// DOM elements const fileInput = document.getElementById('fileInput'); const fileMeta = document.getElementById('fileMeta'); const encryptBtn = document.getElementById('encryptAndSimulateBtn'); const resetSender = document.getElementById('resetSenderBtn'); const senderStatusDiv = document.getElementById('senderStatus'); const tokenTextarea = document.getElementById('tokenInput'); const decryptBtn = document.getElementById('decryptAndReceiveBtn'); const receiverInfo = document.getElementById('receiverFileInfo'); const receiverProgressFill = document.getElementById('receiverProgress'); const receiverStatusDiv = document.getElementById('receiverStatus');
let chunks = []; let totalChunks = 0; receiveChannel.onmessage = async (event) => const packet = JSON.parse(event.data); totalChunks = packet.total; const decrypted = await crypto.subtle.decrypt( name: 'AES-GCM', iv: packet.iv , key, packet.data); chunks.push(decrypted); if (chunks.length === totalChunks) const blob = new Blob(chunks); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'received_file'; a.click();
// For receiver: listen for data channel peerConnection.ondatachannel = (event) => const receiveChannel = event.channel; receiveChannel.binaryType = 'arraybuffer'; // handle incoming chunks ;
Before diving into a massive repository of 60 projects, it is vital to understand why using pure (vanilla) technologies is so advantageous:
Smooth height transitions for user questions. // DOM elements const fileInput = document
The answer is twofold. First, . The core web platform—HTML5, CSS3, JavaScript—endures. Understanding vanilla JS means you can quickly pick up any framework, debug browser quirks, and optimize performance in ways that framework‑only developers often cannot.
Section 3: Deep dive - Building a secure large file transfer app with vanilla JS, HTML5, CSS3. Explain challenges: file size, security (encryption), free solutions. Use Web Crypto API for client-side encryption, IndexedDB or File API for chunking. Implement drag-and-drop, progress bars, end-to-end encryption. Provide code structure.
const CHUNK_SIZE = 16384; // 16 KB chunks let fileReader = new FileReader(); let offset = 0; function readNextChunk(file) const slice = file.slice(offset, offset + CHUNK_SIZE); fileReader.readAsArrayBuffer(slice); fileReader.onload = (event) => const buffer = event.target.result; // Send this specific binary buffer through the WebRTC Data Channel rtcDataChannel.send(buffer); offset += buffer.byteLength; if (offset < file.size) readNextChunk(file); // Continue streaming the file stream else console.log("File transfer complete!"); ; Use code with caution. Step 2: Receiving and Reassembling the File Securely
The primary goal of this curriculum is to move beyond theory and build a diverse portfolio without relying on external libraries or frameworks. Learners typically progress through three phases: The core web platform—HTML5, CSS3, JavaScript—endures
Explain why you chose a specific structure or vanilla logic function over another.
By working through these 60 projects, you’ll gain hands‑on experience with:
Collect chunks in an array, then combine into a Blob and trigger download.
Sample frequencies from a microphone or track using the Web Audio API to paint canvases. To transfer very large files (e.g.
Fetch data from a public API using fetch() .
: Create a sleek, expanding search input with CSS transitions. Multi-step Progress Bar : Design a UI for multi-page forms or processes. Phase 2: Intermediate Vanilla JavaScript (Days 21–40) Introduce DOM manipulation and simple event handling. Digital Clock object to update time in real-time. Quote Generator : Pull random quotes and add a "Tweet This" button. To-Do List App : Practice adding, deleting, and marking tasks as complete. Basic Calculator : Handle mathematical logic and button click events. BMI Calculator
label font-size: 0.8rem; font-weight: 500; text-transform: uppercase; letter-spacing: 1px; color: #94a3b8; display: block; margin-bottom: 0.3rem;
To transfer very large files (e.g., gigabyte-scale video or dataset components) without causing browser memory leaks or tab crashes, we process files in tiny logical segments using the HTML5 FileReader API combined with the Web Crypto API . javascript