Why build your forms with Redux Form – DailyJS – Medium

Why build your forms with #Redux Form:  #ReactJS

  • Why build your forms with Redux FormWhen I usually create forms for my React/Redux applications I tend to keep the value of the inputs on the application state, with little to no editing, (because my forms are usually simple), I never stopped to realize what that means.
  • It also receives an event handler that will update the state when the user interacts with it.It means that when the user types the letter “J” on the input, what is visible is not the same “J”, it may be an identical “J” that comes from the state, or whatever the event handler has put in there.Ok but, that doesn’t answer the first questionBy having all the application state in the JavaScript app and using controlled components we get a single source of truth and take full control over the application behavior.In the context of a form, our React component is able to:do instant validation;control the input value format;enable, disable, show or hide components given the state;handle dynamic inputs.Although it is highly recommended to use controlled components, it is also good to point the drawback that you will have to create event handlers for all your inputs and that may be a bunch of code that doesn’t make sense to the application.What about Redux Form?Now that is known why to keep the form data in the state and you reason if that makes sense for your application we can come back to our main subject.
  • It keeps track of all common application form state such as:The fields that are in the form;The values of each field;The focused field;If the field values are valid;The fields that the user have interacted with;If the form is being submitted;If is happening any asynchronous validation.Let’s take a look at a bit of code and see how to do a setup.Here we connect the form component to Redux by decorating it with the high-order component reduxForm.
  • It will also hand us the handleSubmit function, which will take care of the submission behavior.The Field component takes our input component as its props and acts as a container, bringing the application state to the input component and binding the event handlers to update the state in store.Look at the InputText component to see the props we receive from the Field.One important point is that it’s still a developer’s responsibility to write the form and inputs components, this way the library does not take the flexibility from you to manage the behaviors of your form the way you want, or even add custom ones.And to finish our integration we add a reducer that will handle the state changes of your form.Simple isn’t it.Just one more point.
  • Look that the default value of the input is defined when the high-order component reduxForm is called and comes to the input within the prop input and not from the react’s prop defaultValue, this way we guarantee that our form values are all represented in the application state.In summary, having all your form data in application state gives you control over its behavior and you can easily implement that on a React/Redux application with Redux Form.I have created a repository on GitHub with the implementation above.

When I usually create forms for my React/Redux applications I tend to keep the value of the inputs on the application state, with little to no editing, (because my forms are usually simple), I never…
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Top ReactJs Online Learning Courses

Top #ReactJs Online Learning Courses

  • ReactJS is a JavaScript library that has become very popular for its performance and its flexibility.
  • If you are looking to create an app that renders a lot of dynamic data quickly and also performs well on mobile, then you must  learn ReactJS.
  • Look at some best online courses that i found for learning below:

    React JS and Redux – Mastering Web Apps – This course will help you to build the React JS & Redux apps that you want.

  • Instructor: David Katz

    Course Length: 4.5 hours

    Number of Lectures: 77

    Number of Students: > 18,000

    Rating: 4.5 stars (out of five)

ReactJS is a JavaScript library that has become very popular for its performance and its flexibility. If you are looking to create an app that renders a ..
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You.i TV demonstrates the ability to take React Native to new platforms leveraging the power of You.i Engine

You.i TV goes all in with @reactnative

  • July 28th, 2017 — Ottawa, Ontario — You.i TV, a global leader in video experience platforms, today announced support for React Native as a development framework on top of You.i Engine.
  • With growing demand for a consistent development strategy to bridge mobile and 10-foot platforms, developers now have more flexibility in how they build You.i Engine video applications.
  • By extending the React Native platform support to include You.i Engine, the same developer experience can be applied across mobile, streaming pucks, gaming consoles and smart TVs.
  • At You.i TV our founding principles are to enable the seamless delivery of beautiful user experiences, consistently to every screen,

    You.i TV is a privately held company whose You.i Engine software platform enables TV and media companies worldwide to create fans, engage users, and convert customers.

  • You.i Engine allows brand owners to build personalized, profitable experiences quickly on all platforms – mobile devices, set-top boxes, game consoles, and streaming devices – from a single code base.

You.i TV, a global leader in video experience platforms, today announced support for React Native as a development framework on top of You.i Engine.
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webpack optimization — A Case Study – WalmartLabs – Medium

  • However, after going through webpack’s docs and code, there didn’t seem to be an easy way to disable that with a single switch.
  • I opened an issue here and after some discussion with webpack’s Tobias Koppers, we settled on allowing webpack’s node option to accept a false config.With NodeSourcePlugin disabled, our code that depend on it all failed and I was able to pinpoint among our hundreds of components, which one to look into.I found out that a few components that have server side only behavior implemented it through the runtime flag provided by exenv, like this:import { canUseDOM } from “exenv”function foo() { if (!
  • canUseDOM) { const crypto = require(“crypto”) // do something with crypto }}The idea is simple, if code is not executing on the browser, then do something on the server side only using the crypto module.
  • Unfortunately, webpack only does static analysis to find out what code needs to be bundled.
  • That means NodeJS crypto is included even though it’s only needed for server side.

Since we open sourced part of the Electrode platform from @WalmartLabs, we’ve had a lot of contributions to our NodeJS and ReactJS archetype modules, including bug fixes, new features, and updating…
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Techniques for decomposing React components – DailyJS – Medium

Techniques for decomposing #ReactJS components:  by @Dvtng #JavaScript

  • Here are three techniques to get you started, from the simplest to most advanced.Split the render() methodThis is the most obvious technique to apply: when a component renders too many elements, splitting those elements into logical sub-components is an easy way to simplify.A common and quick way to split the render() method is to create additional “sub-render” methods on the same class:While this can have its place, it is not a true decomposition of the component itself.
  • As a bonus, when React’s new Fiber architecture arrives, the smaller units will allow it to perform incremental rendering more effectively.Templatize components by passing React elements as propsIf a component is becoming too complex due to multiple variations or configurations, consider turning the component into a simple “template” component with one or more open “slots”.
  • Utilise the ability of React to pass elements, not just data, as props, to create a flexible template component.Another component can then have the sole responsibility of figuring out what to fill the metadata and actions slots with.Keep in mind that in JSX, anything that’s between the opening and closing tags of a component is passed as the special children prop.
  • In the comments example, this would likely be the text of the comment itself.Extract common aspects into higher-order componentsComponents can often become polluted by cross-cutting concerns that aren’t directly related to its main purpose.Suppose you wanted to send analytics data whenever a link in a Document component is clicked.
  • The obvious solution might be to add code to Document’s componentDidMount and componentWillUnmount lifecycle methods, like so:There are a few problems with this:The component now has an extra concern that obscures its main purpose: displaying a document.If the component has additional logic in those lifecycle methods, the analytics code also becomes obscured.The analytics code is not reusable.Refactoring the component is made harder, as you’d have to work around the analytics code.Decomposition of aspects such as this one can be done using higher-order components (HOCs).

React components have a lot of power and flexibility. With so many tools at your disposal, it is incredibly easy for components to grow over time, become bloated and do too much. As with any other…
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Reactjs Development Services India

#ReactJS has proven to be one of best #Javascript front-end library

   #webdev

  • ReactJS has proven to be one of the best frameworks out there and that is visible by the adaptability of the same by world famous companies.
  • It gives a near perfect experience for the client as well as the developer and ensures that interfaces built on it are not only great in performance but are also visually appealing.
  • Techuz has provided reactjs web development services to various clients all of which have been amazed by the technology.

Hire dedicated reactjs developer from top reactjs web & mobile application development company India Techuz. we have expert reactjs team for innovative solutions.
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