React architecture for a huge business application

问题:

So we've recently picked up React in our company as the front-end technology to build our huge business web application. By saying recently, I mean we don't have any previous experience with React (we have a huge background of AngularJS), and by saying huge application, I mean it's really huge and very dynamic with lots and lots of different pieces and functionality.

Because we will have a lot of huge components that all play a very important role and have complex logic inside them, and because we want them to be easily pluggable and reusable, we want them to be as isolated as possible from the outside world and other parts of our application, because otherwise because of their size and complex functionality it would be pretty much impossible to develop and maintain them. That's the reason why we have decided NOT to use Redux, at least in the beginning, while we are developing just the separate components themselves, because it compromises component isolation and makes the whole application data flow logic impossible to understand when there are so many complex components. Although I believe our choice could be wrong, because as I've already mentioned, we have no experience with React.

As I've already mentioned, the application is very dynamic. By that I mean that components are actually rendered by data. We use various configuration provider classes that interacts with our API endpoints to get the pieces of our application's configuration, like configurations of navigation, pages, various forms, lists, etc., and then try to render components that are read from that configuration.

The problem is, after a couple of weeks struggling to get the momentum with React and discover the right patterns and common solutions to our problems, we've been talking in our crew, that maybe React is not the right technology for us, as it's a UI library, not event a framework, and it doesn't help us a lot, but just adds its rendering rules that we have to break at times to achieve the dynamics and component independence we want.

Considering the component isolation and data flow management, I personally have heard that there is a language for front-end development Elm that has pretty robust data flow architecture where each component has its own model that is separate from others, but I don't know whether it's worth a try, as it may fall behind our big requirements pretty soon too.

The reason I'm writing this question here is that I hope to get an insight from people that have a solid background on working with huge front-end applications. I'd like to know whether it's possible to develop such an application with React, whether React is suitable for such complexity and dynamics, whether we really need Redux or something else, what path, practices, ideologies should we follow. If you understood my question correctly, it's more the architecture side that we are struggling with, than the technological. Maybe we are just walking the path that leads to more and more struggle and complexity but not towards production.

回答1:

There is absolutely no question that React/Redux can (and is widely) used to develop the kind of applications that you describe. Nothing in your description makes what you are building so unique that it excludes React as a platform for building it. We are actively working with a large enterprise customer who is building their entire front end - with 100 + SPA (Single page applications) in React. This is a team of over 100 developers over a 2-3 year project.

The way we structured this has been crucial -

First, you want to choose a UI component library. A few examples below :

• MaterialUI - https://github.com/callemall/material-ui
• React Strap - https://github.com/reactstrap/reactstrap
• React Bootstrap -https://github.com/react-bootstrap/react-bootstrap
• Khan Academy React Components https://github.com/Khan/react-components
• https://github.com/elementalui/elemental

We basically took one of these and built a component library off of them, because our components are very custom styled.

Second, we created a modular architecture, where each module (SPA) is an npm package with a main container component and redux store.

Finally, we have a central server package, where each of the modules is registered. The server package is responsible for authentication, authorization, logging, routing, etc.

The essence of this answer is not to advise on how to structure a large React application, but to let you know that React can be (and is being) used to develop applications similar to what you are describing.

回答2:

Getting started writing more complex apps in React can really be a struggle, I know exactly how it feels!

As you say, React is a UI lib and not an event framework. That's why you typically need a library to handle events, for example Redux. You clearly state that you decided not to use Redux (you even used capital letters for not :) ). I would take a step back if I were you and reconsider that decision. You say the reason for not using Redux is that your cannot keep your components easily pluggable and reusable when using Redux. I would argue that is not true. Redux is totally decoupled from your React components. Redux only handles receiving events, and managing state. From the React components point of view, it just receives data in props and sends events by calling regular functions. It's possible to still unit-tests, reuse, etc.

I would suggest you take another look at Redux with this in consideration. Happy to help if you have more questions!

回答3:

I'm at the similar situation right now. I have a background in large desktop applications (ERP, LOB - WinForms, WPF) - 1000+ modules, very dynamic (more than 70% of the UI was generated by input data/configuration), adding new functionality was just about extending some configuration (without touching source code).

I'm deeply investigating current web technologies and I'm more and more convinced that React is not a good fit for that. React really shines in small/middle size applications where you (and other team members) develop every page/component 'manually' (not dynamically generated) and you want to have one global state. But it doesn't help you with building large scale application out of the box - it is only UI library (so no support for modules, routing, forms, binding, http requests, static typing (typescript), etc.) and to my surprise, there is no support for style shadowing/encapsulation (you have to integrate, for example, CSS Modules, by your own). And at the end, you have to constantly bother with libraries versioning (to make them always work together is truly time and energy consuming).

I have a great experience with Angular 2/4+ and I think, for now, it is the best technology for that kind of the applications (if you know WPF, it is very similar). It is a full framework, which is prepared to the scaling out of the box. You can split your app into independent modules (specifying which components will be visible to the outside world), every component has public api (statically typed, inputs/outputs) and encapsulated css styles (there is no interference between others). For the global state (logged in user, global configuration, etc.), you can still use library ngrx/store (which implements Redux pattern and comes with extra nice things, like 'effects' and integrates really well into Angular ecosystem).

I tried to do in Angular really crazy stuff (dynamically generating the whole application from backend configuration) and everything worked perfectly, as expected.

回答4:

React , Redux will make things easier because When it comes to complex applications you can create Well structured data object. then you can manage the Complete UI through React and its Materials ... There are some reasons Why this is right choice

1. State Management ,
2. Tree Structure data handling,
3. Reduce the code,
4. You will be knowing where the changes made (Actions, Reducers)
5. Your Component will only taking care of UI things

The things that you have to do is Structuring your data

回答5:

You nailed the issue in your question- react is a view library, not an application framework. The real question is whether React+Redux(or other state management system) is appropriate for a large LOB app.

I will share some insights from our team’s experience in this realm. Large LOB apps have been developed using the MVC/MVP/MVVM design patterns for decades. These are tried and true patterns that ship software. Couple that with dependency injection and you have a modularized, testable, maintainable application. AngularJS (2.0+) is founded on these principles and leverages them deeply. For this reason we use AngularJS for all of our enterprise line of business apps.

React on the other hand is a lightweight, spritely view render that is awesome for smaller applications and client facing pieces (for example taking a dynamic survey or a simple dashboard). We often turn to React and VueJS here because the full AngularJS stack is way overkill and too heavy.

回答6:

Completely understand your feelings when you start with React and Redux. We were in the same situation when we started with React in our company. At first React has different approach than other frameworks. Yes of course it's not framework, it's just library. You have to start thinking in React way and that is: React components just render state (It's like you render scene on your graphic card at first you have to prepare scene then you are able render), all what component can do is dispatch actions, or better call just action creators.

You need some smart way how to store state in that point I will suggest use Redux.

We also use TypeScript with combination React, Redux. you have to write more code than pure JS but static type control is priceless when you work on large project.

Separating components logic is native approach of react ... you have to separate logic write "Dummy components" and then reuse this with connect. Or passing values as props.

We are using Thunk middleware as action creators it's good because connected component will call just method and logic is in action creators. You have access there to whole state of app then you can fetch something and base on result you can dispatch different actions.

What I like on react/ redux is how to implement async calls etc. First design component to map all states

1) like I have no data 2) data loading 3) loading done 4) loading error

For that you need only one semaphore in you state and a few checks in render method. Then one action creator that will load data and base on progress dispatch action that describing progress.

What is also cool that in react/redux app you have single data flow it's good when new dev jump into project.

For UI we are using Material UI, yes this framework has some problems but nothing what you will not able to deal with.

We are using also Router for navigating in app.

In the beginning I will avoid server side rendering because it will much easier for you start just with client side rendering and with initial state.

When we start for us was useful this template where everything works in one project JavaScriptServices

Then off course great Abramov tutorials.

For design components very useful Storybook

We can write why use or not React for long time ... but What I can say ... for us it was good choice, with some pain in begging but now we have good payback.