1640107860
Cách tải tệp lên trong ứng dụng React
Có thể bạn chưa từng xử lý việc tải lên tệp trong React hoặc bất kỳ công nghệ nào khác, nhưng có khả năng cao là bạn sẽ gặp phải nhu cầu đó, cho dù tor cập nhật ảnh hồ sơ của người dùng, tệp CSV hay PDF, đề cập đến nhưng một số ít. Trong hướng dẫn này, bạn sẽ học cách tải tệp lên trong ứng dụng React của mình.
Thiết lập ứng dụng
Để bắt đầu, hãy chạy lệnh sau trong thiết bị đầu cuối của bạn hoặc truy cập https://react.new để có được môi trường phát triển React được định cấu hình đầy đủ qua https://codesandbox.io .
npx create-react-app <YOUR_APP_NAME><YOUR_APP_NAME> đề cập đến tên ứng dụng ưa thích của bạn.
Tiếp theo, tạo một thành phần đơn giản có đầu vào tệp bằng nút tải lên.
import React from 'react';
function FileUploadPage(){
return(
<div>
<input type="file" name="file" onChange={changeHandler} />
<div>
<button onClick={handleSubmission}>Submit</button>
</div>
</div>
)
}Thêm tiểu bang
Bây giờ, hãy thêm một số trạng thái vào ứng dụng của bạn để chứa thông tin về tệp được người dùng chọn.
import React, {useState} from 'react';
function FileUploadPage(){
const [selectedFile, setSelectedFile] = useState();
const [isFilePicked, setIsFilePicked] = useState(false);
return(
<div>
<input type="file" name="file" onChange={changeHandler} />
<div>
<button onClick={handleSubmission}>Submit</button>
</div>
</div>
)
}selectedFile chứa thông tin về tệp hiện được chọn.
isFilePicked xác định xem một tập tin đã được chọn hay chưa.
Bây giờ triển khai trình xử lý sự kiện handleSubmissionvà changeHandler, sau đó thêm điều kiện để hiển thị chi tiết của tệp hiện được chọn ở trạng thái.
import React, {useState} from 'react';
function FileUploadPage(){
const [selectedFile, setSelectedFile] = useState();
const [isFilePicked, setIsFilePicked] = useState(false);
const changeHandler = (event) => {
setSelectedFile(event.target.files[0]);
setIsSelected(true);
};
const handleSubmission = () => {
};
return(
<div>
<input type="file" name="file" onChange={changeHandler} />
<div>
<button onClick={handleSubmission}>Submit</button>
</div>
</div>
)
}Event.target.files là một đối tượng chứa thông tin chi tiết của các tệp được chọn để tải lên trong một biểu mẫu.
Đối tượng tệp hiện đang được chọn cũng trông như sau.
{
lastModified: 1588350162449
lastModifiedDate: Fri May 01 2020 17:22:42 GMT+0100 (British Summer Time) {} // Date object
name: "Pluralsight_logo.png"
size: 68317
type: "image/png"
webkitRelativePath: ""
__proto__: File
}Bây giờ hãy thêm logic hiển thị có điều kiện để cung cấp cho người dùng thông tin chi tiết của tệp.
import React, {useState} from 'react';
function FileUploadPage(){
const [selectedFile, setSelectedFile] = useState();
const [isFilePicked, setIsFilePicked] = useState(false);
const changeHandler = (event) => {
setSelectedFile(event.target.files[0]);
setIsSelected(true);
};
const handleSubmission = () => {
};
return(
<div>
<input type="file" name="file" onChange={changeHandler} />
{isSelected ? (
<div>
<p>Filename: {selectedFile.name}</p>
<p>Filetype: {selectedFile.type}</p>
<p>Size in bytes: {selectedFile.size}</p>
<p>
lastModifiedDate:{' '}
{selectedFile.lastModifiedDate.toLocaleDateString()}
</p>
</div>
) : (
<p>Select a file to show details</p>
)}
<div>
<button onClick={handleSubmission}>Submit</button>
</div>
</div>
)
}Tải lên tệp bằng tính năng Tìm nạp
API tìm nạp có thể được sử dụng để triển khai tải lên tệp hoặc bạn cũng có thể sử dụng thư viện như Axios để triển khai logic tải lên. Triển khai onClicktrình xử lý, như được hiển thị bên dưới, để xử lý việc tải lên tệp.
Có một dịch vụ miễn phí cho phép tải tệp lên qua API của họ, vì vậy hãy tiếp tục và đăng ký tại đây để nhận khóa API.
import React, {useState} from 'react';
function FileUploadPage(){
const [selectedFile, setSelectedFile] = useState();
const [isFilePicked, setIsFilePicked] = useState(false);
const changeHandler = (event) => {
setSelectedFile(event.target.files[0]);
setIsSelected(true);
};
const handleSubmission = () => {
const formData = new FormData();
formData.append('File', selectedFile);
fetch(
'https://freeimage.host/api/1/upload?key=<YOUR_API_KEY>',
{
method: 'POST',
body: formData,
}
)
.then((response) => response.json())
.then((result) => {
console.log('Success:', result);
})
.catch((error) => {
console.error('Error:', error);
});
};
};
return(
<div>
<input type="file" name="file" onChange={changeHandler} />
{isSelected ? (
<div>
<p>Filename: {selectedFile.name}</p>
<p>Filetype: {selectedFile.type}</p>
<p>Size in bytes: {selectedFile.size}</p>
<p>
lastModifiedDate:{' '}
{selectedFile.lastModifiedDate.toLocaleDateString()}
</p>
</div>
) : (
<p>Select a file to show details</p>
)}
<div>
<button onClick={handleSubmission}>Submit</button>
</div>
</div>
)
}Điều gì đã xảy ra ở đây? Bạn đã sử dụng API tìm nạp cùng với API Javascript gốc của FormData để đăng tệp lên máy chủ tệp.
Một bài đăng thành công đến máy chủ sẽ dẫn đến phản hồi sau.
{
"status_code": 200,
"success": {
"message": "image uploaded",
"code": 200
},
"image": {
"name": "example",
"extension": "png",
"size": 53237,
"width": 1151,
"height": 898,
"date": "2020-11-11 15:32:33",
"date_gmt": "2020-11-11 19:32:33",
"storage_id": null,
"description": null,
"nsfw": "0",
"md5": "d973298h0d722c956c3629870299735830",
"storage": "datefolder",
"original_filename": "pluralsight_logo.png",
"original_exifdata": null,
"views": "0",
"id_encoded": "L",
"filename": "pluralsight_logo.png",
"ratio": 1.2817371937639,
"size_formatted": "52 KB",
"mime": "image/png",
"bits": 8,
"channels": null,
"url": "http://freeimage.host/images/2020/11/11/pluralsight_logo.png",
"url_viewer": "http://freeimage.host/image/L",
"thumb": {
"filename": "example.th.png",
"name": "example.th",
"width": 160,
"height": 160,
"ratio": 1,
"size": 17848,
"size_formatted": "17.4 KB",
"mime": "image/png",
"extension": "png",
"bits": 8,
"channels": null,
"url": "http://freeimage.host/images/2020/11/11/pluralsight_logo.th.png"
},
"medium": {
"filename": "pluralsight_logo.md.png",
"name": "pluralsight_logo.md",
"width": 500,
"height": 390,
"ratio": 1.2820512820513,
"size": 104448,
"size_formatted": "102 KB",
"mime": "image/png",
"extension": "png",
"bits": 8,
"channels": null,
"url": "http://freeimage.host/images/2020/11/11/pluralsight_logo.md.png"
},
"views_label": "views",
"display_url": "http://freeimage.host/images/2020/11/11/pluralsight_logo.md.png",
"how_long_ago": "moments ago"
},
"status_txt": "OK"
}Kết Luận
Và đó là một bọc. Trong hướng dẫn này, bạn đã học cách tải tệp lên bằng React và cách sử dụng API Tìm nạp để tải tệp lên.
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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
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
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:
Getting Started
- Follow the getting started guide to download and run the project (Node.js >= 8.16.2)
- Check the code recipes used in this boilerplate, or share yours
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:
- feature/redux (PR) — isomorphic Redux by Pavel Lang (see how to integrate Redux) (based on
master) - feature/apollo (PR) — isomorphic Apollo Client by Pavel Lang (see Tracking PR #1147) (based on
feature/redux) - feature/react-intl (PR) — isomorphic Redux and React Intl by Pavel Lang (see how to integrate React Intl) (based on
feature/apollo) - feature/apollo-pure (PR) — Apollo devtools and TypeScript integration by piglovesyou (based on
master)
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 type | Isomorphic (universal) | Single-page application | Single-page application |
| Frontend | |||
| Language | JavaScript (ES2015+, JSX) | JavaScript (ES2015+, JSX) | JavaScript (ES2015+, JSX) |
| Libraries | React, History, Universal Router | React, History, Redux | React, History, Redux |
| Routes | Imperative (functional) | Declarative | Declarative, cross-stack |
| Backend | |||
| Language | JavaScript (ES2015+, JSX) | n/a | C#, F# |
| Libraries | Node.js, Express, Sequelize, GraphQL | n/a | ASP.NET Core, EF Core, ASP.NET Identity |
| SSR | Yes | n/a | n/a |
| Data API | GraphQL | n/a | Web API |
Backers
♥ React Starter Kit? Help us keep it alive by donating funds to cover project expenses via OpenCollective or Bountysource!
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
- Getting Started with React.js
- Getting Started with GraphQL and Relay
- React.js Questions on StackOverflow
- React.js Discussion Board
- Flux Architecture for Building User Interfaces
- Enzyme — JavaScript Testing utilities for React
- Flow — A static type checker for JavaScript
- The Future of React
- Learn ES6, ES6 Features
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
- #react-starter-kit on Stack Overflow — Questions and answers
- #react-starter-kit on Gitter — Watch announcements, share ideas and feedback
- GitHub issues, or Scrum board — File issues, send feature requests
- appear.in/react — Open hours! Exchange ideas and experiences (React, GraphQL, startups and pet projects)
- @koistya on Codementor, or Skype — Private consulting
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
1621573085
React Native App Developers India, React Native App Development Company
Expand your user base by using react-native apps developed by our expert team for various platforms like Android, Android TV, iOS, macOS, tvOS, the Web, Windows, and UWP.
We help businesses to scale up the process and achieve greater performance by providing the best react native app development services. Our skilled and experienced team’s apps have delivered all the expected results for our clients across the world.
To achieve growth for your business, hire react native app developers in India. You can count on us for all the technical services and support.
#react native app development company india #react native app developers india #hire react native developers india #react native app development company #react native app developers #hire react native developers
1607768450
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