Build an Interactive Webpage Without a Framework — Pure Vanilla JavaScript

You Don't Always Need a Framework

React and Vue are tools — not requirements. For many websites and projects, pure JavaScript is faster to write, easier to deploy, and teaches you more about how the web actually works.

In this guide, we build 5 real interactive components using zero dependencies.

Component 1 — Product Gallery with Filter and Search

The key pattern: keep all data in a JavaScript array, filter it, and re-render the HTML:

const PRODUCTS = [
  { name: 'Dark Mode Extension', cat: 'extension', desc: '...' },
  { name: 'QR Generator',        cat: 'tool',      desc: '...' },
  // ... more products
];

let activeCategory = 'all';
let searchQuery    = '';

function renderCards() {
  const filtered = PRODUCTS.filter(p => {
    const matchCat    = activeCategory === 'all' || p.cat === activeCategory;
    const matchSearch = p.name.toLowerCase().includes(searchQuery);
    return matchCat && matchSearch;
  });

  document.getElementById('card-grid').innerHTML =
    filtered.map(p => `<div class="card">${p.name}</div>`).join('');
}

Component 2 — Tab Switcher

Show one panel at a time with a simple class toggle:

document.querySelectorAll('.tab-btn').forEach(btn => {
  btn.addEventListener('click', () => {
    document.querySelectorAll('.tab-btn, .tab-panel')
      .forEach(el => el.classList.remove('active'));
    btn.classList.add('active');
    document.getElementById(btn.dataset.tab).classList.add('active');
  });
});

Component 3 — Accordion FAQ

Expand one item at a time with CSS max-height animation:

document.querySelectorAll('.acc-question').forEach(btn => {
  btn.addEventListener('click', () => {
    const item = btn.closest('.acc-item');
    const isOpen = item.classList.contains('open');
    // Close all
    document.querySelectorAll('.acc-item').forEach(i => i.classList.remove('open'));
    // Open clicked (if it was closed)
    if (!isOpen) item.classList.add('open');
  });
});

Component 4 — Modal with Escape Key

function closeModal() {
  document.getElementById('modal').classList.remove('open');
  document.body.style.overflow = '';
}

document.addEventListener('keydown', e => {
  if (e.key === 'Escape') closeModal();
});

This is a preview. The full ebook includes the complete CSS for all 5 components including the CSS transition for the accordion, the backdrop click handler, and the responsive mobile layout.