React Router DOM v4 Tutorial (with Examples) • techiediaries

#React Router DOM v4 Tutorial (with Examples)  #reactjs #javascript #Programming #coding

  • The < Route > component is one of the most useful components of React Router v4 and the idea behind it is simple, wherever you want to render something when only there is a match with the location’s path you can use a Route component.
  • We can just append the name to be used for the variable plus a colon : to the end of the route’s path, for example: – – When there is a path match an object which has the following properties will be created and passed to the component: – -…
  • First we import the necessary routing components such as Route and BrowserRouter – – Next we create the base layout component, besides common HTML tags we also use React Router v4 components Link and Route: – – Next we create our pages: – – And finally we create the App…
  • In our example app we used the prop exact in the Route for component HomePage – – That’s because React Router v4 uses inclusive routing instead of exclusive routing used by React Router v3 so without exact property the home component will be rendered with all other components, for example…
  • You can also navigate inside your React application using methods from the history object, for example: – – Which are equivalent to: – – Whenever you want to redirect to another location, you can place component which is when rendered will redirect to the location specified in to prop that…

In this tutorial we are going to get you started with react-router-dom using an example React application showing you how to use different concepts such as Link and NavLink for creating links (instead of anchors) in the React way, Switch and exact for enabling exclusive routing and browser routing history.
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React Router Tutorial Example From Scratch

  • React Router Tutorial Example From Scratch is today’s main topic.
  • Routing to front end application is a very important concept and today I am going to show you how to use react router v4 in our React.js application.
  • Create one folder inside root directory called app and in that make one file called main.js – – The further step, make one file inside root called webpack.config.js and copy the following code into it.
  • There are two types of router object.
  • Every router creates history object to keep track of the current location of the page.

React Router Tutorial Example From Scratch. We are using React Router version 4. react-router v4. A basic example of react-router in React.js project.
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Implementing redux and react-router v4 in your react app

  • Then we created our main reducer function inside it, we checked for different action types and updated our reducer state accordingly.
  • Let’s install redux-thunk

    Let’s edit our index.js to make use of our new redux store.

  • Inside your project directory

    Input preview is a component which will render an input component which on update will update our reducer message.

  • let’s pass an onChange function to input tag inside your App.js create a method called _onChange

    Above on every onchange, we dispatched setMessage action with the new value of our input tag.

  • So in above code, we called the _onChange function on every change to update the value of message in reducer.

Okay so without further ado let’s start by installing redux and react-redux into our project…
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ReactJS Authentication Tutorial, Part 2

ReactJS Authentication Tutorial, Part 2  #web_dev #front_end #cli #reactjs #Programming

  • The component is pulling data from an API, so it needs a way of holding that data.
  • In the constructor, we define the initial state as seen in the code below:

    In the method, we call the method we exported from the helper file and set state as seen below:

    Now, we took advantage of one of the ReactJS lifecycle hooks, .

  • So, we invoked the method in the hook as seen below:

    All we are trying to do is tell ReactJS to load the data from the API immediately when the component gets rendered.

  • Finally, we rendered the component with the ReactJS method.
  • This renders the root component in the div, which is the starting point of our ReactJS application.

We continue our series on creating an authenticated ReactJS application by looking at how to setup our front-end with the help of Facebook’s CLI tool.
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Changing Old Habits in React Router 4 – Ivan Montiel – Medium

Changing Old Habits in #ReactJS Router 4:  by @TheCapsuleCat #JavaScript

  • Well, for starters, you get to write your router code as if they were just normal React components.If you’ve ever tried to write this in React Router v3, you quickly realized that while you were writing components, that Route didn’t really behave like a component:Router IndexRoute component={Home} / div {/* This won’t work, Route will complain that it cannot be rendered */} Route path=”/about” component={About} / /div/RouterSo Route behaves like a component, so what?
  • However, both packages provide a similar API, allowing you to take the same routing style that you wrote in one platform to another.BrowserRouter and NativeRouterWith the new BrowserRouter and NativeRouter components, you don’t have to worry about setting up your history.If you’ve worked with React Router 3, you’ve probably written something like this: Router history={browserHistory} .
  • Or if you needed to change the basepath of your Router, you had to make your own custom browserHistory object.With React Router 4, all you have to do is:import { BrowserRouter } from App//BrowserRouterThe BrowserRouter component takes a basepath, allowing you to bypass all of that work that you used to have to do.Route exactBefore we get into Route as a renderable component, let’s talk about how they made Route more declarative with exact.The concept of an IndexRoute is gone, and instead you can use exactto match indexes.
  • This syntax also provides a lot more flexibility over IndexRoute; you can now specify that certain routes must match with or without a trailing slash.import { Route } from ‘react-router-dom’Route exact path=”/” component={Home}/Route path=”/about” component={About}/Renderable RoutessRoutes are just components in React Router 4!
  • It utilities the declarative nature of React and makes Routes real components in the sense that they can finally be rendered anywhere in your tree.If you would like to see a side-by-side example of v3 and v4 of React Router, check out my Github repo:

At React Conf 2017, Michael Jackson & Ryan Florence talked about React Router in their talk called “Learn Once, Route Anywhere”. They unveiled the new React Router website, and with it, the new focus…
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Implementing feature flags in single page apps, using React and Redux Saga

  • The challenge with feature flagging single page apps is handling the state transformations (the changes in a webpage’s DOM) in a way that maintains performance and a fluid user experience.
  • With the help of React Router, creating a single page application can be a very quick and easy process, allowing developers to minimize risk and test features without degrading the user experience.
  • The user-type feature flag controls the content that is displaying depending on the group of current logged in user, while header-bar-color returns a hex code to toggle the color of the navigation bar.
  • Once the client is ready, the effect will send the action off to our reducer, to store the client and current feature flag state in props.
  • There are many ways to feature flag within a single page app, depending on your case and the complexity of your features.

Built on frameworks like React, Angular, and Ember, single page apps (SPA) are becoming the new norm for modern applications. They center around dynamically updating a single HTML page via AJAX and HTML5 to deliver a more fluid and faster user experience. This introduces some new complexity when it comes to controlling access to front-end features, specifically via feature flags.
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Context in ReactJS Applications

  • The short answer is that you should very rarely, if ever use context in your own React components.
  • Context acts like a portal in your application in which components can make data available to other components further down the tree without being passed through explictly as props.
  • If an interim component does this, a child component won’t update, even if a context value changes:

    In the above example, if changes, will not render, because its parent returned from .

  • Libraries like React Router use context to allow the components that they provide application developers to communicate.
  • It exposes the object on the context, and other than that it simply renders the children that it’s given:

    expects to find , and it registers itself when it’s rendered:

    Finally, we can use the and components in our own app:

    The beauty of context in this situation is that as library authors we can provide components that can work in any situation, regardless of where they are rendered.

There is a lot of confusion amongst React developers on what context is, and why it exists. It’s also a feature that’s been hidden in the React documentation in the past and, although it is now documented on the React site I thought a post on its usage and when to use it would be of use.
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