In the following example, you will fetch data from an remote API and store it in your component's state. ), Weil ich auf Deutsch schon Verständnisprobleme habe, versuche ich es gar nicht erst auf Englisch, ich hoffe, das ist okay. Since most server applications are stateless, in order to scale them horizontally with multiple server…. Learn about React concepts, helpful libraries or get tips & tricks for deploying your app and many more topics. Let's add this behavior in the next step: Now, the State Hook uses either the initial value from the local storage or an empty string as default. After the successful installation of create-react-app, we can create our first react application using it. Your email address will not be published. Because of the installation NOT in the root directory I just had to add the “homepage”: “.”, line into the package.json file. This process is lot… Ich habe einfach die Standard App, die bei “create-react-app” generiert wird, versucht zu builden. Browser generally caches JS files and return the same file from previous request if the name is not changed. create-react-app also uses Babel and Webpack behind the scenes. In this post, we detail how to use the create-react-app project along with an API server.. Update (8/3/2016): We now have a mirror for this post that uses Rails. For instance, this behavior can be useful when you deal with an user session after a user logged in into your application. Thank you very much! If you like it, make sure to star it. In your JavaScript code, running in the browser, you should have access to the localStorage instance which has setter and getter to store and retrieve data from the local storage. In the next step, you can add only a few lines to enable caching for your React application: There shouldn't be a request to the API made twice for the same search term, because the result should be cached in the local storage. You should see the same value as before. If I run inde.html local (just in browser), it does not work. Afterward, we will use the local storage as cache every time we do another search request. After that, your index.html refers to those Javascript and CSS files like any other static . noch eine CSS habe? To get a bundled version of your app, you can use build tools like Webpack or Parcel. Prerequisites. Wenn ich jetzt in dem Build Ordner die index.html öffne, habe ich eine leere Seite, und wenn ich in den Entwickleroptionen von Chrome gucke, wird da auch nur die HTML geladen, nicht das Javascript. Since the result from the API is a complex JavaScript object, and not only a primitive String, it needs to be stringified when stored and parsed when retrieved from the storage. Once you close the browser and open the JavaScript application again, you will find the data still in the local storage. No installation with “serve” as explained on was necessary. Enter create-react-app, the tool recently released by Facebook's engineering team that allows you to spin up a brand new React application in just a few seconds. For example if I run a simple static-server or a http app works perfectly fine from localhost, just the create-react-app doesn't work sometimes. Hint: You can also use the React Native CLI to generate and run a Release build (e.g. But that won’t work in production. The former is used for browser compatibility and the latter is used for cross domain synchronization of local storages. Check out that post if Rails is your preferred API server platform.. Update (8/25/2016): react-scripts version 0.2.3 was released, adding a proxy feature for the Webpack development server to address CORS issues in development. It has been fixed on my machine after a few restarts, but now seems to not being able to fix at all. By building and bundling your app, the build tool bundles and minifies all your dependencies, javascript code and even CSS to a bunch of separate files. In case you face any issues, feel free to add them in the comments below. Sometimes you want to cache/persist data only in your current browser session. Funny Story, NPM Doesn’t Provide an Immediately Obvious Way to Run Multiple Scripts at Once. If there are cachedHits in the localStorage instance, the cached result is set as state and no API request is performed. Since you’ve already bundled everything together, there is no need to import any npm modules anymore – that’s one reason why you can just serve your app as a static web site. There is no backend and no additional library needed. If you don’t experience the problems described above or don’t feel comfortable using JavaScript tools yet, consider adding React as a plain