Zachary Palmer

Zachary Palmer

1560845420

Drag and Drop with React

Are you curious how to use drag and drop with React? If so, this article is exactly for you! Have a good read.

Modern web applications have multiple forms of interaction. Among those, drag and drop is, certainly, one of the most appealing to the user. Apps such as Trello, Google Drive, Office 365 and Jira make heavy use of DnD and users simply love it.

Our example component

To illustrate this article, we’ll implement a jigsaw puzzle in React. The puzzle consists of two boards: the first one with the pieces shuffled, the second one with no pieces and the original image in the background.

The pieces

This is the original image of our puzzle:

We need to split it in multiple pieces. I think 40 is an optimal number, given the proportion of this image:

Then, we save all assets in the images folder:

Now we need to save the original image (non-splitted) in this same folder:

Tip: You don’t need to split the sample image by yourself. Just take a look at this sandbox and you’ll find all needed images right there.

The component’s state

After that, let’s create our component basic structure:

import React, { Component } from 'react';
import originalImage from './images/ny_original.jpg';
import './App.css';

class Jigsaw extends Component {
  state = {
    pieces: [],
    shuffled: [],
    solved: []
  };

  // ...
}

In the above code, we’ve defined the component’s state. It has three arrays:

  1. The pieces array will store objects containing data for each piece of our puzzle.
  2. The shuffled array represents the board where every piece will start at, all shuffled.
  3. The solved array represents the board where all pieces will be dragged to, in the correct order.

Once we’ve defined the structure of our component’s state, we need to set the initial values of each array. We can do this in the componentDidMount lifecycle method:

componentDidMount() {
  const pieces = [...Array(40)]
    .map((_, i) => (
      {
        img: `ny_${('0' + (i + 1)).substr(-2)}.jpg`,
        order: i,
        board: 'shuffled'
      }
    ));

  this.setState({
    pieces,
    shuffled: this.shufflePieces(pieces),
    solved: [...Array(40)]
  });
}

In the above snippet, we’ve initialized the three arrays of our component’s state. Did you notice the […Array(40)] part? We use it twice in this method. It’s leveraging the spread operator to create an iterable array with 40 items.

Each item of the pieces array is an object containing three properties:

  1. The pieces array will store objects containing data for each piece of our puzzle.
  2. The shuffled array represents the board where every piece will start at, all shuffled.
  3. The solved array represents the board where all pieces will be dragged to, in the correct order.

To initialize the shuffled array, we’ve created a shufflePieces method. It randomizes the items of a given array by using the Durstenfeld shuffle algorithm:

shufflePieces(pieces) {
  const shuffled = [...pieces];

  for (let i = shuffled.length - 1; i > 0; i--) {
    let j = Math.floor(Math.random() * (i + 1));
    [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];
  }

  return shuffled;
}

Note: You don’t really need to understand this algorithm for the purpose of this article, but if you’re curious to know how it works, here’s a detailed explanation.

The render method

Now let’s see how the render method for this component looks like:

render() {
  return (
    <div className="jigsaw">
      <ul className="jigsaw__shuffled-board">
        {
          this.state.shuffled.map((piece, i) =>
          this.renderPieceContainer(piece, i, 'shuffled'))
        }
      </ul>
      <ol className="jigsaw__solved-board" style={{ backgroundImage: `url(${originalImage})` }}>
        {
          this.state.solved.map((piece, i) =>
          this.renderPieceContainer(piece, i, 'solved'))
        }
      </ol>
    </div>
  );
}

As you can see, we create two lists, one for each board. The piece’s rendering logic was extracted to a separate method. Here it is:

renderPieceContainer(piece, index, boardName) {
  return (
    <li key={index}>
      {piece && <img src={require(`./images/${piece.img}`)}/>}
    </li>
  );
}

This method uses short circuit evaluation to render the piece image conditionally.

I’ve added some styling to make it look nice. In this article, I won’t cover how it was made, but you can find the complete CSS file in this sandbox.

And here’s how our component looks:

It looks good. Doesn’t it? However, it does nothing for now. The next step is to implement the drag and drop logic itself.

Drag and drop: first things first

To make it possible to drag a piece, we need to mark it with a special attribute called draggable:

renderPieceContainer(piece, index, boardName) {
  return (
    <li key={index}>
      {
        piece && <img
          draggable
          src={require(`./images/${piece.img}`)}/>
      }
    </li>
  );
}

After that, we need to create a handler for the onDragStart event of our pieces:

piece && <img
  draggable
  onDragStart={(e) => this.handleDragStart(e, piece.order)}
  src={require(`./images/${piece.img}`)}/>


And here’s the handler itself:

handleDragStart(e, order) {
  e.dataTransfer.setData('text/plain', order);
}

This is what the above snippets do:

  1. The pieces array will store objects containing data for each piece of our puzzle.
  2. The shuffled array represents the board where every piece will start at, all shuffled.
  3. The solved array represents the board where all pieces will be dragged to, in the correct order.

The drag part is done. But dragging a piece is useless if you have no place to drop it. The first thing to do in order to make pieces droppable is to define a handler for the onDragOver event of our piece containers (the li tags of both lists). This handler will be very simple. So simple that, in fact, we can define it inline:

renderPieceContainer(piece, index, boardName) {
  return (
    <li key={index}
      onDragOver={(e) => e.preventDefault()}>

  // ...
}

By default, most zones of a page won’t be a valid dropping place. This is the reason why the normal behavior of the onDragOver event is to disallow dropping. To overcome this, we’re calling the event.preventDefault() method.

Drag and drop: let’s finally drop it!

Finally, let’s implement the dropping logic. To do this, we must define a handler for the onDrop event of our piece containers:

renderPieceContainer(piece, index, boardName) {
  return (
    <li
      key={index}
      onDragOver={(e) => e.preventDefault()}
      onDrop={(e) => this.handleDrop(e, index, boardName)}>

    // ...
}

Now, the handler code:

handleDrop(e, index, targetName) {
  let target = this.state[targetName];
  if (target[index]) return;

  const pieceOrder = e.dataTransfer.getData('text');
  const pieceData = this.state.pieces.find(p => p.order === +pieceOrder);
  const origin = this.state[pieceData.board];

  if (targetName === pieceData.board) target = origin;
  origin[origin.indexOf(pieceData)] = undefined;
  target[index] = pieceData;
  pieceData.board = targetName;
  this.setState({ [pieceData.board]: origin, [targetName]: target })
}

Let’s understand what’s happening here:

  1. The pieces array will store objects containing data for each piece of our puzzle.
  2. The shuffled array represents the board where every piece will start at, all shuffled.
  3. The solved array represents the board where all pieces will be dragged to, in the correct order.

And here’s the puzzle working:

Take a look at the final sandbox.

Conclusion

  • To make an element draggable, mark it with the draggable attribute.
  • Use the onDragStart event to store data for uniquely identifying the item being dragged.
  • By default, most areas of a page won’t allow dropping. To fix this, define a handler for the onDragOver event and call the event.preventDefault() method inside it.
  • Finally, to finish the dropping process, create a handler for the onDrop event. In this method, update your component’s state to reflect the desired dropping behavior.

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Drag and Drop with 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

Nina Diana

Nina Diana

1578050760

10 Best Vue Drag and Drop Component For Your App

Vue Drag and drop is a feature of many interactive web apps. It provides an intuitive way for users to manipulate their data. Adding drag and drop feature is easy to add to Vue.js apps.

Here are 10 vue drop components that contribute to the flexibility of your vue application.

1. Vue.Draggable

Vue component (Vue.js 2.0) or directive (Vue.js 1.0) allowing drag-and-drop and synchronization with view model array.

Based on and offering all features of Sortable.js

Vue.Draggable

Demo: https://sortablejs.github.io/Vue.Draggable/#/simple

Download: https://github.com/SortableJS/Vue.Draggable/archive/master.zip

2. realtime-kanban-vue

Real-time kanban board built with Vue.js and powered by Hamoni Sync.

realtime-kanban-vue

Demo: https://dev.to/pmbanugo/real-time-kanban-board-with-vuejs-and-hamoni-sync-52kg

Download: https://github.com/pmbanugo/realtime-kanban-vue/archive/master.zip

3. vue-nestable

Drag & drop hierarchical list made as a vue component.

Goals

  • A simple vue component to create a draggable list to customizable items
  • Reorder items by dragging them above an other item
  • Intuitively nest items by dragging right
  • Fully customizable, ships with no css
  • Everything is configurable: item identifier, max nesting level, threshold for nesting

vue-nestable

Demo: https://rhwilr.github.io/vue-nestable/

Download: https://github.com/rhwilr/vue-nestable/archive/master.zip

4. VueDraggable

VueJS directive for drag and drop.

Native HTML5 drag and drop implementation made for VueJS.

VueDraggable

Demo: https://vivify-ideas.github.io/vue-draggable/

Download: https://github.com/Vivify-Ideas/vue-draggable/archive/master.zip

5. vue-grid-layout

vue-grid-layout is a grid layout system, like Gridster, for Vue.js. Heavily inspired in React-Grid-Layout

vue-grid-layout

Demo: https://jbaysolutions.github.io/vue-grid-layout/examples/01-basic.html

Download: https://github.com/jbaysolutions/vue-grid-layout/archive/master.zip

6. vue-drag-tree

It’s a tree components(Vue2.x) that allow you to drag and drop the node to exchange their data .

Feature

  • Double click on an node to turn it into a folder
  • Drag and Drop the tree node, even between two different levels
  • Controls whether a particular node can be dragged and whether the node can be plugged into other nodes
  • Append/Remove Node in any level (#TODO)

vue-drag-tree

Demo: https://vigilant-curran-d6fec6.netlify.com/#/

Download: https://github.com/shuiRong/vue-drag-tree/archive/master.zip

7. VueDragDrop

A Simple Drag & Drop example created in Vue.js.

VueDragDrop

Demo: https://seregpie.github.io/VueDragDrop/

Download: https://github.com/SeregPie/VueDragDrop/archive/master.zip

8. Vue-drag-resize

Vue Component for resize and drag elements.

Vue-drag-resize

Demo: http://kirillmurashov.com/vue-drag-resize/

Download: https://github.com/kirillmurashov/vue-drag-resize/archive/master.zip

9. vue-smooth-dnd

A fast and lightweight drag&drop, sortable library for Vue.js with many configuration options covering many d&d scenarios.

This library consists wrapper Vue.js components over smooth-dnd library.

Show, don’t tell !

vue-smooth-dnd

Demo: https://kutlugsahin.github.io/vue-smooth-dnd/#/cards

Download: https://github.com/kutlugsahin/vue-smooth-dnd/archive/master.zip

10. vue-dragula

Drag and drop so simple it hurts

vue-dragula

Demo: http://astray-git.github.io/vue-dragula/

Download: https://github.com/Astray-git/vue-dragula/archive/master.zip

#vue #vue-drag #vue-drop #drag-and-drop #vue-drag-and-drop

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

What are hooks in React JS? - INFO AT ONE

In this article, you will learn what are hooks in React JS? and when to use react hooks? React JS is developed by Facebook in the year 2013. There are many students and the new developers who have confusion between react and hooks in react. Well, it is not different, react is a programming language and hooks is a function which is used in react programming language.
Read More:- https://infoatone.com/what-are-hooks-in-react-js/

#react #hooks in react #react hooks example #react js projects for beginners #what are hooks in react js? #when to use react hooks

Aria Barnes

Aria Barnes

1627031571

React 18: Things You Need To Know About React JS Latest Version

The most awaited version of React 18 is finally out now. Its team has finally revealed the alpha version of React 18 and its plan, though the official launch is still pending. This time the team has tried something and released the plan first to know their user feedback because the last version of React 17 was not that much appreciated among developers.

According to Front-end Frameworks SurveyReact JS has ranked top in the list of most loved frameworks. Thus, the developer communities expect a bit higher from the framework, so they are less appreciative of the previous launch.
ReactJS stats.pngSo, this time React 18 will be a blast. For beginners, the team is working on a new approach. They have called a panel of experts, library authors, educators, and developers to take part in a working group. Initially, it will be a small group.

I am not a part of this release but following the team on their GitHub discussion group. After gathering the information from there, I can say that they have planned much better this time.

React 17 was not able to meet the developer's community. The focus was all primarily centered on making it easier to upgrade React itself. React 18 release will be the opposite. It has a lot of features for react developers.

Read more here: React 18: Things You Need To Know About React JS Latest Version

#hire react js developers #hire react js developers india #react developers india #react js developer #react developer #hire react developers