In the world of web development, we can list two main design patterns for the web apps: multi-page application MPA and single-page application SPA.

In this blog post, I will focus on the integration of react library into a multi page app. I will go through the steps of the project creation and setup. This tutorial assumes that you have installed Node with npm:. Now we want to prepare the structure of our project, as below:. To speed up this process, we can execute this command:. Alright, so what we see in the pages directory is a bunch of js and html files with the same filename.

Multi Page Application with React

This filename is a cue for webpack to link the appropriate js file to html file. For example, for pair index. Second, in index. Lastly, edit index. Before this is done, we need to set up some tools, like a bundler and development server, which will help us do this.

Multiple Angular Apps on a Single Page: A Walkthrough

Install dependencies. For the project, we will install webpack module bundler, webpack-cli to use webpack in the command line i. But before we run any of these script we need to edit and setup webpack. Webpack configuration. First of all, we want to define entry point by configuring the entry property in webpack. We want to tell Webpack to use exactly one entry point for each page. This is possible by passing object with defined entryChunkName key and the path to js file as a value:.

The desired solution is to find all. In order to do that, we will implement getFilesFromDir function in files. Then we can import and replace entry property with the modified result of getFilesFromDir function:. Note: final version of webpack. When the entry point is set, we can jump into the configuration of the html-webpack-plugin part.

The main goal of this plugin is to generate an html file in the dist folderincluding corresponding javascript file. For instance, if we have generated a contact page, we expect to have contact. At a minimum, we want to provide three configuration options:. As we want to split vendor i.I know most of you Angular gurus out there are asking why anyone would want to do this.

Angular is an enterprise framework meant for building SPAs, not individual widgets. I definitely agree that SPA design is where Angular shines, but not all businesses are able to follow such a pattern, or are upgrading to a SPA and need to be able to build out individual widgets to replace existing legacy widgets until they can fully upgrade to a SPA. So how do we get around this? One solution that you can find online to make this work is to simply wrap each of your Angular Applications in an iFrame.

For simple apps, this can work, but when things get more complicated and you need inputs in or out of your application, this can become more of an issue. Your application also does not have access to the routes on the parent windows, and ends up a communication nightmare.

Use Angular Elements. If you have not used Angular Elements, they are a fantastic tool that allows you to compile Angular applications into Web Components.

I will not go into how to create Angular Elements in this article, but there lots of great resources out there on that topic.

The issue became upgrades. If App 1 upgraded Angular or another dependency that App 2 relied upon, and deployed before the other app upgrades, and there was a breaking change, then one or both of the apps would just stop working on the page.

This is a big issue because it only occurs at run time and there is no way to know if one App has a breaking change until you throw both on a page. So while a viable solution, this was not the solution we were looking for.

This led me to look for a new answer, something that would support the sandboxed approach of iFrames, with the ability for apps to live natively on the page as with Angular Elements. After digging for awhile, I was unable to find a solution to this problem. So why do these apps only show up when the top one is available? To figure this out, we have to dig into how Angular compiles our files.

When we look under the hood, Webpack is being used to create our bundles. Knowing this and digging in, I discovered the Webpack creates a single namespaced object on the window. To see this, open your console on any page with an Angular App on it and type window. Once you see that, you will see all the objects that webpack has namespaced underneath this object. This gave me the idea to try to rename the outputted namespace. This is a very powerful tool that allows you to configure Webpack for your Angular build process.

This tool works for both Nrwl Nx and a regular Angular application. In this tutorial, we will look at just implementing in an existing standalone Angular App. To do this, we just need to add a file at our root level; we will call this webpack.

Once you have that created, you just need to add the following:. We can see our app is now up and running! There are some disadvantages and limitations with this approach. The first one is what you can do with the router There are two apps fighting for the same routes. This also means that you are loading Angular and all shared dependencies twice. Please feel free to comment and share your experiences with this. Nick Favero is an Angular advocate who loves the environment it provides.Unfortunately it is not possible to run several create-react-app applications on the same document because the JavaScript bundles resulting from a create-react-app project is not without side-effects: The bundled WebPack runtime writes an object on the global scope, which prevents to load several such bundles.

multiple react apps on same page

The following steps illustrate the problem and show how to fix it. Changing the second React app to run on another port in development mode:. Change the DOM node on which the second React app is bootstrapped:. Run the first React application:. Run the second React application:. Load the second React app on the document of the first React app:.

Unfortunately this does not have the expected result: We only see the second React app bootstrapped on the page. Somehow loading the scripts of the second React app has a side effect and prevents the bootstrapping of the first React app!

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It turns out that the WebPack runtime is the problem here. The WebPack runtime adds an object to the global scope which is used to lazy-load chunks. The default name for this object is webpackJsonp. The name of the webpackJsonp object can be configured in the WebPack config. This needs to be changed if multiple webpack runtimes from different compilation are used on the same webpage.

To get access to the WebPack config of a create-react-app project, you need to eject or use another customization mechanism like customize-cra. Then you can change the Webpack config like this:.

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Once you have changed the jsonpFunction of your second React app to a unique value, you must restart the development server npm start. Make sure that the document of the first app still references the correct scripts from the second app. Sometimes WebPack decides to rename the chunks…. Note: I only showed here how to adjust the WebPack configuration for the development build. The same change is needed for the production WebPack configuration. For production the project also has to solve the challenge of adding the correct script names to the integrating document, since WebPack is typically configured i.

Sign in. Hosting multiple React applications on the same document. Jonas Bandi Follow. I'm an enthusiastic software professional.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Already on GitHub? Sign in to your account. I'm working in a concept where I need to build more than one React root components or applications co-working together differently, based on the current location. See image below:. This mean each application will render children as they want, or just interact with some server or API based on their current state, pretty much directed by the current location.

However, when a certain UI action say click is triggered over one app's component or button let's sayI want to update the location in a way all Router instances from react-router get notified so they can render their children the applications themselves correctly. Since I still don't know if this is an issueI will use the template provided on the repo. There are certain restrictions I need to accomplish like the usage of a custom router creation, like follows:.

The reason is simply I need to define my own stringifyQuery and parseQueryString functions. Go clicking in different "apps" links, so they will alert you with which router has got the update. Fair enough. That works. Just for curiosity, could you elaborate how does it work internally to understand more? If you navigate with e. Therefore if you have two routers mounted with history1 and history2history1. Actually, it will, but based on the browser URL change. So, things like state won't get communicated along with it.

It would essentially be like using a lossy IPC protocol. As taion said, using the same history object would be best and semantically represents what you're trying to do anyways.Thank you gaearon! React documentation may be the most accomplished one I ever seen on a NodeJS project. Despite the fact CRA, Next, Gatsby or jsx synthax are genius abstractions, they may all hide the powerfull opportunities plain React has to offer.

When I execute the codeon the click of first like button I get you liked comment number undefined. Only for the first like button. Did anyone encounter the same issue? For this example, you cannot use import because browsers would not understand it, you would have to use a transpilator before on server side, like babel, but, again, for this example, using react on a existing web page, regardless if it uses react on server side, you could not consider the use of the transpilator.

I'm Just approaching the world of JS and react. This simple example let me. Learning React in a hurry. Thank you. Unexpected closing tag "p". It may happen when the tag has already been closed by another tag. Plus you get to choose whatever language for your backend which can also be JavaScript. This is just one example of how to quickly add React to a site, without a toolchain.

So without any JSX, Babel etc. There are other examples that cover other ways including JSX, and it is noted that this would not be the approach to using multiple components when building a SPA to scale.

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What the commentID at line 30 was supossed to do? I thought that it should set a id in the button element, but it didnt. I share the code. The purpose of this props is only to differentiate the LikeButton components. Skip to content. Instantly share code, notes, and snippets. Code Revisions 1 Stars 90 Forks By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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I need to develop some basic components to add them to an existing webpage. I want to start with the default create-react-app. I need to build both components individually. When I run yarn build i get a main.

Is there anyway to end up with two different main files? Is that a bad approach?

Multi-language Translate React JS APP with React Hook & I18NEXT

If I need to use a third party library, lets say axios, and I will need them on both components Will it be imported twice? Learn more. Ask Question. Asked 2 months ago. Active 2 months ago. Viewed 45 times. Any advice would be appreciated!

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multiple react apps on same page

Why do you need to build the components individually?We had 4 React apps running on the local server. All apps were running on different ports because we can not start multiple React Apps on the same port. We had to build a single sign-on server. Out of 4 react apps one will be responsible for managing authentication and based on roles or department redirecting to other apps. The Auth app will get token from Auth API and will store it to local storage, and other apps will be using this token for authentication while calling APIs.

Now while calling API from any React app we need to send the token with it. Since the token is stored in local storage by Auth App which is using a different port so the local storage will not be accessible for other react apps. So if you have to store permissions and anything else which is shareable and exceeding to 4 KB the cookies will not be useful. Here we need to use a reverse proxy server to do this.

Why not use Nginx here? You can but there is a problem, React does not add namespace in the assets path so assets will not be loaded and you will see a blank white page always, and there is no way in development to add the namespace in asset path without ejecting CRA.

So if you are Ruby developer then you are going to enjoy rest of the blog. But if you are not a Ruby developer there is no issue because Ruby is nice and easily understandable. You just need to follow the steps. Run below command on the command line where you have stored above files.

This command is responsible for starting your rack server. Now your Rack server has started and ready do proxy pass. Port is default port defined for Rack server. By using Rack server you can run multiple react apps on the same domain in development environment with local storage and cookies shareable among all applications. This solution is not restricted to only React apps, it can be used for any other client-side frameworks too.

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Learn how your comment data is processed. Skip to content Content posted here with the permission of the author Rahul Ojha, who is currently employed at Josh Software. Solution: We will be using a single domain and will access different React apps using namespace in URL.

multiple react apps on same page

RVM is Ruby version manager. So it detects app name from the first request to the app which is stored in an instance variable and redirects to that app for assets. Conclusion: By using Rack server you can run multiple react apps on the same domain in development environment with local storage and cookies shareable among all applications.

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