Build Luigi App with React

In this step, you will create a file with information about the products on sale in your shopping app.

In a real life implementation, this data would be provided by a database. But for simplicity, you will create dummy data in a .json file. This file will be used both by the main app and the micro-frontends.

Navigate to ui5-mf/uimodule/webapp/model and create a products.json file with the following content:

{
	"ProductCollection": [{
			"id": 101,
			"name": "Logitech Mouse",
			"price": 45.0,
			"stock": 80,
			"icon": "product",
			"currencyCode": "EUR",
			"orderQuantity": 2,
			"description": "LIGHTSPEED Wireless Gaming Mouse with HERO Sensor"
		},
		{
			"id": 102,
			"name": "Logitech Keyboard",
			"price": 50.0,
			"stock": 22,
			"icon": "product",
			"currencyCode": "EUR",
			"orderQuantity": 1,
			"description": "A physical keyboard that uses an individual spring and switch for each key. Today, only premium keyboards are built with key switches; however, they were also used in the past, such as in the Model M keyboard from IBM, which used buckling spring switches"
		},
		{
			"id": 103,
			"name": "HP Optical Mouse",
			"price": 35.0,
			"stock": 4,
			"icon": "product",
			"currencyCode": "EUR",
			"orderQuantity": 2,
			"description": "Utilizing the latest optical sensing technology, the HP USB Optical Scroll Mouse records precise motion."
		},
		{
			"id": 104,
			"name": "MacBook Pro",
			"price": 1299.0,
			"stock": 11,
			"icon": "laptop",
			"currencyCode": "EUR",
			"orderQuantity": 3,
			"description": "It features a touch-sensitive OLED display strip located in place of the function keys, a Touch ID sensor integrated with the power button, a butterfly mechanism keyboard similar to the MacBook, and four USB-C ports that also serve as Thunderbolt 3 ports."
		},
		{
			"id": 105,
			"name": "Magic Mouse",
			"price": 40.0,
			"stock": 20,
			"icon": "product",
			"currencyCode": "EUR",
			"orderQuantity": 6,
			"description": "The Magic Mouse 2 (Apple Magic Mouse 2), is a computer mouse developed and released by Apple Inc. It features a multi-touch acrylic surface for scrolling. ... The mouse features a lithium-ion rechargeable battery and Lightning connector for charging and pairing."
		},
		{
			"id": 106,
			"name": "Brother Printer",
			"price": 235.0,
			"stock": 24,
			"icon": "fx",
			"currencyCode": "EUR",
			"orderQuantity": 1,
			"description": "Our affordable, quality machines provide you with the optimal way to take care of all your printing needs. Shop for the right printer, all-in-one, or fax machine for your home or home office today."
		},
		{
			"id": 107,
			"name": "iPhone 11",
			"price": 835.0,
			"stock": 45,
			"icon": "iphone",
			"currencyCode": "EUR",
			"orderQuantity": 8,
			"description": "The iPhone 11 dimensions are 150.9mm x 75.7mm x 8.3mm (H x W x D). It weighs about 194 grams (6.84 ounces).It features a 6.1-inch all-screen LCD display and is powered by Apple new A13 bionic chip with Third-Generation Neural Engine."
		},
		{
			"id": 108,
			"name": "Google Pixel 3a",
			"price": 299.0,
			"stock": 54,
			"icon": "desktop-mobile",
			"currencyCode": "EUR",
			"orderQuantity": 7,
			"description": "At 5.6 inches, the Google Pixel 3a display is proportionate to the relatively small body of the phone – that is to say, it is rather small. The display is Full HD+ and OLED, with a resolution of 2220 x 1080, and because of the relatively small screen size the pixels per inch count is rather high at 441."
		},
		{
			"id": 109,
			"name": "PlayStation 4",
			"price": 330.0,
			"stock": 94,
			"icon": "video",
			"currencyCode": "EUR",
			"orderQuantity": 1,
			"description": "PS4 is the fourth home video game console produced by Sony Computer Entertainment and is compatible with the PlayStation 3. It was officially announced at a press conference on February 20, 2013 and launched on November 15, 2013."
		},
		{
			"id": 110,
			"name": "Dell Monitor",
			"price": 630.0,
			"stock": 20,
			"icon": "sys-monitor",
			"currencyCode": "EUR",
			"orderQuantity": 3,
			"description": "34'' U3419W Monitor, Display with stand Height adjustable (115 mm), tiltable (-5° to 21°), rotatable (-30° to 30°) Security slot (cable lock sold separately), anti-theft slot for locking to stand (for display). Includes: DisplayPort cable, HDMI cable, Power cable, Stand, USB 3.0 Type-A to Type-B cable, USB-C cable"
		}
	]
}

This step prepares you for development. In order to be able to use webpack and gain full control over your React app, you need to trigger the npm run eject command.

1. Navigate to the core app:

   cd react-core-mf
   

2. Trigger eject command. Note that due to the way this command works, it is possible the npm run eject fails. If you get an error, you need to commit any changes before running the command. More information can be found here.

   npm run eject
   

In this step, you will let Luigi take control of the index.hmtl file - the entry point for your app.

Go to react-core-mf/public/index.html and change its content to:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Luigi</title>
  <link rel="stylesheet" href="/luigi-core/luigi.css" />
</head>
<body>
<script src="/luigi-core/luigi.js"></script>
<script src="/luigi-config.js"></script>
</body>
</html>

In this step, you will create another HTML file which will serve as a template for React to create the React micro-frontends.

Go to react-core-mf/public and create a new file called app.html. Paste this code into the file:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>React App</title>
  </head>
  <body>
    <div id="root"></div>
  </body>
</html>

In this step, we configure webpack and adjust dependencies in order to make it easier to develop and build the app.

1. Go to react-core-mf/config/webpack-config.js

2. Around line 27, next to the other similar entries, add:

   const CopyWebpackPlugin = require('copy-webpack-plugin');
   

3. Remove the following line from the file:

   const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
   

   In the second occurrence, remove the whole entry as well:

   new ModuleScopePlugin(paths.appSrc, [
     paths.appPackageJson,
     reactRefreshOverlayEntry,
   ]),
   

4. Find the plugins section around line 510. Replace its content with:

   new CopyWebpackPlugin(
      {
       patterns: [
          {
            context: 'public',
            from: 'index.html',
            to: 'index.html'
          },
          {
            from: 'node_modules/@luigi-project/core',
            to: './luigi-core'
          }
        ]
      },
      {
        ignore: ['.gitkeep', '**/.DS_Store', '**/Thumbs.db'],
        debug: 'warning'
      }
    ),
    new HtmlWebpackPlugin(
        {
          inject: true,
          template: __dirname + '/../public/app.html',
          filename: 'app.html'
        }
    ),
   

With the help of simple parameters pertaining to navigation and general settings, you will create your first “Home” navigation node and make your application responsive.

These are the Luigi navigation parameters you will use:

• pathSegment - text segment added to the URL
• label - the name of the node displayed in the navigation
• icon - a SAP icon shown next to the label
• viewUrl- the URL of your micro-frontend

1. Copy and paste this to luigi-config.js:

   Luigi.setConfig({
     navigation: {
       nodes: () => [
         {
           pathSegment: 'home',
           label: 'Home',
           icon: 'home',
           viewUrl: '/app.html#/home'
         }
       ]
     },
   

2. Add a Luigi settings: section directly below. Using the code below, you will configure a header for your page and make your app look better on mobile devices using the responsiveNavigation parameter:

   settings: {
     header: {
       title: 'Luigi Application',
       logo: '/logo.png'
     },
     responsiveNavigation: 'simpleMobileOnly'
   }
   

In this step, you will create your first micro-frontend (a.k.a. view) with React. It is a simple “Home” view with a welcome message.

1. Navigate to react-core-mf/src and create a folder called views.

2. Create a Home.jsx file in views with the following content:

   import React from 'react';
   import { LayoutPanel } from 'fundamental-react';
   
   export const Home = () => {
      return (
          <LayoutPanel>
              <LayoutPanel.Body>
                  <h2>Welcome to Luigi - a micro-frontend framework</h2>
              </LayoutPanel.Body>
          </LayoutPanel>
      );
   }
   

In this step, you will make changes to the entry point index.js for the React app. You will configure the router for the “Home” view created in the previous step, and import Luigi Client.

Open react-core-mf/src/index.js and change its content to:

import React, { Component } from 'react';
import { render } from 'react-dom';
import { addInitListener } from '@luigi-project/client';
import { BrowserRouter as Router, Route } from 'react-router-dom';
import { Home } from './views/Home.jsx';
import './index.css';

class App extends Component {
 constructor(props) {
   super(props);
   addInitListener(() => {
     console.log('Luigi Client initialized.');
   });
 }
 render() {
   return (
     <Router basename={`/app.html#`}>
       <Route path="/home" component={Home} />
     </Router>
   );
 }
}

render(<App />, document.getElementById('root'));

In this step, you will create more React micro-frontends including a product list and product details.

1. Navigate to react-core-mf/src/viewsand create a file List.jsx with the following content:

   import React from 'react';
   import { MessageStrip, Avatar, LayoutPanel, LayoutGrid } from 'fundamental-react';
   
   const NO_AVAILABLE_PRODUCT_MSG = 'Unfortunately, there is no available product at this moment.';
   const panelStyle = { cursor: 'pointer' };
   
   export const List = ({ items }) => (
      (items.length === 0) ? <MessageStrip type='error'>{NO_AVAILABLE_PRODUCT_MSG}</MessageStrip>
      : items.map(({id, name, price, icon, stock}) => {
          return (
               <LayoutPanel key={id} style={panelStyle}>
                   <LayoutPanel.Header>
                       <LayoutPanel.Head  title={name} />
                   </LayoutPanel.Header>
                   <LayoutPanel.Body>
                       <LayoutGrid cols={2}>
                           <div>
                               <div>Price: &euro;{price}</div>
                               <div>Stocks: {stock}</div>
                           </div>
                           <div><Avatar circle glyph={icon} size='s' /></div>
                       </LayoutGrid>
                   </LayoutPanel.Body>
               </LayoutPanel>
          )
      })
   );
   
   

2. Create a file named Products.jsx in the same folder:

   import React from 'react';
   import { List } from './List.jsx';
   import { ProductCollection } from '../../../ui5-mf/uimodule/webapp/model/products.json';
   import { LayoutPanel, LayoutGrid } from 'fundamental-react';
   
   export const Products = () => (
      <section className="fd-section">
          <LayoutPanel>
              <LayoutPanel.Header>
                  <h3>Items ({ProductCollection.length})</h3>
              </LayoutPanel.Header>
              <LayoutPanel.Body>
                  <LayoutGrid cols={2}>
                      <List items={ProductCollection} />
                  </LayoutGrid>
              </LayoutPanel.Body>
          </LayoutPanel>
      </section>
   );
   
   export default Products;
   

3. Create a ProductDetail.jsx file in the same folder:

   import React, { useState, useEffect } from 'react';
   import { ProductCollection } from '../../../ui5-mf/uimodule/webapp/model/products.json';
   import { LayoutPanel, MessageStrip } from 'fundamental-react';
   
   const NO_MATCH_PRODUCT_MSG = 'This product is not available. Please check again.';
   
   export const ProductDetail = ({ match }) => {
    const itemId = parseInt(match.params.id);
    const [item, setItem] = useState(null);
   
    useEffect(()=> {
        setItem(ProductCollection.find(product => product.id === itemId));
    }, [itemId]);
   
    const renderDetails = () => (
      <LayoutPanel>
          <LayoutPanel.Header>
              <h1 className="fd-section__title">{item.name}</h1>
          </LayoutPanel.Header>
          <LayoutPanel.Filters>
              <div>Price: &euro;{ item.price }</div>
              <div>Stocks: { item.stock }</div>
          </LayoutPanel.Filters>
          <LayoutPanel.Body>
              <p>{ item.description }</p>
          </LayoutPanel.Body>
      </LayoutPanel>
    );
   
    return (
      <section className="fd-section">
        {item
          ? renderDetails()
          : <MessageStrip type='error'>{ NO_MATCH_PRODUCT_MSG }</MessageStrip>
        }
      </section>
    );
   };
   

In this step, you will add a navigation node in Luigi for the “Products” micro-frontend.

1. Open react-core-mf/public/luigi-config.js

2. Add a new “Products” node to your navigation:

   navigation: {
     nodes: () => [
       {
         pathSegment: 'home',
         label: 'Home',
         icon: 'home',
         viewUrl: '/app.html#/home',
         children: [{
           pathSegment: 'products',
           label: 'Products',
           icon: 'list',
           viewUrl: '/app.html#/products'
         }]
       }
     ]
   }
   

In this step, you will add the ProductDetail.jsx view to the app. You will be able to show details for each product via a Luigi dynamic parameter, in this case named :id.

1. Open react-core-mf/src/index.js and add:

   import { ProductDetail } from './views/ProductDetail.jsx';
   

2. Add the following route paths to the <Router> section:

   <Route path="/products" component={Products} />
   <Route path='/productDetail/:id' component={ProductDetail} />
   

3. In luigi-config.js, add a child node :id to Products:

   pathSegment: 'products',
   label: 'Products',
   icon: 'list',
   viewUrl: '/app.html#/products',
   keepSelectedForChildren: true,
   children: [{
       pathSegment: ':id',
       viewUrl: '/app.html#/productDetail/:id'
   }]
   

Instead of using React, in this step we we will use Luigi to provide routing on the micro-frontend side. Luigi Client’s linkManager function is the simplest way to navigate to the id page for each product.

1. Open react-core-mf/src/views/List.jsx

2. Import link manager from Luigi Client:

   import { linkManager } from '@luigi-project/client';
   

3. Copy and paste this into the List.jsx file:

   const navigateToDetail = (id) => {
      linkManager().navigate('/home/products/' + id);
   }
   

4. Add onClick event at the LayoutPanel component:

   <LayoutPanel key={id} style={panelStyle} onClick={()=>navigateToDetail(id)}>