README

An Inertia.js adapter for Yii2 framework, providing a seamless bridge between your Yii2 backend and modern JavaScript frontend frameworks (React, Vue, Svelte).

Features

🚀 Simple API: Match the developer experience of inertia-laravel
📦 Shared Props: Share data across all Inertia responses
🔄 Partial Reloads: Support for partial page updates
🎯 Asset Versioning: Automatic version management for cache busting
🧪 Well Tested: Comprehensive unit and integration tests
📚 Full Documentation: Complete usage examples and guides

Installation

Install via Composer:

composer require crenspire/yii2-inertia

Quick Start

1. Configure Your Application

In your config/web.php, register the Inertia view renderer:

'view' => [
    'renderers' => [
        'inertia' => \Crenspire\Yii2Inertia\ViewRenderer::class,
    ],
],

2. Create Root View Template

Create a root view template at views/layouts/inertia.php:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Inertia.js App</title>
    <script type="module" crossorigin src="/dist/assets/index.js"></script>
    <link rel="stylesheet" crossorigin href="/dist/assets/index.css">
</head>
<body>
    <div id="app" data-page="<?= htmlspecialchars(json_encode($page), ENT_QUOTES, 'UTF-8') ?>"></div>
</body>
</html>

3. Use in Controllers

use Crenspire\Yii2Inertia\Inertia;

class HomeController extends \yii\web\Controller
{
    public function actionIndex()
    {
        return Inertia::render('Home', [
            'title' => 'Welcome',
            'user' => Yii::$app->user->identity,
        ]);
    }
}

4. Setup Frontend

Install Inertia.js and your frontend framework:

npm install @inertiajs/inertia @inertiajs/inertia-react react react-dom

Create src/main.jsx:

import React from 'react';
import ReactDOM from 'react-dom/client';
import { createInertiaApp } from '@inertiajs/inertia-react';
import Home from './pages/Home';

createInertiaApp({
  resolve: (name) => {
    const pages = { Home };
    return pages[name];
  },
  setup({ el, App, props }) {
    ReactDOM.createRoot(el).render(<App {...props} />);
  },
});

API Reference

Inertia::render()

Render an Inertia page:

return Inertia::render('Dashboard', [
    'users' => User::find()->all(),
]);

Inertia::share()

Share data with all Inertia responses:

// Single key-value
Inertia::share('appName', 'My App');

// Multiple values
Inertia::share([
    'user' => Yii::$app->user->identity,
    'flash' => Yii::$app->session->getFlash('message'),
]);

// Using closures
Inertia::share('timestamp', function () {
    return time();
});

Inertia::version()

Set or get the asset version:

// String version
Inertia::version('1.0.0');

// Callback version
Inertia::version(function () {
    return filemtime(Yii::getAlias('@webroot/dist/manifest.json'));
});

// Get current version
$version = Inertia::version();

Inertia::location()

Create an Inertia redirect response:

return Inertia::location('/dashboard');

Global Helper

You can also use the global inertia() helper function:

return inertia('Home', ['title' => 'Welcome']);

Partial Reloads

Inertia supports partial reloads for better performance. The client can request only specific props:

// Client sends: X-Inertia-Partial-Component: Dashboard
// Client sends: X-Inertia-Partial-Data: users,stats

// Only 'users' and 'stats' props will be returned (plus shared props)
return Inertia::render('Dashboard', [
    'users' => $users,
    'stats' => $stats,
    'other' => $other, // This will be excluded
]);

Redirects

For POST/PUT/PATCH/DELETE requests, Inertia handles redirects automatically:

public function actionStore()
{
    // ... save data
    
    // For Inertia requests, returns 409 with X-Inertia-Location header
    // For regular requests, returns 302 redirect
    return Inertia::location('/dashboard');
}

The Inertia::location() method automatically detects the request type:

Inertia requests: Returns HTTP 409 with X-Inertia-Location header
Regular requests: Returns HTTP 302 with Location header

Version Management

Inertia.js uses version checking to ensure the frontend and backend stay in sync. When the client's version doesn't match the server's version, a full page reload is triggered.

Automatic Version Detection

By default, the version is automatically detected from your manifest.json file:

// Automatically uses dist/manifest.json mtime if it exists
$version = Inertia::version();

Custom Version

You can set a custom version:

// String version
Inertia::version('1.0.0');

// Callback version (evaluated on each request)
Inertia::version(function () {
    return filemtime(Yii::getAlias('@webroot/dist/manifest.json'));
});

Version Mismatch Handling

When a client sends an X-Inertia-Version header that doesn't match the current version, the adapter automatically returns a location redirect (409 status) to trigger a full page reload. This ensures users always have the latest assets.

Configuration

Root View Path

You can configure the root view path:

Inertia::setRootView('@app/views/custom-inertia.php');

Bootstrap/Initialization

For shared props that should be available on every page, you can set them in your application bootstrap or a common controller:

// In config/bootstrap.php or a base controller
use Crenspire\Yii2Inertia\Inertia;

// Share user data
Inertia::share('user', function () {
    return Yii::$app->user->identity;
});

// Share flash messages
Inertia::share('flash', function () {
    return [
        'success' => Yii::$app->session->getFlash('success'),
        'error' => Yii::$app->session->getFlash('error'),
    ];
});

Troubleshooting

Version Mismatch Issues

If you're experiencing frequent full page reloads, check:

Your version callback is returning a stable value
The manifest.json file exists and is accessible
File permissions allow reading the manifest file

Redirect Not Working

If redirects aren't working as expected:

Ensure you're using Inertia::location() instead of Yii's redirect()
Check that the request has the X-Inertia header for Inertia requests
Verify the response status code (409 for Inertia, 302 for regular)

Root View Not Found

If you get "Root view file not found" errors:

Verify the path in Inertia::setRootView() is correct
Check that the view file exists and is readable
Ensure Yii aliases are properly configured

Running the Example

The repository includes a complete example application. To run it:

# Install dependencies
cd examples/basic
composer install

# Install frontend dependencies
cd vite
npm install

# Build frontend assets
npm run build

# Or run dev server
npm run dev

# Start PHP server
cd ../web
php -S localhost:8000

Visit http://localhost:8000 in your browser.

Testing

Run the test suite:

composer install
vendor/bin/phpunit

Requirements

PHP ^8.1
Yii2 ~2.0.50

License

MIT License. See LICENSE file for details.

Contributing

Please see CONTRIBUTING.md for details.

Changelog

See CHANGELOG.md for a list of changes.

crenspire / yii2-inertia

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