We will go over the process of building a starter e-commerce mobile app for searching through a books datastore using React native. If you have never worked with React Native before, this can act as a kickstart to your mobile app development journey with Javascript! 🎉 Some context first! It’s 2018 and JavaScript is growing faster than ever before. The entire community has been working hard to make the web more and more accessible. Everything starting from the libraries and frameworks, to the dev tools required to build the apps, have matured gracefully. Sure, there has been some chaos amidst these improvements. But it is just fascinating that if you know JS today, you can build a web app, a backend server and even mobile apps. React Native enables building native mobile apps using JavaScript and React. Unlike Cordova/Ionic/Phonegap that also lets you build mobile apps using JavaScript with WebViews, React Native compiles entirely to a native app and also allows writing native (Swift, Objective-C, Android) code when required. Things you need to know before getting started 👶 You should have some (if not much) experience writing React. It is fairly easy to get started with and has that can help. If you are new to the subject, you can . And, if you prefer videos over text, I highly recommend ’s free course on Egghead — . good resources available online start with the official tutorial Kent C. Dodds The Beginner’s Guide to ReactJS It’d be best if you have a fair understanding of ES6+ as well. I’ve got you covered with that. I wrote a which should put you on track in no time. 💪 kickstarter guide to writing ES6 You don’t necessarily have to spend a lot of time learning react and building web apps. . But if you quickly want to get started with React Native, get yourself familiarised with React’s basic fundamentals because React Native and React share the same core principles for building apps. They just target two different clients — web and native. (Although I’d recommend you to do that) Here, I want to highlight the fact that if you use React and React Native in production, you can end up with a lot of shared code across all the platforms (web, iOS and Android). This will enable you to maintain bigger projects with less development time and costs 😉. This is one of the reasons why React Native is starting to see industry wide adoption: Airbnb, Facebook, Instagram, Walmart, Tesla have their mobile apps built using RN. Basic Concepts 👩‍🎓 Let’s start by briefly discussing how React Native works and how the JavaScript code actually translates into a kickass native mobile app. Any React Native application runs in two threads: 1. Main thread This thread manages the user interface of your app and processes all the native interactions including gestures and touch. Since React Native also allows you to add in native code written in Android Java, Objective C or Swift, these chunks of code get executed on this thread. 2. JavaScript thread This executes the JavaScript code that you write in a separate (which is present in iOS by default and gets shipped to Android devices with the build). JavaScript engine For the application to work, these two threads need to talk to each other, which is what is for. Bridge React Native core architecture Bridge, as the name suggests, helps in the data (message) transactions between the JavaScript thread and the Main Native thread. These messages can be asynchronous or batched. Bridge enables one’s JavaScript code to talk to the native modules and interact with the device APIs. Now that we have the basic understanding of react native architecture, let’s get into the implementation details. Setting up the development environment 💻 If you already have React Native installed and are familiar with the development ecosystem, you can skip ahead to the next section . For those of you, who are just getting started, you can either (which is more detailed), or follow along with me here: follow the official setup guide here Make sure you have installed in your system. node We will be using the create-react-native-app (CRNA) tool for setting up the boilerplate. npm install -g create-react-native-app Then run the following commands to create a new React Native project, say HelloNative: create-react-native-app HelloNative

cd HelloNative
npm start This will start a development server for you, and print a QR code in your terminal. The only caveat of using here is that it may not use the latest version of react-native. If that bothers you, you can use or which are also fairly simple to get started with. create-react-native-app Expo CLI Expo XDE Next step is to install the client app on your iOS or Android phone and connect to the same wireless network as your computer. Using the Expo app, you can scan the above generated QR code from your terminal and open your project directly in your phone. How cool is that! Expo At this point, your app should look like this: React Native app If you wish to run this app on an emulator, you can run: npm run ios for iOS and, npm run android for Android emulator. This will install Expo client on the emulator and run your react-native app. If you now open the developer menu in the app, you’d see options to enable . These allow you to reload your app instantly, which is a major advantage if you come from Android development background where it takes ages for gradle to finish building. Hot Reloading and Live Reload A closer look at the developer options The developer options come bundled with debugging features as well. We will get into the details of it in the next section. Debugging and troubleshooting ⚒ Debugging Remote JS feature in the developer menu allows us to browse through any console messages or errors in the browser. This comes super handy while you’re building apps. Additionally, you may want to install while you’re at it. React Native debugger React Native Debugger in action This is a nifty tool that allows us to browse through the component state and props tree in React Native apps. It also enables you to browse and edit the styles that are being applied to the components present in your app, serving as a replacement for chrome-dev-tools here. 🔋 Batteries included React Native comes with a range of built-in components that you can use to build apps with. You can browse through the where in you will find some of these components to be platform specific — under and sections. list of available components here Android specific iOS specific These components will help you put together simple UIs for your app. Similar to web, React Native supports fetch enabling you to make http requests and get data from your server. For our 📗 booksearch app, we will be using Elasticsearch, which is a database which can search through large amounts of data in a short time. It performs a on the data which is stored in the form of documents (which are JSON objects) by examining all the words in every document. NoSQL full-text search Even if you’ve never used Elasticsearch before, you should be able to follow along with this tutorial. Elasticsearch may not seem like an easy thing to get started with. The setup, adding or viewing data and generating query can seem a bit overwhelming if you are a beginner. That’s why, we, at , have built some open-source tools to help you do all these things with the matter of some clicks 😉 Appbase Tool to into Elasticsearch — 🗃 add data Importer Tool to like an excel sheet — 👀 view Elasticsearch data Data Browser Tool to — 🔨 generate relevant Elasticsearch queries Query Builder In this blog post, with the help of some of these tooling, we will utilize the strengths of Elasticsearch ⚡️ with React Native to build a rich mobile bookstore app. You can set up and install an Elasticsearch server by following the , or you can create a free account at which provides Elasticsearch hosting as a service and is easy to use. For simplicity, we will be using appbase.io service to get started with. official installation guide appbase.io I’ve already created an appbase app with books dataset for simplicity. You can check out the dataset . over here Dataset of books You can clone this dataset and generate credentials for your very own app by clicking on the button on the bottom left. Clone this app These credentials will be used to connect our UI with this app. The credentials of the above app which we will be using in this tutorial are: {
    app: "good-books-ds",
    credentials: "nY6NNTZZ6:27b76b9f-18ea-456c-bc5e-3a5263ebc63d",
    type: "good-books-ds"
} Say hello 👋 to Reactivesearch 🔍 We will be using , an open-source React and React Native UI components library for Elasticsearch that I am a contributor to. It offers a range of highly customizable rich UI components that can connect with any Elasticsearch server and provide you an appropriate default configuration for all generic use-cases (like E-commerce, Yelp, Meetups, etc) bundled into these components. ReactiveSearch Wait, why do I need ReactiveSearch now? ReactiveSearch simplifies the entire process of connecting to an Elasticsearch index, making queries, fetching and rendering results in sleek UI, not just that, it also lets you make your components talk to each other, i.e. if Component-A gets updated, Component-B gets to know and it can update itself without needing any manual interaction. This whole component-to-component subscription comes in handy when you have dynamic filters present on your screen, such as in case of e-commerce apps where Selecting a category of Appliances, also changes the sub-categories available, their prices and what not. ReactiveSearch helps you create significantly smarter apps easily and in a declarative fashion. Reactivesearch-native bundles a range of native UI components that enables you to build UIs like Airbnb, meetups, etc seamlessly. You can find . the complete list of available components here Reactivesearch Native Components Building the 📚 BookSearch app First things first, we need to install reactivesearch-native in our React Native project by running: npm install @appbaseio/reactivesearch-native All the ReactiveSearch components are wrapped around a container component called which connects our UI components with the Elasticsearch cluster. ReactiveBase We’ll use this in App.js: <a href="https://medium.com/media/55d535313eb058b6718f539b3c1a050b/href">https://medium.com/media/55d535313eb058b6718f539b3c1a050b/href</a> Notice how we have used Flex based styling here. Styling in React Native is very much similar to that of web. If you’ve no experience using flex, I highly recommend to begin with. FlexBox Froggy Besides , we have used two other components from React Native in our code snippet: Stylesheet - This is similar to a div html element in React Native ecosystem. It is a container that supports layout with , , , and controls. View flexbox style some touch handling accessibility - This is a simple native component for displaying text. You can read more about it . Text here For our BookSearch app, we will need two components from reactivesearch-native in our layout: 1. Search box for searching the books: Here, we will use DataSearch component from reactivesearch-native. It creates a search UI component and enables us to search across one or more fields in our dataset easily. It looks like this: <DataSearch
    componentId="searchbox"
    dataField={[
        'original_title',
        'original_title.search',
        'authors',
        'authors.search',
    ]}
    placeholder="Search for books"
    autosuggest={false}
/> This component queries on the given dataField(s) in the dataset. This component goes inside the ReactiveBase component and receives all the necessary data from it so we don’t have to write Elasticsearch queries ourselves. DataSearch Notice how we have used .search fields in our dataField prop here. authors.search is a of the authors field. Elasticsearch can index the same data in different ways for different purposes, which we can use to get better search results. multi-field 2. Result List View for displaying the search results: For displaying results, we will be using ReactiveList component from reactivesearch-native. Here’s what it looks like: <ReactiveList
    componentId="results"
    dataField="original_title"
    size={7}
    showResultStats={false}
    pagination={true}
    react={{
        and: "searchbox"
    }}
    onData={(res) => (
        <View style={styles.result}>
        <Image source={{ uri: res.image }} style={styles.image} />
        <View style={styles.item}>
            <Text style={styles.title}>{res.original_title}</Text>
            <Text>{res.authors}</Text>
        </View>
        </View>
    )}
/> Here’s how its props work: dataField: orders the results using name field here. react: specifies that it should construct a query based on the current selected values of searchbox component. Every time the user changes the input value in the searchbox, a new query is fired — you don’t need to write a manual query for any of the UI components here, they are preset with a default config to meet all the generic use-cases, but if you wish, you can override it via customQuery prop. onData: accepts a function which should return a valid representing a list-item in the result list. This prop will be used to render the list of results. JSX You can read all about its prop usage . here Reactivesearch is built on top of 💯 which uses some fonts which can be included by adding: native-base async componentWillMount() {
  await Expo.Font.loadAsync({
    Roboto: require('native-base/Fonts/Roboto.ttf'),
    Roboto_medium: require('native-base/Fonts/Roboto_medium.ttf'),
    Ionicons: require('@expo/vector-icons/fonts/Ionicons.ttf'),
  });
} With these components and some styling 💅 magic, here’s what our app looks like: <a href="https://medium.com/media/06df7e2c65eaab585b9926f47476e671/href">https://medium.com/media/06df7e2c65eaab585b9926f47476e671/href</a> Voila! You‘ve a BookSearch app that runs on Android & iOS If you wish to play around with this app on the fly, 🎉 try this snack here Useful links 🌟 ReactiveSearch GitHub repo ReactiveSearch docs Hope you enjoyed this tutorial. If you have any thoughts or suggestions, please let me know and do share your version of the app in the comments 😉

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