How to Render <a> with Optional href in React

When you’re developing an app to cater to all types of end users, conditional rendering allows you to automate your code to handle all predefined and dynamic cases without hardcoding solutions. Apart from keeping the code clean, short, and readable, it also manages a large number of possibilities with some simple structural logic.

In this guide, you’ll learn how to render an anchor element in your React app with optional href based on specific conditions.

#react

What is GEEK

Buddha Community

How to Render <a> with Optional href in React
Autumn  Blick

Autumn Blick

1598839687

How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

How to Create the Custom Radio Buttons using only HTML & CSS

In this guide you’ll learn how to create the Custom Radio Buttons using only HTML & CSS.

To create the custom radio buttons using only HTML & CSS. First, you need to create two Files one HTML File and another one is CSS File.

1: First, create an HTML file with the name of index.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Custom Radio Buttons | Codequs</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div class="wrapper">
      <input type="radio" name="select" id="option-1" checked>
      <input type="radio" name="select" id="option-2">
      <label for="option-1" class="option option-1">
        <div class="dot"></div>
        <span>Student</span>
      </label>
      <label for="option-2" class="option option-2">
        <div class="dot"></div>
        <span>Teacher</span>
      </label>
    </div>
  </body>
</html>

 

2: Second, create a CSS file with the name of style.css

 

@import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700&display=swap');
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
html,body{
  display: grid;
  height: 100%;
  place-items: center;
  background: #0069d9;
}
.wrapper{
  display: inline-flex;
  background: #fff;
  height: 100px;
  width: 400px;
  align-items: center;
  justify-content: space-evenly;
  border-radius: 5px;
  padding: 20px 15px;
  box-shadow: 5px 5px 30px rgba(0,0,0,0.2);
}
.wrapper .option{
  background: #fff;
  height: 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  margin: 0 10px;
  border-radius: 5px;
  cursor: pointer;
  padding: 0 10px;
  border: 2px solid lightgrey;
  transition: all 0.3s ease;
}
.wrapper .option .dot{
  height: 20px;
  width: 20px;
  background: #d9d9d9;
  border-radius: 50%;
  position: relative;
}
.wrapper .option .dot::before{
  position: absolute;
  content: "";
  top: 4px;
  left: 4px;
  width: 12px;
  height: 12px;
  background: #0069d9;
  border-radius: 50%;
  opacity: 0;
  transform: scale(1.5);
  transition: all 0.3s ease;
}
input[type="radio"]{
  display: none;
}
#option-1:checked:checked ~ .option-1,
#option-2:checked:checked ~ .option-2{
  border-color: #0069d9;
  background: #0069d9;
}
#option-1:checked:checked ~ .option-1 .dot,
#option-2:checked:checked ~ .option-2 .dot{
  background: #fff;
}
#option-1:checked:checked ~ .option-1 .dot::before,
#option-2:checked:checked ~ .option-2 .dot::before{
  opacity: 1;
  transform: scale(1);
}
.wrapper .option span{
  font-size: 20px;
  color: #808080;
}
#option-1:checked:checked ~ .option-1 span,
#option-2:checked:checked ~ .option-2 span{
  color: #fff;
}

Now you’ve successfully created Custom Radio Buttons using only HTML & CSS.

Rate Limit Auto-configure for Spring Cloud Netflix Zuul

Overview

Module to enable rate limit per service in Netflix Zuul.

There are five built-in rate limit approaches:

  • Authenticated User
    • Uses the authenticated username or 'anonymous'
  • Request Origin
    • Uses the user origin request
  • URL
    • Uses the request path of the downstream service
  • URL Pattern
    • Uses the request Ant path pattern to the downstream service
  • ROLE
    • Uses the authenticated user roles
  • Request method
    • Uses the HTTP request method
  • Request header
    • Uses the HTTP request header
  • Global configuration per service:
    • This one does not validate the request Origin, Authenticated User or URI
    • To use this approach just don’t set param 'type'
NoteIt is possible to combine Authenticated User, Request Origin, URL, ROLE and Request Method just adding multiple values to the list

Usage

NoteLatest version: Maven Central
NoteIf you are using Spring Boot version 1.5.x you MUST use Spring Cloud Zuul RateLimit version 1.7.x. Please take a look at the Maven Central and pick the latest artifact in this version line.

Add the dependency on pom.xml

<dependency>
    <groupId>com.marcosbarbero.cloud</groupId>
    <artifactId>spring-cloud-zuul-ratelimit</artifactId>
    <version>${latest-version}</version>
</dependency>

Add the following dependency accordingly to the chosen data storage:

Redis

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

Consul

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-consul</artifactId>
</dependency>

Spring Data JPA

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

This implementation also requires a database table, bellow here you can find a sample script:

CREATE TABLE rate (
  rate_key VARCHAR(255) NOT NULL,
  remaining BIGINT,
  remaining_quota BIGINT,
  reset BIGINT,
  expiration TIMESTAMP,
  PRIMARY KEY(rate_key)
);

Bucket4j JCache

<dependency>
     <groupId>com.github.vladimir-bukhtoyarov</groupId>
     <artifactId>bucket4j-core</artifactId>
</dependency>
<dependency>
     <groupId>com.github.vladimir-bukhtoyarov</groupId>
     <artifactId>bucket4j-jcache</artifactId>
</dependency>
<dependency>
     <groupId>javax.cache</groupId>
     <artifactId>cache-api</artifactId>
</dependency>

Bucket4j Hazelcast (depends on Bucket4j JCache)

<dependency>
     <groupId>com.github.vladimir-bukhtoyarov</groupId>
     <artifactId>bucket4j-hazelcast</artifactId>
</dependency>
<dependency>
     <groupId>com.hazelcast</groupId>
     <artifactId>hazelcast</artifactId>
</dependency>

Bucket4j Infinispan (depends on Bucket4j JCache)

<dependency>
     <groupId>com.github.vladimir-bukhtoyarov</groupId>
     <artifactId>bucket4j-infinispan</artifactId>
</dependency>
<dependency>
     <groupId>org.infinispan</groupId>
     <artifactId>infinispan-core</artifactId>
</dependency>

Bucket4j Ignite (depends on Bucket4j JCache)

<dependency>
     <groupId>com.github.vladimir-bukhtoyarov</groupId>
     <artifactId>bucket4j-ignite</artifactId>
</dependency>
<dependency>
     <groupId>org.apache.ignite</groupId>
     <artifactId>ignite-core</artifactId>
</dependency>

Sample YAML configuration

zuul:
  ratelimit:
    key-prefix: your-prefix
    enabled: true
    repository: REDIS
    behind-proxy: true
    add-response-headers: true
    deny-request:
      response-status-code: 404 #default value is 403 (FORBIDDEN)
      origins:
        - 200.187.10.25
        - somedomain.com
    default-policy-list: #optional - will apply unless specific policy exists
      - limit: 10 #optional - request number limit per refresh interval window
        quota: 1000 #optional - request time limit per refresh interval window (in seconds)
        refresh-interval: 60 #default value (in seconds)
        type: #optional
          - user
          - origin
          - url
          - http_method
    policy-list:
      myServiceId:
        - limit: 10 #optional - request number limit per refresh interval window
          quota: 1000 #optional - request time limit per refresh interval window (in seconds)
          refresh-interval: 60 #default value (in seconds)
          type: #optional
            - user
            - origin
            - url
        - type: #optional value for each type
            - user=anonymous
            - origin=somemachine.com
            - url=/api #url prefix
            - role=user
            - http_method=get #case insensitive
            - http_header=customHeader
        - type:
            - url_pattern=/api/*/payment

Sample Properties configuration

zuul.ratelimit.enabled=true
zuul.ratelimit.key-prefix=your-prefix
zuul.ratelimit.repository=REDIS
zuul.ratelimit.behind-proxy=true
zuul.ratelimit.add-response-headers=true

zuul.ratelimit.deny-request.response-status-code=404
zuul.ratelimit.deny-request.origins[0]=200.187.10.25
zuul.ratelimit.deny-request.origins[1]=somedomain.com

zuul.ratelimit.default-policy-list[0].limit=10
zuul.ratelimit.default-policy-list[0].quota=1000
zuul.ratelimit.default-policy-list[0].refresh-interval=60

# Adding multiple rate limit type
zuul.ratelimit.default-policy-list[0].type[0]=user
zuul.ratelimit.default-policy-list[0].type[1]=origin
zuul.ratelimit.default-policy-list[0].type[2]=url
zuul.ratelimit.default-policy-list[0].type[3]=http_method

# Adding the first rate limit policy to "myServiceId"
zuul.ratelimit.policy-list.myServiceId[0].limit=10
zuul.ratelimit.policy-list.myServiceId[0].quota=1000
zuul.ratelimit.policy-list.myServiceId[0].refresh-interval=60
zuul.ratelimit.policy-list.myServiceId[0].type[0]=user
zuul.ratelimit.policy-list.myServiceId[0].type[1]=origin
zuul.ratelimit.policy-list.myServiceId[0].type[2]=url

# Adding the second rate limit policy to "myServiceId"
zuul.ratelimit.policy-list.myServiceId[1].type[0]=user=anonymous
zuul.ratelimit.policy-list.myServiceId[1].type[1]=origin=somemachine.com
zuul.ratelimit.policy-list.myServiceId[1].type[2]=url_pattern=/api/*/payment
zuul.ratelimit.policy-list.myServiceId[1].type[3]=role=user
zuul.ratelimit.policy-list.myServiceId[1].type[4]=http_method=get
zuul.ratelimit.policy-list.myServiceId[1].type[5]=http_header=customHeader

Both 'quota' and 'refresh-interval', can be expressed with Spring Boot’s duration formats:

A regular long representation (using seconds as the default unit)

The standard ISO-8601 format used by java.time.Duration (e.g. PT30M means 30 minutes)

A more readable format where the value and the unit are coupled (e.g. 10s means 10 seconds)

Available implementations

There are eight implementations provided:

ImplementationData Storage
ConsulRateLimiterConsul
RedisRateLimiterRedis
SpringDataRateLimiterSpring Data
Bucket4jJCacheRateLimiterBucket4j
Bucket4jHazelcastRateLimiter
Bucket4jIgniteRateLimiter
Bucket4jInfinispanRateLimiter

Bucket4j implementations require the relevant bean with @Qualifier("RateLimit"):

JCache - javax.cache.Cache

Hazelcast - com.hazelcast.map.IMap

Ignite - org.apache.ignite.IgniteCache

Infinispan - org.infinispan.functional.ReadWriteMap

Common application properties

Property namespace: zuul.ratelimit

Property nameValuesDefault Value
enabledtrue/falsefalse
behind-proxytrue/falsefalse
response-headersNONE, STANDARD, VERBOSEVERBOSE
key-prefixString${spring.application.name:rate-limit-application}
repositoryCONSUL, REDIS, JPA, BUCKET4J_JCACHE, BUCKET4J_HAZELCAST, BUCKET4J_INFINISPAN, BUCKET4J_IGNITE-
deny-requestDenyRequest-
default-policy-listList of Policy-
policy-listMap of Lists of Policy-
postFilterOrderintFilterConstants.SEND_RESPONSE_FILTER_ORDER - 10
preFilterOrderintFilterConstants.FORM_BODY_WRAPPER_FILTER_ORDER

Deny Request properties

Property nameValuesDefault Value
originslist of origins to have the access denied-
response-status-codethe http status code to be returned on a denied request403 (FORBIDDEN)

Policy properties:

Property nameValuesDefault Value
limitnumber of requests-
quotatime of requests-
refresh-intervalseconds60
type[ORIGIN, USER, URL, URL_PATTERN, ROLE, HTTP_METHOD, HTTP_HEADER][]
breakOnMatchtrue/falsefalse

Further Customization

This section details how to add custom implementations

Key Generator

If the application needs to control the key strategy beyond the options offered by the type property then it can be done just by creating a custom RateLimitKeyGenerator bean[1] implementation adding further qualifiers or something entirely different:

  @Bean
  public RateLimitKeyGenerator ratelimitKeyGenerator(RateLimitProperties properties, RateLimitUtils rateLimitUtils) {
      return new DefaultRateLimitKeyGenerator(properties, rateLimitUtils) {
          @Override
          public String key(HttpServletRequest request, Route route, RateLimitProperties.Policy policy) {
              return super.key(request, route, policy) + ":" + request.getMethod();
          }
      };
  }

Error Handling

This framework uses 3rd party applications to control the rate limit access and these libraries are out of control of this framework. If one of the 3rd party applications fails, the framework will handle this failure in the DefaultRateLimiterErrorHandler class which will log the error upon failure.

If there is a need to handle the errors differently, it can be achieved by defining a custom RateLimiterErrorHandler bean[2], e.g:

  @Bean
  public RateLimiterErrorHandler rateLimitErrorHandler() {
    return new DefaultRateLimiterErrorHandler() {
        @Override
        public void handleSaveError(String key, Exception e) {
            // custom code
        }

        @Override
        public void handleFetchError(String key, Exception e) {
            // custom code
        }

        @Override
        public void handleError(String msg, Exception e) {
            // custom code
        }
    }
  }

Event Handling

If the application needs to be notified when a rate limit access was exceeded then it can be done by listening to RateLimitExceededEvent event:

    @EventListener
    public void observe(RateLimitExceededEvent event) {
        // custom code
    }

Contributing

Spring Cloud Zuul Rate Limit is released under the non-restrictive Apache 2.0 license, and follows a very standard Github development process, using Github tracker for issues and merging pull requests into master. If you want to contribute even something trivial please do not hesitate, but follow the guidelines below.

Download Details:
Author: marcosbarbero
Source Code: https://github.com/marcosbarbero/spring-cloud-zuul-ratelimit
License: Apache-2.0 License

#spring  #spring-boot  #java 

Mathew Rini

1615544450

How to Select and Hire the Best React JS and React Native Developers?

Since March 2020 reached 556 million monthly downloads have increased, It shows that React JS has been steadily growing. React.js also provides a desirable amount of pliancy and efficiency for developing innovative solutions with interactive user interfaces. It’s no surprise that an increasing number of businesses are adopting this technology. How do you select and recruit React.js developers who will propel your project forward? How much does a React developer make? We’ll bring you here all the details you need.

What is React.js?

Facebook built and maintains React.js, an open-source JavaScript library for designing development tools. React.js is used to create single-page applications (SPAs) that can be used in conjunction with React Native to develop native cross-platform apps.

React vs React Native

  • React Native is a platform that uses a collection of mobile-specific components provided by the React kit, while React.js is a JavaScript-based library.
  • React.js and React Native have similar syntax and workflows, but their implementation is quite different.
  • React Native is designed to create native mobile apps that are distinct from those created in Objective-C or Java. React, on the other hand, can be used to develop web apps, hybrid and mobile & desktop applications.
  • React Native, in essence, takes the same conceptual UI cornerstones as standard iOS and Android apps and assembles them using React.js syntax to create a rich mobile experience.

What is the Average React Developer Salary?

In the United States, the average React developer salary is $94,205 a year, or $30-$48 per hour, This is one of the highest among JavaScript developers. The starting salary for junior React.js developers is $60,510 per year, rising to $112,480 for senior roles.

* React.js Developer Salary by Country

  • United States- $120,000
  • Canada - $110,000
  • United Kingdom - $71,820
  • The Netherlands $49,095
  • Spain - $35,423.00
  • France - $44,284
  • Ukraine - $28,990
  • India - $9,843
  • Sweden - $55,173
  • Singapore - $43,801

In context of software developer wage rates, the United States continues to lead. In high-tech cities like San Francisco and New York, average React developer salaries will hit $98K and $114per year, overall.

However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.

It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.

As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.

How to Hire React.js Developers?

  • Conduct thorough candidate research, including portfolios and areas of expertise.
  • Before you sit down with your interviewing panel, do some homework.
  • Examine the final outcome and hire the ideal candidate.

Why is React.js Popular?

React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.

React is scalable. it utilises a single language, For server-client side, and mobile platform.

React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.

React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.

Is there a market for React.js programmers?
The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.

Final thoughts:

As you’ve seen, locating and Hire React js Developer and Hire React Native developer is a difficult challenge. You will have less challenges selecting the correct fit for your projects if you identify growing offshore locations (e.g. India) and take into consideration the details above.

If you want to make this process easier, You can visit our website for more, or else to write a email, we’ll help you to finding top rated React.js and React Native developers easier and with strives to create this operation

#hire-react-js-developer #hire-react-native-developer #react #react-native #react-js #hire-react-js-programmer

Franz  Becker

Franz Becker

1651604400

React Starter Kit: Build Web Apps with React, Relay and GraphQL.

React Starter Kit — "isomorphic" web app boilerplate   

React Starter Kit is an opinionated boilerplate for web development built on top of Node.js, Express, GraphQL and React, containing modern web development tools such as Webpack, Babel and Browsersync. Helping you to stay productive following the best practices. A solid starting point for both professionals and newcomers to the industry.

See getting started guide, demo, docs, roadmap  |  Join #react-starter-kit chat room on Gitter  |  Visit our sponsors:

 

Hiring

Getting Started

Customization

The master branch of React Starter Kit doesn't include a Flux implementation or any other advanced integrations. Nevertheless, we have some integrations available to you in feature branches that you can use either as a reference or merge into your project:

You can see status of most reasonable merge combination as PRs labeled as TRACKING

If you think that any of these features should be on master, or vice versa, some features should removed from the master branch, please let us know. We love your feedback!

Comparison

 

React Starter Kit

React Static Boilerplate

ASP.NET Core Starter Kit

App typeIsomorphic (universal)Single-page applicationSingle-page application
Frontend
LanguageJavaScript (ES2015+, JSX)JavaScript (ES2015+, JSX)JavaScript (ES2015+, JSX)
LibrariesReact, History, Universal RouterReact, History, ReduxReact, History, Redux
RoutesImperative (functional)DeclarativeDeclarative, cross-stack
Backend
LanguageJavaScript (ES2015+, JSX)n/aC#, F#
LibrariesNode.js, Express, Sequelize,
GraphQL
n/aASP.NET Core, EF Core,
ASP.NET Identity
SSRYesn/an/a
Data APIGraphQLn/aWeb API

Backers

♥ React Starter Kit? Help us keep it alive by donating funds to cover project expenses via OpenCollective or Bountysource!

lehneres Tarkan Anlar Morten Olsen Adam David Ernst Zane Hitchcox  

How to Contribute

Anyone and everyone is welcome to contribute to this project. The best way to start is by checking our open issues, submit a new issue or feature request, participate in discussions, upvote or downvote the issues you like or dislike, send pull requests.

Learn More

Related Projects

  • GraphQL Starter Kit — Boilerplate for building data APIs with Node.js, JavaScript (via Babel) and GraphQL
  • Membership Database — SQL schema boilerplate for user accounts, profiles, roles, and auth claims
  • Babel Starter Kit — Boilerplate for authoring JavaScript/React.js libraries

Support

License

Copyright © 2014-present Kriasoft, LLC. This source code is licensed under the MIT license found in the LICENSE.txt file. The documentation to the project is licensed under the CC BY-SA 4.0 license.


Author: kriasoft
Source Code: https://github.com/kriasoft/react-starter-kit
License: MIT License

#graphql #react