FeedJS Runtime

FeedJS Runtime provides the browser-side functionality to render FeedJS templates. It handles DOM creation, event binding, state management, and client-side routing.

Features

• DOM Rendering: Creates actual DOM elements from VNodes
• Event Binding: Handles f-on:* directives for DOM events
• State Reactivity: Simple reactive state management
• Client-Side Router: History-based routing with component-level hot module replacement
• jQuery Bridge: Optional integration with jQuery

Installation

npm install feedjs-runtime

Usage

Basic Rendering

import { mount } from 'feedjs-runtime';
import { createVDOM } from 'feedjs-core';

const state = {
  message: 'Hello, World!',
  items: ['Apple', 'Banana', 'Cherry']
};

const vnode = createVDOM(templateIR, state);
mount(document.getElementById('app')!, vnode, state);

Router Setup

import { createRouter } from 'feedjs-runtime';

const router = createRouter({
  root: document.getElementById('app')!,
  getState: () => window.__STATE__,
  routes: [
    { path: '/', page: () => import('./pages/home.feedjs.html') },
    { path: '/about', page: () => import('./pages/about.feedjs.html') },
    { path: '/users/:id', page: () => import('./pages/user.feedjs.html') }
  ]
});

router.start();

State Management

// Define reactive state
const state = {
  count: 0,
  increment() {
    this.count++;
    notify(); // Trigger re-render
  },
  subscribe(fn) {
    subscribers.add(fn);
  }
};

function notify() {
  subscribers.forEach(fn => fn());
}

API

mount(container: Element, vnode: VNode, state: object): void

Mounts a VNode tree to a DOM container with the given state.

createRouter(options: RouterOptions): Router

Creates a client-side router instance.

Router Options:

• root - Root DOM element for mounting pages
• getState - Function that returns the current application state
• routes - Array of route definitions

Route Definition:

interface Route {
  path: string;           // Route path (supports :param for params)
  page: () => Promise<any>;  // Function that returns a page module
}

Router Methods

• start() - Start the router and navigate to the initial path
• navigate(path: string) - Navigate to a path programmatically
• getCurrentPath() - Get the current route path

Event Binding

The runtime handles f-on:* directives automatically:

<button f-on:click="increment">Click me</button>
<input f-on:input="handleInput">
<form f-on:submit="handleSubmit">

Direct Runtime Evaluation

The evaluator function can be used to evaluate expressions at runtime:

import { evaluate } from 'feedjs-runtime';

const scope = { 
  state: { price: 100, quantity: 2 },
  locals: {} 
};

const result = evaluate('price * quantity', scope); // Returns 200

License

MIT