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 an external service/API. But for simplicity, you will create a .json file containing dummy data. This file will provide the displayed data in the micro-frontend.

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

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   {
     "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"
       }
     ]
   }
   

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

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

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   <!DOCTYPE html>
   <html>
     <head>
       <title>Luigi</title>
       <meta
         name="viewport"
         content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1"
       />
       <link rel="stylesheet" href="/luigi-core/luigi.css" />
     </head>
   
     <body>
       <noscript>You need to enable JavaScript to run this app.</noscript>
       <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.

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

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     <!DOCTYPE html>
     <html lang="en">
       <head>
         <meta charset="utf-8" />
         <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
         <meta name="viewport" content="width=device-width, initial-scale=1" />
         <title>React App</title>
       </head>
       <body>
         <noscript>You need to enable JavaScript to run this app.</noscript>
         <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. Find the following line from the file and comment it out by surrounding it with /* or // tags:

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     // Around line 19
     // const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
   

3. In the second occurrence, comment out this whole entry as well:

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     //Around line 348
     /*
         new ModuleScopePlugin(paths.appSrc, [
           paths.appPackageJson,
           reactRefreshOverlayEntry,
         ]),*/
   

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. Delete the folder react-core-mf/src/luigi-config. (This step is not required.)

2. Go to the file react-core-mf/public/luigi-config.js. This is where you can find the Luigi configuration. Copy and paste this code:

   JavaScript

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   !(function (e) {
     var t = {};
     function n(r) {
       if (t[r]) return t[r].exports;
       var o = (t[r] = { i: r, l: !1, exports: {} });
       return e[r].call(o.exports, o, o.exports, n), (o.l = !0), o.exports;
     }
     (n.m = e),
       (n.c = t),
       (n.d = function (e, t, r) {
         n.o(e, t) || Object.defineProperty(e, t, { enumerable: !0, get: r });
       }),
       (n.r = function (e) {
         "undefined" != typeof Symbol &&
           Symbol.toStringTag &&
           Object.defineProperty(e, Symbol.toStringTag, { value: "Module" }),
           Object.defineProperty(e, "__esModule", { value: !0 });
       }),
       (n.t = function (e, t) {
         if ((1 & t && (e = n(e)), 8 & t)) return e;
         if (4 & t && "object" == typeof e && e && e.__esModule) return e;
         var r = Object.create(null);
         if (
           (n.r(r),
           Object.defineProperty(r, "default", { enumerable: !0, value: e }),
           2 & t && "string" != typeof e)
         )
           for (var o in e)
             n.d(
               r,
               o,
               function (t) {
                 return e[t];
               }.bind(null, o)
             );
         return r;
       }),
       (n.n = function (e) {
         var t =
           e && e.__esModule
             ? function () {
                 return e.default;
               }
             : function () {
                 return e;
               };
         return n.d(t, "a", t), t;
       }),
       (n.o = function (e, t) {
         return Object.prototype.hasOwnProperty.call(e, t);
       }),
       (n.p = ""),
       n((n.s = 0));
   })([
     function (e, t) {
       Luigi.setConfig({
         navigation: {
           nodes: () => [
             {
               pathSegment: "home",
               label: "Home",
               icon: "home",
               viewUrl: "/sampleapp.html#/home",
             },
           ],
         },
         settings: {
           header: { title: "Luigi React App", logo: "/logo192.png" },
           responsiveNavigation: "simpleMobileOnly",
           customTranslationImplementation: myTranslationProvider,
         },
         lifecycleHooks: {
           luigiAfterInit: () => {
             Luigi.i18n().setCurrentLocale(defaultLocale);
           },
         },
         communication: {
           customMessagesListeners: {
             "set-language": (msg) => {
               Luigi.i18n().setCurrentLocale(msg.locale);
             },
           },
         },
       });
     },
   ]);
   
   var defaultLocale = "en-US";
   function myTranslationProvider() {
     var dict = {
       "en-US": { PRODUCTS: "Products", ORDERHISTORY: "Order History" },
     };
     return {
       getTranslation: function (label, interpolation, locale) {
         return (
           dict[locale || Luigi.i18n().getCurrentLocale() || defaultLocale][
             label
           ] || label
         );
       },
     };
   }
   

In this step, you will make changes to the entry point index.js for the React app. You will create a new view called home.js in react-core-mf/src/views, configure the router for this view, and import the Luigi Client. You will also create a file called language.js which will be useful for the next tutorials dealing with localization.

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

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   import React, { Component } from "react";
   import { render } from "react-dom";
   import { BrowserRouter, Route } from "react-router-dom";
   import Home from "./views/home.js";
   import { addInitListener, addContextUpdateListener, uxManager} from "@luigi-project/client";
   import { dict } from "./language.js";
   import "./index.css";
   
   class App extends Component {
     constructor(props) {
       super(props);
       this.state = { currentLocale: "en-US" };
       const updateCurrentLanguage = () => {
         this.setState({
           currentLocale: uxManager().getCurrentLocale(),
         });
       };
   
       addInitListener(() => {
         console.log("Luigi Client initialized.");
         updateCurrentLanguage();
       });
   
       addContextUpdateListener(() => {
         updateCurrentLanguage();
       });
     }
   
     render() {
       return (
         <BrowserRouter basename={`sampleapp.html#`}>
           <Route path="/home" render={(props) => (<Home {...props} localeDict={dict[this.state.currentLocale]} currentLocale={this.state.currentLocale}/>)}/>
         </BrowserRouter>
       );
     }
   }
   
   render(<App />, document.getElementById("root"));
   

2. Next, go to the react-core-mf/src/views directory created in step 6 of the previous tutorial. Create a file called home.js and paste the following code into it:

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   import React, { Component, useState } from "react";
   import "../../node_modules/fundamental-styles/dist/fundamental-styles.css";
   import {addInitListener, addContextUpdateListener,removeContextUpdateListener,removeInitListener,sendCustomMessage} from "@luigi-project/client";
   import {Grid, Panel,Select,Option} from "@ui5/webcomponents-react";
   
   export default class Home extends Component {
     constructor(props) {
       super(props);
       this.locale = null;
       this.initListener = null;
       this.contextUpdateListener = null;
       this.locale = props.currentLocale;
       this.setLocale = null;
       this.options = [{ key: "en-US", text: "en-US" }];
     }
   
     componentDidMount() {
       this.initListener = addInitListener((initialContext) => {
         this.setState({
           message: "Luigi Client initialized.",
         });
       });
   
       this.contextUpdateListener = addContextUpdateListener(
         (updatedContext) => {
           this.setState({
             message: "Luigi Client updated.",
           });
         }
       );
     }
   
     componentWillUnmount() {
       removeContextUpdateListener(this.contextUpdateListener);
       removeInitListener(this.initListener);
     }
   
     onChangeValue(event) {
       this.locale = event.detail.selectedOption.innerText;
       sendCustomMessage({
         id: "set-language",
         locale: event.detail.selectedOption.innerText,
       });
     }
   
     render() {
       return (
         <Grid position="Center" defaultIndent="XL1 L1 M1 S1" defaultSpan="XL10 L10 M10 S10">
           <Panel headerText={this.props.localeDict.WELCOME_LUIGI} headerLevel="H3">
             <Select onChange={this.onChangeValue}>
               {this.options.map((language) => (
                 <Option key={language.key}>{language.text}</Option>
               ))}
             </Select>
           </Panel>
         </Grid>
       );
     }
   }
   

3. Create a new file in react-core-mf/src/ called language.js with following content:

   JavaScript

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   export const dict = {
     "en-US": {
       ITEMS: "Products",
       STOCKS: "Stocks",
       SELECTLANGUAGE: "Please select a language",
       PRICE: "Price",
       WELCOME_LUIGI: "Welcome to Luigi - a micro-frontend framework",
       DESCRIPTION: "Description",
       PRODUCTADDED: "Product has been added to cart",
       AVAILABLE: "Available",
       AVAILABLEQUANT: "Available quantity: ",
       ADDTOCART: "Add to cart",
       BACK: "Back",
       OUTOFSTOCK: "Out of stock",
     },
   };
   

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:

   JavaScript

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   navigation: {
       nodes: () => [
         {
           pathSegment: "home",
           label: "Home",
           icon: "home",
           viewUrl: "/sampleapp.html#/home",
           //ADD THIS SECTION TO THE CONFIG FILE
           children: [
             {
               pathSegment: "products",
               label: "Products",
               icon: "product",
               viewUrl: "/sampleapp.html#/products",
             }
           ],
           //UNTIL HERE
         },
       ],
     },
   

3. Next, create the products.js file in react-core-mf/src/views and past following code into it:

   JavaScript

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   import React, { Component } from "react";
   import "../../node_modules/fundamental-styles/dist/fundamental-styles.css";
   import { ProductCollection } from "../../../ui5-mf/uimodule/webapp/model/products.json";
   import { Grid, List, StandardListItem } from "@ui5/webcomponents-react";
   import { linkManager } from "@luigi-project/client";
   import "@ui5/webcomponents-icons/dist/AllIcons.js";
   
   export default class Product extends Component {
     constructor(props) {
       super(props);
       this.toast = React.createRef();
     }
   
     render() {
       const handleItemClick = (event) => {
         linkManager().withParams({ root: "products" });
         linkManager().navigate(
           "/home/products/" + event.detail.item.id.toString()
         );
       };
   
       const listItems = [];
       ProductCollection.forEach((product) => {
         listItems.push(
           <StandardListItem id={product.id} key={product.id} additionalText={product.price + " " + product.currencyCode} additionalTextState="Information" description={product.description} growing="None" headerText={product.orderQuantity} icon={product.icon} type="Active" mode="None" onItemClick={() => handleItemClick(product.id)}>
             <p onClick={() => handleChildClick(product.id)}>{product.name}</p>
           </StandardListItem>
         );
       });
   
       return (
         <Grid position="Center"  defaultIndent="XL1 L1 M1 S1" defaultSpan="XL10 L10 M10 S10">
           <List headerText={this.props.localeDict.ITEMS + ": " + ProductCollection.length} onItemClick={handleItemClick}>
             {listItems}
           </List>
         </Grid>
       );
     }
   }
   

4. Add the routing module to the index.js by adding the following lines to the file:

   JavaScript

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   //AROUND LINE 4 PASTE THIS LINE:
   import Products from "./views/products.js";
   
   //AROUND LINE 35 PASTE THIS LINE:
   <BrowserRouter basename={`sampleapp.html#`}>
       <Route path="/home" render={(props) => <Home {...props} localeDict={dict[this.state.currentLocale]} currentLocale={this.state.currentLocale} />} />
     //THIS LINE HAS TO BE ADDED:
       <Route path="/products" render={(props) => <Products {...props} localeDict={dict[this.state.currentLocale]} />} />
   </BrowserRouter>
   

In this step, you will add the ProductDetail.js 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. In react-core-mf/public/luigi-config.js add a child node :id to the products node:

   js

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         children: [
                     {
                         pathSegment: "products",
                         label: "Products",
                         icon: "product",
                         viewUrl: "/sampleapp.html#/products",
                         // PASTE THIS SECTION
                         keepSelectedForChildren: true,
                         children: [{
                             pathSegment: ':id',
                             viewUrl: '/sampleapp.html#/productDetail/:id',
                             context: { id: ':id' }
                         }]
                         //UNTIL HERE
                     },
   

2. Next create a new file in react-core-mf/src/views named productDetail.js and paste following content into it:

   js

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   import React, { Component, useRef, useState } from "react";
   import "../../node_modules/fundamental-styles/dist/fundamental-styles.css";
   import { ProductCollection } from "../../../ui5-mf/uimodule/webapp/model/products.json";
   import { Grid,ObjectPage,Label,DynamicPageHeader,DynamicPageTitle,ObjectStatus,FlexBox,Button,Toast,ObjectPageSection,FormItem,Form,Text,ObjectPageSubSection,Bar } from "@ui5/webcomponents-react";
   import { linkManager } from "@luigi-project/client";
   import "@ui5/webcomponents-icons/dist/AllIcons.js";
   import { render } from "react-dom";
   
   export default class ProductDetail extends Component {
     constructor(props) {
       super(props);
       this.toast = React.createRef();
     }
   
     render() {
       const id = linkManager().currentContext.context.id;
       let product = ProductCollection.find(
         (product) => product.id.toString() === id
       );
   
       if (!product) {
         product = ProductCollection[0];
       }
   
       const showToast = () => {
         this.toast.current.show();
       };
   
       const navBack = () => {
         if (linkManager().hasBack()) {
           linkManager().goBack();
         } else {
           linkManager().navigate("/home/products");
         }
       };
   
       const icon = () => {
         return (
           <ui5-icon
             class="samples-margin"
             name={product.icon}
             style={{ width: "3rem", height: "3rem" }}
           ></ui5-icon>
         );
       };
   
       let availability = {
         state: "Warning",
         text: this.props.localeDict.OUTOFSTOCK,
       };
   
       if (product.stock) {
         availability.state = "Success";
         availability.text = this.props.localeDict.AVAILABLE;
       }
   
       return (
         <Grid position="Center" defaultIndent="XL1 L1 M1 S1" defaultSpan="XL10 L10 M10 S10">
           <ObjectPage
             headerContent={
               <DynamicPageHeader>
                 <FlexBox alignItems="Center" wrap="Wrap">
                   <FlexBox direction="Column" style={{ padding: "10px" }}>
                     <Label>
                       {this.props.localeDict.AVAILABLEQUANT +
                         product.stock}
                     </Label>
                   </FlexBox>
                 </FlexBox>
               </DynamicPageHeader>
             }
             footer={
               <Bar design="FloatingFooter"
                 endContent={
                   <>
                     <Button design="Emphasized" onClick={showToast}>
                       {this.props.localeDict.ADDTOCART}
                     </Button>
                     <Button design="Default" onClick={navBack}>
                       {this.props.localeDict.BACK}
                     </Button>
                   </>
                 }
               />
             }
             headerContentPinnable
             headerTitle={
               <DynamicPageTitle
                 actions={
                   <>
                     <Toast ref={this.toast}>
                       {this.props.localeDict.PRODUCTADDED}
                     </Toast>
                     <Button design="Emphasized" onClick={showToast}>
                       {this.props.localeDict.ADDTOCART}
                     </Button>
                     <Button onClick={navBack}>
                       {this.props.localeDict.BACK}
                     </Button>
                   </>
                 }
                 header={product.name}
               >
                 <ObjectStatus state={availability.state}>
                   {availability.text}
                 </ObjectStatus>
               </DynamicPageTitle>
             }
             image={icon()}
             imageShapeCircle
             onSelectedSectionChange={function noRefCheck() {}}
             onSelectedSectionChanged={null}
             selectedSectionId="details"
             showHideHeaderButton
             style={{
               height: "700px",
             }}
           >
             <ObjectPageSection aria-label="Details" id="details" titleText="Details">
               <ObjectPageSubSection aria-label="Details" id="details-subsection" titleText="Details">
                 <Form columnsL={2} columnsM={2} columnsXL={3} labelSpanL={1} labelSpanM={1} labelSpanXL={1}>
                   <FormItem label="Name">
                     <Text>{product.name}</Text>
                   </FormItem>
                   <FormItem label={this.props.localeDict.DESCRIPTION}>
                     <Text>{product.description}</Text>
                   </FormItem>
                   <FormItem label={this.props.localeDict.PRICE}>
                     <Text>
                       {product.price + " " + product.currencyCode}
                     </Text>
                   </FormItem>
                 </Form>
               </ObjectPageSubSection>
             </ObjectPageSection>
           </ObjectPage>
         </Grid>
       );
     }
   }
   

3. Add the route configuration to the index.js by pasting below code into it:

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     //PASTE THIS AROUND LINE 5
       import ProductDetail from './views/productDetail';
     //PASTE THE MENTIONED LINE AROUND LINE 39
       <BrowserRouter basename={`sampleapp.html#`}>
         <Route path="/home" render={(props) => <Home {...props} localeDict={dict[this.state.currentLocale]} currentLocale={this.state.currentLocale} />} />
         <Route path="/products" render={(props) => <Products {...props} localeDict={dict[this.state.currentLocale]} />} />
         //THIS LINE HAS TO BE ADDED:
         <Route path="/productDetail/:id" render={(props) => <ProductDetail {...props} localeDict={dict[this.state.currentLocale]} />} />
     </BrowserRouter>
   

In this step, you can check if your core app is configured correctly so far by running it locally.

1. Open a terminal/command prompt window. Navigate to the react-core-mf folder.

2. Input npm start. Your application should be up and running at http://localhost:3000/. You should be able to see the homepage and “Products” view. You can also navigate toward the ProductDetail view via “Products”.