Modern MVC for building user interfaces

const model = new Model({ count : 0 });

const Counter = Component.create`
    <div
        onClick=${{
            '.up' : () => model.count++,
            '.down' : () => model.count--,
        }}
    >
        <div>Counter: ${() => model.count}</div>
        <button class="up">Increment</button>
        <button class="down">Decrement</button>
    </div>
`;

Counter.mount({ model }, document.body);

Getting Started

Installing via npm

$ npm install rasti

import { Model, Component } from 'rasti';

Using ES modules

import { Model, Component } from 'https://esm.run/rasti';

Using a <script> tag

<script src="https://cdn.jsdelivr.net/npm/rasti/dist/rasti.min.js"></script>

const { Model, Component } = Rasti;

Create a Component

// Define a Timer component that displays the number of seconds from the model.
const Timer = Component.create`
    <div>
        Seconds: <span>${({ model }) => model.seconds}</span>
    </div>
`;

// Create a model to store the seconds.
const model = new Model({ seconds: 0 });

// Mount the Timer component to the body and pass the model as an option.
Timer.mount({ model }, document.body);

// Increment the `seconds` property of the model every second.
setInterval(() => model.seconds++, 1000);

Try it on CodePen

Adding sub components

// Define the routes for the navigation menu.
const routes = [
    { label: 'Home', href: '#' },
    { label: 'Faq', href: '#faq' },
    { label: 'Contact', href: '#contact' },
];

// Create a Link component for navigation items.
const Link = Component.create`
    <a href="${({ options }) => options.href}">
        ${({ options }) => options.renderChildren()}
    </a>
`;

// Create a Navigation component that renders Link components for each route.
const Navigation = Component.create`
    <nav>
        ${({ options, partial }) => options.routes.map(
            ({ label, href }) => partial`<${Link} href="${href}">${label}</${Link}>`
        )}
    </nav>
`;

// Create a Main component that includes the Navigation and displays the current route's label as the title.
const Main = Component.create`
    <main>
        <${Navigation} routes=${({ options }) => options.routes} />
        <section>
            <h1>
                ${({ model, options }) => options.routes.find(
                    ({ href }) => href === (model.location || '#')
                ).label}
            </h1>
        </section>
    </main>
`;

// Initialize a model to store the current location.
const model = new Model({ location: document.location.hash });

// Update the model's location state when the browser's history changes.
window.addEventListener('popstate', () => model.location = document.location.hash);

// Mount the Main component to the body, passing the routes and model as options.
Main.mount({ routes, model }, document.body);

Try it on CodePen

Why Choose Rasti?

Rasti is built for developers who want a simple yet powerful way to create UI components without the complexity of heavy frameworks. Whether you're prototyping, building a high-performance dashboard, or modernizing a Backbone.js app, Rasti lets you:

• Skip the Setup
  No installations, no build tools—just load it and start coding.
• Lightweight and Efficient
  Minimal footprint with optimized performance, ensuring smooth updates.
• Upgrade Legacy Code Without a Rewrite
  Incrementally enhance Backbone.js views while keeping existing functionality.

Example

You can find a sample TODO application in the example folder of the Rasti GitHub repository. This example serves as a great starting point for your own projects. Try it live here.

API Documentation

For detailed information on how to use Rasti, refer to the API documentation.

Powered by Rasti

Crypto Babylon

A market analytics platform efficiently rendering over 300 dynamic rows, updated in real-time with thousands of messages per second via multiple WebSocket connections.

jsPacman

A DOM-based remake of the classic Ms. Pac-Man game. Rasti powers its custom game engine.