Getting started with the reactjs, basics of reactjs, introduction of reactjs, core concepts of reactjs and comparison with the other libraries/frameworks
React js is a free and open-source front-end JavaScript library for building user interfaces based on UI components. It allows creating reusable UI components that can be nested to build complex applications. A React component may maintain internal state and re-render when data changes. React uses a declarative paradigm that makes code more predictable and easier to debug.
To use React, install Node packages and create a new project using create-react-app. Components let you break up the UI into reusable pieces responsible for rendering HTML. Components can be stateful class components or stateless function components. Components can be created using ES6 class syntax or function syntax and can be nested. Choosing between class and function depends on requirements like using
This document contains an agenda and slides for a React workshop presented by Bojan Golubovic. The workshop covers the history and basics of React, including components, JSX, the virtual DOM, and React data flow. It also discusses related tools like Redux and React Router. The goal is to provide basic knowledge of React and how to build real-world applications with it.
This document provides an introduction to React.js, including:
- React is a JavaScript library for building user interfaces and was developed by Facebook. It is the VIEW component in MVC architecture.
- Key features and benefits of React include being fast, modular, scalable, flexible, and popular due to its employability. Large companies like Facebook use React.
- Core concepts of React include JSX, components, unidirectional data flow, and the virtual DOM which improves performance compared to traditional frameworks. Components are reusable pieces that make up the entire application.
Introduction to React JS for beginners | Namespace ITnamespaceit
React is a JavaScript library for building user interfaces using reusable components. It is used to create single page applications that dynamically update the current page with new data from the server. React uses a component-based approach and one-way data binding to build interfaces simply and allow for easy testing. Key concepts in React include components, props, state, lifecycles, hooks, JSX, and the virtual DOM. Major companies using React include Facebook, Netflix, Instagram, and WhatsApp.
The document provides an introduction to React, a JavaScript library for building user interfaces. It discusses key React concepts like components, properties, state, one-way data flow, and JSX syntax. It also covers setting up a development environment with Create React App and shows how to create a basic React component with state. The target audience appears to be people new to React who want to learn the fundamentals.
In this presentation, Prashant Sharma of Valuebound has talked about ReactJS - a JavaScript library for building user interfaces. Check out the agendas to know what is there for you.
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- React is a JavaScript library for building user interfaces that uses a virtual DOM for faster re-rendering on state changes.
- Everything in React is a component that can have states, props, and lifecycle methods like render(). Components return JSX elements.
- Props are used for passing data to components in a unidirectional flow, while states allow components to re-render on changes.
- The render() method returns the view, accessing props and state values. Forms and events also follow React conventions.
React is a JavaScript library created by Facebook and Instagram to build user interfaces. It allows developers to create fast user interfaces easily through components. React uses a virtual DOM to update the real DOM efficiently. Some major companies that use React include Facebook, Yahoo!, Airbnb, and Instagram. React is not a complete framework but rather just handles the view layer. It uses a one-way data binding model and components to build user interfaces.
React is a JavaScript library for building user interfaces. It was created by Facebook and is best for building dynamic websites like chat applications. React uses a virtual DOM for efficiently updating the view after data changes. Components are the building blocks of React and can contain state and props. The document provides an example of a simple component class and demonstrates how to add state and props. It also includes links to example code and MicroPyramid's social media profiles.
React JS is a JavaScript library for building user interfaces. It uses a virtual DOM to efficiently update the real DOM and render user interfaces from components. Components are reusable pieces of UI that accept input data via properties but maintain private state data. The lifecycle of a component involves initialization, updating due to state/prop changes, and unmounting. React uses a single-directional data flow and the concept of components makes code modular and reusable.
ReactJS is arguably the most popular Javascript framework around for web development today. With more and more teams exploring and adopting React, here is TechTalks presentation elaborating fundamentals of React, in a code along session
This document provides an introduction to React.js, including:
- React.js uses a virtual DOM for improved performance over directly manipulating the real DOM. Components are used to build up the UI and can contain state that updates the view on change.
- The Flux architecture is described using React with unidirectional data flow from Actions to Stores to Views via a Dispatcher. This ensures state changes in a predictable way.
- Setting up React with tools like Browserify/Webpack for module bundling is discussed, along with additional topics like PropTypes, mixins, server-side rendering and React Native.
This document provides an introduction and overview of Reactjs including:
1. Reactjs core concepts including components, virtual DOM, and JSX
2. React components are self-contained reusable blocks and many companies have open sourced React component libraries
3. The React lifecycle methods for components including initialization, update, and destruction
This document provides an introduction to Redux, including what it is, its core principles and building blocks. Redux is a predictable state container for JavaScript apps that can be used with frameworks like React, Angular and Vue. It follows the Flux architecture pattern and is based on three principles - state is immutable, state can only be changed through actions, and changes are made with pure functions called reducers. The main building blocks are actions, reducers and the store.
React is a library for building user interfaces using components. It uses a virtual DOM for rendering components, which are pieces of UI defined as classes or functions. Components receive data via props and local state, and can be nested to build complex UIs. The component lifecycle includes mounting, updating, and unmounting phases. Data flows unidirectionally down the component tree. React has a vibrant ecosystem and community for continued learning.
The document discusses React's virtual DOM and how it allows for more efficient DOM updates compared to directly manipulating the real DOM. It explains that the virtual DOM is an in-memory representation of the real DOM that allows React to calculate efficient DOM changes before applying them to the real DOM. This avoids unnecessary re-renders and improves performance. It also describes how React uses a diff algorithm and DOM traversal with breadth-first search to determine the minimal number of operations needed to transform the virtual DOM before updating the real DOM in a batched way.
React is a JavaScript library for building user interfaces. It is not a full framework and only handles the view layer. React uses a component-based approach where UI is broken into independent, reusable pieces. Components render HTML and have their own internal state. This makes components predictable and easier to debug. However, React alone is not enough to build full applications and must be used with other libraries for functionality like data fetching and routing. While React takes more time to learn initially, it can improve development speed and code quality for larger teams through its patterns and emphasis on component design.
React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It uses virtual DOM which improves performance and can render on both client and server. React encourages a component-based approach where UI is broken into independent reusable pieces that accept external data through properties. Components manage their own state which allows the UI to update over time in response to user input. This makes React code more predictable and easier to debug than traditional two-way data binding.
React is a JavaScript library for building user interfaces using reusable components. The core concepts of React include JSX, components, unidirectional data flow, and the virtual DOM. Everything in React is components that can interact with each other and maintain state. Data flows unidirectionally via state and props from parent to child components. The virtual DOM selectively re-renders the UI when the state changes, improving performance. Redux follows a similar unidirectional data flow architecture, with data moving from actions to reducers to the store.
React JS; all concepts. Contains React Features, JSX, functional & Class comp...Karmanjay Verma
This ppt contains all concepts of React JS. This contains React Features JSX, functional & Class component, Hooks. PPT includes sample code also for each defination in comment.
For more detail and source code
https://github.com/KPCodeLearning/React-Learning-App
https://kpcodelearning.github.io/React-Learning-App/
https://www.linkedin.com/in/karmanjayverma/
React and Flux life cycle with JSX, React Router and Jest Unit TestingEswara Kumar Palakollu
Understanding of React, JSX, Flux, react-router and Jest for React and Flux Unit Testing.
Detailed view of react life cycle and flux life cycle along with React life cycle.
React with MVC pattern and React + Flux with MVC pattern explained.
ReactJS is a JavaScript library for building user interfaces. It uses a virtual DOM and only updates parts of the real DOM that changed. React uses a component-based architecture where data flows unidirectionally via props and state. Lifecycle methods allow components to handle state changes. Components are built with JSX syntax and can be nested to build up an application from reusable pieces.
At Lia Infraservice we create Dynamic Websites. Become a front-end React JS developer and be a part of our tech-savvy Web App Development Company in Chennai.
Presentation on "An Introduction to ReactJS"Flipkart
The PowerPoint presentation titled "An Introduction to ReactJS" provides a beginner-friendly overview of ReactJS, a popular JavaScript library used for building user interfaces. This presentation aims to introduce ReactJS to individuals who may not have prior technical knowledge or experience with web development.
The presentation begins with a brief introduction to ReactJS, explaining that it is a JavaScript library created by Facebook for building interactive and dynamic user interfaces. It highlights ReactJS's key features, such as component-based architecture and virtual DOM.
Next, the presentation focuses on the benefits of using ReactJS. It explains that ReactJS enhances the user experience by enabling the creation of highly responsive and efficient web applications. It emphasizes React's ability to manage complex UI components and handle data updates seamlessly.
To make the concept more relatable, the presentation provides real-world examples of popular websites and applications that use ReactJS. This helps the audience understand how ReactJS is implemented in real-world scenarios and its impact on user interface development.
Furthermore, the presentation covers the basic concepts of ReactJS, such as components, props, and state. It explains that ReactJS follows a modular approach, where the UI is divided into reusable components, making it easier to manage and update the application. It also gives a high-level overview of how props and state are used to manage data flow within React components.
Throughout the presentation, visual aids such as diagrams, screenshots, and simple illustrations are used to enhance understanding and engage the audience. The focus is on simplifying complex concepts and making them accessible to non-technical individuals.
Finally, the presentation concludes by highlighting the vast community support and resources available for learning ReactJS. It encourages the audience to explore further and provides recommendations for online tutorials, documentation, and learning platforms.
Overall, the "An Introduction to ReactJS" PowerPoint presentation aims to provide a non-technical audience with a basic understanding of ReactJS, its benefits, and its relevance in modern web development.
Mildaintrainings offers advanced ReactJS Interview Questions 2019 that helps you in cracking your interview & acquire your dream career as ReactJS Developer. Visit in this link :- https://mildaintrainings.com/blogs/react-js-interview-questions-answers/
If you want to get trained in React and wish to develop interesting UI’s on your own, then check out the ReactJS with Redux Certification Training by MildainTrainings, a trusted online learning company with a network of more than 50,000 satisfied learners spread across the globe.
This document provides an overview of several core technologies used in React applications, including React, Flux, Node.js, Browserify, and Gulp. It discusses that React is a JavaScript library for building user interfaces and rendering UI as HTML. It uses virtual DOM for efficient updates. Flux is an architecture for uni-directional data flow. Node.js is used for server-side JavaScript with npm. Browserify allows using Node modules in the browser. Gulp is a build system for tasks like bundling files.
1. The document discusses adding React components to ASP.NET MVC applications using React JS.NET.
2. It explains how React JS.NET allows bootstrapping a React component tree from a C# view, allowing ASP.NET MVC apps to contain React component trees.
3. The document provides an overview of key aspects like how ReactDOM.Render() is called, using JSX files, fetching data from server-side MVC code, and rendering components on the server-side for performance.
React JS is a JavaScript library for building reusable UI components. It uses a virtual DOM for efficient rendering. Components are the building blocks of React, and can be either functional or class-based. Functional components are simpler while class components can maintain state. Props are passed down from parent to child components while state is local. The virtual DOM improves performance by only updating the real DOM with actual changes.
This document provides an overview of React, a JavaScript library for building user interfaces. It discusses what React is, why it is useful, when to use it, and its key features and components. React allows building of reusable UI components in a declarative way. It uses a virtual DOM for better performance and can render on both client and server sides. Key advantages include high performance with large data changes, reusability, and ease of building large, complex UIs. The document also provides examples of building a simple React app in steps and references for further information.
React JS is a declarative, efficient, and flexible JavaScript library for building reusable UI components. It uses a virtual DOM which works like a lightweight copy of the real DOM to improve performance by only updating what changes. Components are independent and reusable bits of code that serve the same purpose as functions but return HTML. There are two main types of components - functional components which are simple functions, and class components which can maintain their own state and work together.
React is a JavaScript library for building user interfaces that uses a virtual DOM for improved performance. It uses a one-way data flow and declarative components. The virtual DOM allows React to efficiently update the real DOM by only making necessary changes. Components in React encapsulate elements and can have state and props. JSX is recommended for writing React components and compiles to plain JavaScript.
This document discusses using React and Redux to build an app for managing conferences. It describes building a conference scheduling app with React components to define the UI and Redux to manage shared state. Redux uses a central store with actions and reducers to update the state, which is then mapped to props and passed to React components. Key aspects covered include creating React components, action creators, reducers, connecting React to Redux with the connect function, and rendering the app with a Provider component wrapping the connected components.
This document provides an overview and introduction to React, a JavaScript library for building user interfaces. It discusses why React is used, how to set up a React environment, core React concepts like components, props, state, lifecycles and events. It also introduces React Native for building native mobile apps with React. The document emphasizes learning React through hands-on examples and practice.
This document summarizes a presentation about building modern web parts with React and Redux. It discusses why Microsoft is using React in Office 365 applications and how React combined with Redux helps build single page applications. It provides an overview of React components and state management. It also summarizes the basic principles of Redux, including how data is contained in the application and views are contained separately. The document shares code for an example FAQ web part built with React and Redux and diagrams the overall application structure and data flow.
As applications grow in complexity, web developers and front-end developers all suffer the hassle of building and maintaining complex web applications; managing and maintaining consistency of application state. This presentation goes through what's special about React and Redux.
This was part of JOSA TechTalks project within Jordan Open Source Association, presented by Ali Sa'o and Omar Abdelhafith.
This document discusses progressive web apps (PWAs). It defines PWAs as applications that take advantage of new technologies to provide the best of mobile sites and native apps to users. PWAs are reliable, fast, and engaging. They work across all devices and platforms without installation. Core aspects of PWAs include application shells, web app manifests, and service workers. Major browsers support key PWAs features like caching, adding to home screens, and push notifications. Popular companies using PWAs include Flipkart, Paper Planes, and Housing. The document encourages building and migrating to PWAs.
The document discusses service workers, which are scripts that run in the background of a browser to enable features that do not require a web page or user interaction. Service workers act as a programmable network proxy to control how network requests from web pages are handled, and allow developers to take sites offline or implement push notifications and background syncing. The document provides an overview of how service workers work, what is needed to use them, and suggests additional capabilities like push notifications and background syncing that can be implemented with service workers.
Web components are the future. This is the time to think beyond the modules and start creating your applications components based. These are my slides from the talk I gave in Microsoft Gurgaon at Javascript Sunday organized by JSLovers.
PostCSS is a tool for transforming CSS with JavaScript plugins. It allows developers to write CSS in a more modular fashion and use future CSS syntax today. PostCSS parses CSS into an abstract syntax tree, passes it through plugins for processing, and outputs new CSS. Popular PostCSS plugins include Autoprefixer for adding vendor prefixes, CSSNano for optimization, and CSSNext for future CSS syntax. PostCSS can be used with build tools like Grunt and Gulp and has a large ecosystem of over 200 plugins.
CSS3 Flexbox allows elements to be laid out in a flexible manner to fully fill available space or adapt to different screen sizes and devices. It improves on floats and eliminates some layout problems. Flexbox uses flex items within a flex container, with properties like flex-direction, justify-content, align-items and flex-wrap controlling item alignment along the main and cross axes. Common uses include navigation bars, image galleries, and responsive layouts. Browser support is good with prefixes in older browsers.
SASS (Syntactically Awesome Style Sheets) is a CSS pre-processor that allows for nesting, variables, mixins and other powerful features to help write cleaner, more maintainable CSS. It helps achieve the DRY principle by eliminating repeated code and allowing logical structuring. Some key SASS features include nesting, variables and scopes, mixins, extends and interpolation. SASS files are compiled to normal CSS files for use in browsers. Using SASS can help large development teams work on CSS in a more organized and efficient way.
This document provides an introduction and overview of HTML5. It begins with an agenda that outlines topics like the history of HTML, what HTML5 is, why we need it, new tags in HTML5, and compatibility with Internet Explorer. The document then defines HTML4, XHTML, and HTML5 and explains how HTML5 is the newest version that includes new semantic tags, offline storage, multimedia, and graphics capabilities. It highlights reasons for using HTML5 like improved semantics, new APIs, better interactivity, and performance. The document lists some new tags in HTML5 like header, footer, nav, section, aside, and canvas. It also provides a skeleton of an HTML5 document and discusses using plugins or JavaScript/CSS to
Video traffic on the Internet is constantly growing; networked multimedia applications consume a predominant share of the available Internet bandwidth. A major technical breakthrough and enabler in multimedia systems research and of industrial networked multimedia services certainly was the HTTP Adaptive Streaming (HAS) technique. This resulted in the standardization of MPEG Dynamic Adaptive Streaming over HTTP (MPEG-DASH) which, together with HTTP Live Streaming (HLS), is widely used for multimedia delivery in today’s networks. Existing challenges in multimedia systems research deal with the trade-off between (i) the ever-increasing content complexity, (ii) various requirements with respect to time (most importantly, latency), and (iii) quality of experience (QoE). Optimizing towards one aspect usually negatively impacts at least one of the other two aspects if not both. This situation sets the stage for our research work in the ATHENA Christian Doppler (CD) Laboratory (Adaptive Streaming over HTTP and Emerging Networked Multimedia Services; https://athena.itec.aau.at/), jointly funded by public sources and industry. In this talk, we will present selected novel approaches and research results of the first year of the ATHENA CD Lab’s operation. We will highlight HAS-related research on (i) multimedia content provisioning (machine learning for video encoding); (ii) multimedia content delivery (support of edge processing and virtualized network functions for video networking); (iii) multimedia content consumption and end-to-end aspects (player-triggered segment retransmissions to improve video playout quality); and (iv) novel QoE investigations (adaptive point cloud streaming). We will also put the work into the context of international multimedia systems research.
Sustainability requires ingenuity and stewardship. Did you know Pigging Solutions pigging systems help you achieve your sustainable manufacturing goals AND provide rapid return on investment.
How? Our systems recover over 99% of product in transfer piping. Recovering trapped product from transfer lines that would otherwise become flush-waste, means you can increase batch yields and eliminate flush waste. From raw materials to finished product, if you can pump it, we can pig it.
What Not to Document and Why_ (North Bay Python 2024)Margaret Fero
We’re hopefully all on board with writing documentation for our projects. However, especially with the rise of supply-chain attacks, there are some aspects of our projects that we really shouldn’t document, and should instead remediate as vulnerabilities. If we do document these aspects of a project, it may help someone compromise the project itself or our users. In this talk, you will learn why some aspects of documentation may help attackers more than users, how to recognize those aspects in your own projects, and what to do when you encounter such an issue.
These are slides as presented at North Bay Python 2024, with one minor modification to add the URL of a tweet screenshotted in the presentation.
Transcript: Details of description part II: Describing images in practice - T...BookNet Canada
This presentation explores the practical application of image description techniques. Familiar guidelines will be demonstrated in practice, and descriptions will be developed “live”! If you have learned a lot about the theory of image description techniques but want to feel more confident putting them into practice, this is the presentation for you. There will be useful, actionable information for everyone, whether you are working with authors, colleagues, alone, or leveraging AI as a collaborator.
Link to presentation recording and slides: https://bnctechforum.ca/sessions/details-of-description-part-ii-describing-images-in-practice/
Presented by BookNet Canada on June 25, 2024, with support from the Department of Canadian Heritage.
Hire a private investigator to get cell phone recordsHackersList
Learn what private investigators can legally do to obtain cell phone records and track phones, plus ethical considerations and alternatives for addressing privacy concerns.
Navigating Post-Quantum Blockchain: Resilient Cryptography in Quantum Threatsanupriti
In the rapidly evolving landscape of blockchain technology, the advent of quantum computing poses unprecedented challenges to traditional cryptographic methods. As quantum computing capabilities advance, the vulnerabilities of current cryptographic standards become increasingly apparent.
This presentation, "Navigating Post-Quantum Blockchain: Resilient Cryptography in Quantum Threats," explores the intersection of blockchain technology and quantum computing. It delves into the urgent need for resilient cryptographic solutions that can withstand the computational power of quantum adversaries.
Key topics covered include:
An overview of quantum computing and its implications for blockchain security.
Current cryptographic standards and their vulnerabilities in the face of quantum threats.
Emerging post-quantum cryptographic algorithms and their applicability to blockchain systems.
Case studies and real-world implications of quantum-resistant blockchain implementations.
Strategies for integrating post-quantum cryptography into existing blockchain frameworks.
Join us as we navigate the complexities of securing blockchain networks in a quantum-enabled future. Gain insights into the latest advancements and best practices for safeguarding data integrity and privacy in the era of quantum threats.
Paradigm Shifts in User Modeling: A Journey from Historical Foundations to Em...Erasmo Purificato
Slide of the tutorial entitled "Paradigm Shifts in User Modeling: A Journey from Historical Foundations to Emerging Trends" held at UMAP'24: 32nd ACM Conference on User Modeling, Adaptation and Personalization (July 1, 2024 | Cagliari, Italy)
How Netflix Builds High Performance Applications at Global ScaleScyllaDB
We all want to build applications that are blazingly fast. We also want to scale them to users all over the world. Can the two happen together? Can users in the slowest of environments also get a fast experience? Learn how we do this at Netflix: how we understand every user's needs and preferences and build high performance applications that work for every user, every time.
Scaling Connections in PostgreSQL Postgres Bangalore(PGBLR) Meetup-2 - MydbopsMydbops
This presentation, delivered at the Postgres Bangalore (PGBLR) Meetup-2 on June 29th, 2024, dives deep into connection pooling for PostgreSQL databases. Aakash M, a PostgreSQL Tech Lead at Mydbops, explores the challenges of managing numerous connections and explains how connection pooling optimizes performance and resource utilization.
Key Takeaways:
* Understand why connection pooling is essential for high-traffic applications
* Explore various connection poolers available for PostgreSQL, including pgbouncer
* Learn the configuration options and functionalities of pgbouncer
* Discover best practices for monitoring and troubleshooting connection pooling setups
* Gain insights into real-world use cases and considerations for production environments
This presentation is ideal for:
* Database administrators (DBAs)
* Developers working with PostgreSQL
* DevOps engineers
* Anyone interested in optimizing PostgreSQL performance
Contact info@mydbops.com for PostgreSQL Managed, Consulting and Remote DBA Services
The Rise of Supernetwork Data Intensive ComputingLarry Smarr
Invited Remote Lecture to SC21
The International Conference for High Performance Computing, Networking, Storage, and Analysis
St. Louis, Missouri
November 18, 2021
How RPA Help in the Transportation and Logistics Industry.pptxSynapseIndia
Revolutionize your transportation processes with our cutting-edge RPA software. Automate repetitive tasks, reduce costs, and enhance efficiency in the logistics sector with our advanced solutions.
How to Avoid Learning the Linux-Kernel Memory ModelScyllaDB
The Linux-kernel memory model (LKMM) is a powerful tool for developing highly concurrent Linux-kernel code, but it also has a steep learning curve. Wouldn't it be great to get most of LKMM's benefits without the learning curve?
This talk will describe how to do exactly that by using the standard Linux-kernel APIs (locking, reference counting, RCU) along with a simple rules of thumb, thus gaining most of LKMM's power with less learning. And the full LKMM is always there when you need it!
MYIR Product Brochure - A Global Provider of Embedded SOMs & SolutionsLinda Zhang
This brochure gives introduction of MYIR Electronics company and MYIR's products and services.
MYIR Electronics Limited (MYIR for short), established in 2011, is a global provider of embedded System-On-Modules (SOMs) and
comprehensive solutions based on various architectures such as ARM, FPGA, RISC-V, and AI. We cater to customers' needs for large-scale production, offering customized design, industry-specific application solutions, and one-stop OEM services.
MYIR, recognized as a national high-tech enterprise, is also listed among the "Specialized
and Special new" Enterprises in Shenzhen, China. Our core belief is that "Our success stems from our customers' success" and embraces the philosophy
of "Make Your Idea Real, then My Idea Realizing!"
2. What is React.js?
A JavaScript library for building user interfaces. Reactjs is
created by the Facebook for the V of MVC by reusable and
interactive UI components.
3. Who is using Reactjs?
• Facebook – Partial
• Instagram
• Khan Academy - Partial
4. Why React.js?
• V(view) of MVC - Solution of View in MVC
• Virtual DOM - Reactjs use the concept of virtual DOM which helps in the performance
• Unidirectional Data Flow - Compare to the 2 way data binding. Reactjs use the concept of
Unidirectional data flow which improve the over all performance.
• UI Components - Reusable and interactive components
• SEO Friendly - Components are client side as well as server side render hence they are SEO
friendly and no 3rd party plugin required
• Coding is simpler because of JSX
• Reactjs own debugger
• React Native is going to be next big thing
• Big minds are backing Reactjs
5. Core Concept of Reactjs
Unidirectional
Data Flow
ComponentsJSX
Virtual DOM
6. JSX
JSX - javascript XML syntax transform.
It helps in making our writing code easier and faster. JSX
lets us writeHTML (not 100%) with XML based object
representation.
7. Line 8-19 : Telling browser the code between the script block is JSX and not normal
JavaScript.
Line no 12 : This is how we write the HTML in JSX
8. If you don’t want to use JSX, you can still work in react however the code would be like
the above as compare to the last slide without JSX
9. Components
In Reactjs the whole application is break into the
components. Components are interactive, reusable and
stageful too.
10. Line 9 : We are creating our component with name MyApp
Line 18 : We are calling/rendering our component in the content div on the HTML
page
11. Unidirectional Data Flow
- As compare to other MVC frameworks/Library Reactjs use the concept of
unidirectional data flow.
- In Reactjs application the data flow from the parent to the children
component by the state and the props.
- Only one parent is responsible to update the states and passing the value to
the children components via props.
- setState is used to update/refresh the UI when the state change and the
value can be pass to the children component by the this.props
12. Virtual DOM
• Reactjs uses the concept of the virtual DOM.
• It selectively render the subtree of DOM elements into the
rendering of the DOM on state change
• Use different algorithm with the browser DOM tree to identify
the changes
• Instead of creating new object, Reactjs just identify what change
is took place and once identify update that state.
• This way it is creating a virtual DOM and improving the
performance too
• Can be render on server and sync on Local
15. Components
• Everything in reactjs is components. The core building
blocks of React application is components only.
Components interact with each other and maintain the
state too. In Reactjs whole application is need to be break
into the component only.
17. props
• In Reactjs props are like the HTML Properties. They are used to
pass the data between the components or via the states. In
Reactjs the props can be accessed by this.props.propsname
• Props can be define by name=“value”. To access this we have
to call this.props.name
18. React.render(<MyComponent name=“Neha” />) : name is the one of the props of
the component MyComponent . To access the value of the props in the react we
use {this.props.name}.
19. states
Every component has a State object. Can be set by using setState.
setState triggers UI updates and to get the initial state before the
setState : getInitialState.getDefaultProps
20. Reactjs maintained the state – getIntialState, setState, getDefaultProps.
In the above example we are getting the count variable to 5 and accessing it by
{this.state.count}
21. Component Lifecycle
• componentWillMount – Client and server side
componenet Will Occur only once (before)
• componentDidMount – Only once (after)
• shouldComponentUpdate – Return value
determines weather component should update
• componentWillUnmount – Before unmounting
component
22. Events
• Reactjs has the events that are attached with
the components as the props of the
components and can trigger methods.
23. We have created a custom method clickCount and onClick of the button we are
calling it onClick = {this.clickCount}
24. Unidriectional Data Flow
• In reactjs, application data flows unidirectional via the state
and props not like angular js where we have 2-way data
binding. Which means in multiple component hierarchy , a
common parent component should manage the state and pass
it down the chain by props.
• setState - state should be updated by setState to ensure UI
will refresh/update
• this.props – to pass the value to the child components
25. Angular Backbone React
Type MV* MVC V
Technology HTML/CSS/JS/Ang
ular
HTML/CSS/JS/bac
kbone
JSX
Core MVC MVC Components
View HTML HTML Virtual DOM
Data Flowing 2 way binding - Unidirectional
Creator Google - FB* & Instagram
Architchure - - React Native &
Flux
SEO Support Phantom js - SEO friendly