React Behavioral Wrapper Components – Ian Carlson – Medium

React Behavioral Wrapper Components  #ui #react #javascript #reactjs

  • But because of how flexible React is you can create wrapper components that add behavior to the children being passed through.
  • This is more applicable when using Redux since not all the backend requests are made within the same component, like a session container for example.Here’s a example of creating an opacity animation component that adds the animation to any child component.
  • This is based on the example in the React documentation using the CSS transition group extension to apply fade-in, fade-out animations based on the lifecycle of the child component(s).
  • The former is actual animation time and the latter is how long temporary classes will stay in existence.Here’s an example of how to use the OpacityAnimation:You can also pass an array of children as well, but it’s important to carefully manage the key properties on each child — even for just one child.
  • For example, a tooltip component would display the children as is, but then attach event handlers to display the tooltip on the right conditions.

Another great thing about React is how easy it is to add behavior to components through composition. Typically new people only think of composition in terms of layout. But because of how flexible…
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Using RxJS with React.js: Part 3 — Dispatching events from Component

Using RxJS with React.js: Part 3 - Dispatching events from Component

  • Using RxJS with React.js: Part 3 — Dispatching events from ComponentThis is the third part of the series.Illustration of unidirectional flow between Subject and ComponentUnidirectional cycleEarlier we saw an example of HoC streaming props to the base component.
  • Let’s now look at ways how we can dispatch events from inside the base component, update some value, and the updated value will then be streamed back to the component completing one unidirectional cycle.We can take the example of a form input field.
  • To keep things simple, let’s say BehaviorSubject is a kind of Subject, that can already start with an initial value.import { BehaviorSubject } from ‘rxjs’;const subject$ = new = console.log(x)); // prints `foo` right awayThe base Component with form inputLet’s say this is our base component:import React from ‘react’const MyComponent = React.createClass({ render() { const { value, handleChange } = this.props; return ( div input type=”text” value={value} onChange={e = handleChange(} / pCurrent value: {value}/p /div ); }});From the base component, we are accessing the props value and handleChange.
  • First one is a stream of the input value, and the latter for handling the change.import { BehaviorSubject, Observable } from ‘rxjs’;const formInput$ = new BehaviorSubject(‘foo’); // with initial valueconst handlers$ = Observable.of({ handleChange: value = formInput$.
  • scan(function (props, emitted) { return { …props, …emitted }; });Observing the base ComponentNow that we have the props$ observable ready, we can integrate it with our base complement easily using the observe function from FrintJS:import { observe } from ‘frint-react’;const ObservedRoot = observe(function () { return props$;})(MyComponent);Now you can stream the props, including both the input value and the change handler from your HoC, and also trigger changes in the Subject from your Component’s events.Live demoVisit this example in JSBin.

Earlier we saw an example of HoC streaming props to the base component. Let’s now look at ways how we can dispatch events from inside the base component, update some value, and the updated value will…
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Admin-on-rest now supports GraphQL backends

Admin-on-rest now supports #GraphQL backends  #reactjs

  • Many such implementations already exist, contributed either by us, or by the community:

    You might also know about GraphQL, a query language for APIs, often presented as the successor of REST.

  • It is now possible to use a GraphQL server with Admin-on-rest:

    A version of the demo using this client source code for this demo is available at is an example of how to register this client with an admin-on-rest application.

  • It is of course possible to specify the endpoint’s url or provide a custom Apollo client if further customization is needed:

    By default, the admin-on-rest client will run an introspection query on the GraphQL endpoint to automatically discover the available types, queries and mutations.

  • In order to communicate with admin-on-rest, a rest client should implement the following REST verbs::

    To facilitate the client usage, the client expects the queries and mutations declared in the server schema to follow a few conventions:

    As it is possible to have read-only resources (only list and detail pages), the only requirement is to have at least the and queries implemented for a resource to be usable.

  • A flavor acts as the translator between admin-on-rest requests and your GraphQL queries and mutations.

Published on 1 June 2017

by Gildas

with tags admin-on-rest react graphql oss

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Redux with React – First Look #reactjs #Redux #javascript #appdev #programming #devops

Redux with React - First Look  #reactjs #Redux #javascript #appdev #programming #devops

  • Let’s start with the basics:

    According to the official site Redux is defined as a predictable state container for JavaScript apps.

  • In Redux, reducers are functions (pure, I will explain what a pure function is later) that take the current state of the application and an action and then return a new state.
  • 3 – Store

    Store is the object that holds the application state and provides a few helper methods to access the state, dispatch actions and register listeners.

  • – Changes are made with pure functions: To specify how the state tree is transformed by actions, you write pure reducers.
  • You might be interested in:

    Predictability of outcome:

    There is always one source of truth, the store, with no confusion about how to sync the current state with actions and other parts of the application.

influenced by Flux architecture and became popular very quickly, excellent documentation and size (2 KB). Also it is very easy to use redux with react
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Animations In React.js – Duncan maina – Medium

Animations In React.js  #javascript

  • ReactCSSTransitionGroup requires three elements to work.A ReactCSSTransitionGroup elementAt least one item to render outCss to specify the animation type.The ReactCSSTransitionGroup element wraps the content that you want to appear with css transitionName=”example” …transition options… { items } /ReactCSSTransitionGroupThis element must be initiated with a transitionName, which tells react which css animation to render out.
  • The transitionName gets translated to a class name that you select in css, followed by the transition property..example-appear { opacity: { opacity: 1; transition: opacity 2s ease-in;}In this example the element will fade in from the background starting at an opacity of 0.01 to an opacity of 1 in two seconds.React.js allows you to set animations to elements in your react application with ReactCSSTransitionGroup api.
  • This allows other developers to get an idea of the exact state of the program at any given time.ReactCSSTransitionGroup works well for simple css animations but other options exist for more complex animations ie: animations that involve motion.
  • It also contains many of the popular animations styles such as: bouceOut, bounce, bounceIn, fadeIn , fadeOut , flip , headShake , jello, rotateOut , rotateOutDownLeft , rotateOutDownRight , rubberBand , { bounce } from ‘react-animations’;import { StyleSheet, css } from ‘aphrodite’;const styles = StyleSheet.create({ bounce: { animationName: bounce, animationDuration: ‘1s’ }})try them out at : for a full list of animations and instructions on usage see Motion: a javascript library that handles the physics of component animation and provides an easy to use api for accessing those animations.
  • find more information here: Nash Vail also wrote a great tutorial on motion that can be found here: defaultStyle={{x: 0}} style={{x: spring(10)}} {interpolatingStyle = div style={interpolatingStyle} /}/MotionReact Flip Move: react flip move is a library that allows you to animate flips for your react components.

Css Animations in react.js are handled through the ReactCSSTransitionGroup Api. It provides a way to perform css when components enter or leave the DOM. ReactCSSTransitionGroup requires three…
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ZEIT – Next 3.0 Preview

  • On the heels of our announcement of free static deployments earlier today , we are excited to introduce a beta release of the upcoming Next.js 3.0, featuring , dynamic components and various bugfixes.
  • It will seamlessly build your Next.js app as a standalone static website .
  • The exported app supports almost every feature of Next.js , including dynamic URLs, prefetching, preloading and the new dynamic imports.
  • Next.js 3.0 comes with TC39 dynamic import support.
  • Next.js supports server side rendering for dynamic imports.

Next 3.0 features Static Exports with one command and Dynamic Imports
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Front end architecture – João Paulo Lethier – Medium

Front end architecture  #javascript #frontenddevelopment #react #reactjs #reactjs

  • So, almost every project I worked use MVC architecture, and when I started to work in some front end projects, using angular or react, I tend to structure my project’s folders and files thinking in MVC, using the same structure I would use in a backend project using RubyOnRails.Taking advantage that in my job team, at SumOne, we decided to organize some talks, I choose to do a talk about front end architecture so this would be an opportunity to learn.
  • Besides the type based folder structure, that is similar to MVC structure folders and what I was used to, I found that most front end developers recommend a feature based folder structure to organize project’s code files.So, I did a small presentation and develop a sample project on github to show how a react project would like on each kind of folder structure: type based, feature based and mix based.
  • For example, if you have a list feature, you would have the API file that make the request call to get items to list, action file that call API and return the answer to view and view file itself on the same folder.Lastly, you can use a mix based folder structure, organizing by feature first, and inside of each feature folder.
  • This structure makes easy to find all code related to a feature, for example, if we have a search feature and want to change the api request for the search form, I just have to search for the api file on search feature folder.
  • Following this mix based structure, if you have a large feature, that has a lot of code files, more than one api call, for example, you can organize files by type(API, Services, Actions, Views, Styles, …) inside the feature folder.

I am a developer since 2010, but only recently I started to work a little more with front end frameworks. I’ve worked a lot more with backend development, I have a lot more experience creating and…
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