Updates
Learn how to move around the DOM tree.
Methods Covered:
- parentElement
- children
- firstElementChild
- lastElementChild
Used For:
- Component Navigation
- Dynamic Interfaces
- Complex Layouts
Learn how JavaScript executes code after delays.
Methods Covered:
- setTimeout()
- setInterval()
- clearTimeout()
- clearInterval()
Used For:
- Timers
- Clocks
- Games
- Notifications
Learn how browsers store data permanently.
Methods Covered:
- setItem()
- getItem()
- removeItem()
- clear()
- key()
- length
Used For:
- User Preferences
- Dark Mode
- Shopping Carts
- Remember Me Features
Learn how forms work and why pages refresh.
Methods Covered:
- preventDefault()
Concepts Covered:
- Form Submission
- Validation
- Event Object
- Default Browser Behavior
Used For:
- Login Systems
- Registration Forms
- Search Pages
Learn the root object of browser JavaScript.
Methods Covered:
- alert()
- prompt()
- confirm()
Events Covered:
- click
- keydown
- input
- change
- submit
- mouseover
Used For:
- Browser Interaction
- User Prompts
- Confirmation Dialogs
Throughout this repository, you'll repeatedly see this workflow:
Select Element
↓
Listen To Event
↓
Create / Modify Element
↓
Update The Page
Example:
let btn = document.querySelector("button");
btn.addEventListener("click", function () {
let li = document.createElement("li");
li.innerText = "New Task";
document
.querySelector("ul")
.appendChild(li);
});git clone https://github.com/sambhav-26/DOM_Playgound.gitFor beginners:
01-selecting-elements
↓
02-changing-content
↓
03-input-values
↓
04-styling-elements
↓
05-classes
↓
06-creating-elements
↓
07-events
↓
08-attributes
↓
09-dom-traversing
↓
10-timing-functions
↓
11-local-storage
↓
12-forms
↓
13-window-object
Follow this order to build concepts progressively.
This repository is ideal for:
- Beginners Learning JavaScript
- College Students
- Frontend Development Beginners
- Self-Learners
- Hackathon Participants
- Anyone Preparing for JavaScript Interviews
No.
Understanding DOM first makes React much easier to learn.
Because every frontend framework ultimately interacts with the DOM.
Yes.
Every website uses:
- Events
- Forms
- Local Storage
- DOM Manipulation
daily.
Yes.
A solid understanding of these topics provides a strong foundation for:
- React
- Next.js
- Vue
- Angular
Contributions are welcome.
Possible improvements:
- New examples
- Better UI demonstrations
- Additional DOM methods
- Mini projects
If you have questions, suggestions, or find an issue:
This project is intended for educational and learning purposes.
Feel free to use, modify, and learn from the examples.
The DOM is where JavaScript becomes interactive.
Once you understand how to:
- Select Elements
- Listen to Events
- Modify Content
- Create Elements
- Store Data
- Handle Forms
you have learned the core skills behind modern frontend development.
Happy Coding! 🚀