React-js

Aug 27, 20150 likes1,574 views

This document discusses React, including its web evolution, concepts, syntax, and an example. It begins with an introduction to React and links to code. It then covers React's role in the evolution of the web and data presentation, comparing it to traditional MVC frameworks. Key React concepts are outlined, such as viewing it as a view engine rather than framework, its use of components and single direction data flow, and virtual DOM. React syntax is also summarized, including state, JSX, props, events, mixins, and refs. The document concludes with building a Facebook wall example in React.

Avi Kedar 
Open Source Department
Manager, codeoasis.com
React-js

get the code...https://github.com/avi1234/reactjs-presentation

React
Web Evolution
Concept
Syntax
Example

ReactWeb Evolution
DataPresentationLogic

ReactWeb Evolution
DataPresentationLogic
M V C

ReactWeb Evolution
VC
Generation2
MM
M
M
MM
M
M

ReactWeb Evolution
VC
Generation2
M
M
DOM
Controllers
Services
Routes
Resources
Directives

ReactWeb EvolutionGeneration2
1. Scale is a Pain

ReactWeb EvolutionGeneration2
2. Performance
VC
DOM
Controllers
Services
Routes
Resources
Directives

ReactWeb Evolution
VC
Generation2
I/O
2. Performance

ReactConcept
View Engine - Not a Framework
Carpaccio Reach Components
Single Way Data Flow
Virtual DOM

ReactConcept
View Engine - Not a Framework
• Just the V from MVC
• No routing
• No dependency injection
• No major logic components (controllers)

ReactConcept
Carpaccio Reach Components
• The entire page is split into a tree of
V items
• Each V item contains:
• State
• Render Method
V
Show Feeds
List
V
Show Feed
V
Show
Comments
V
Show
Comment
V
Add
Comment
V
Show Ad

ReactConcept
Single Way Data Flow
• Forget about 2 way data binding
• The results of V are immutable
• Reconcile process - through away the previous layout and
recreate it on every change
onChange

ReactConcept
Virtual DOM
• The DOM is presented as javascript object
• Each reconcile process creates a new revision of the virtual DOM
• React will compare the two revisions and create list of execution
actions that will be executed on the actual DOM
onChange
old
new
compare
execute

ReactConcept
Virtual DOM
VC Minimum I/O
javascript
browser
DOM

ReactSyntax
State
JSX
Props
Events
Mixings
Refs

ReactSyntax
State
JSX
Props
Events
Mixings
Refs
componentWillMount
render
componentDidMount
componentWillUnmount
Before adding to the DOM
for the ﬁrst time
After each change 
After render the component
for the ﬁrst time
Before removing the
component from the DOM

React
Facebook Wall
Example
Lets Build...
https://github.com/avi1234/reactjs-presentation

Tutorial Videos: https://www.youtube.com/playlist?list=PLD8nQCAhR3tQ7KXnvIk_v_SLK-Fb2y_k_ Day 1 : Introduction to React, Babel and Webpack Prerequisites of starting the workshop ( Basic understanding of Node & Express ) What is Virtual DOM? What is React and why should we use it? Install and set up React: a-Using create-react-app b-From scratch using Babel and Webpack. We will use Webpack Dev Server. Day 2 : React Basic Concepts Types of Components: Class-based and Functional based Components Use of JSX Parent, Child, and Nested Components Difference between State and Props Create and Handle Routes Component Lifecycle Methods Create a form and handling form inputs Use of arrow functions and Spread Operator Day 3: Advanced Concepts in React Use of Refs What are Higher Order Components( HOC )? How to use HOC Understanding Context in React

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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. ---------------------------------------------------------- Get Socialistic Our website: http://valuebound.com/ LinkedIn: http://bit.ly/2eKgdux Facebook: https://www.facebook.com/valuebound/ Twitter: http://bit.ly/2gFPTi8

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React-js

1. Avi Kedar  Open Source Department Manager, codeoasis.com React-js

2. get the code...https://github.com/avi1234/reactjs-presentation

3. React Web Evolution Concept Syntax Example

4. ReactWeb Evolution DataPresentationLogic

5. ReactWeb Evolution DataPresentationLogic M V C

6. ReactWeb Evolution M V C GenerationXXX

7. ReactWeb Evolution M V C Generation1

8. ReactWeb Evolution VC Generation2 MM M M MM M M

9. ReactWeb Evolution VC Generation2 M M DOM Controllers Services Routes Resources Directives

10. ReactWeb EvolutionGeneration2 1. Scale is a Pain

11. ReactWeb EvolutionGeneration2 1. Scale is a Pain

12. ReactWeb EvolutionGeneration2 2. Performance VC DOM Controllers Services Routes Resources Directives

13. ReactWeb Evolution VC Generation2 I/O 2. Performance

14. React Web Evolution Concept Syntax Example

15. ReactConcept View Engine - Not a Framework Carpaccio Reach Components Single Way Data Flow Virtual DOM

16. ReactConcept View Engine - Not a Framework • Just the V from MVC • No routing • No dependency injection • No major logic components (controllers)

17. ReactConcept Carpaccio Reach Components • The entire page is split into a tree of V items • Each V item contains: • State • Render Method V Show Feeds List V Show Feed V Show Comments V Show Comment V Add Comment V Show Ad

18. ReactConcept Single Way Data Flow • Forget about 2 way data binding • The results of V are immutable • Reconcile process - through away the previous layout and recreate it on every change onChange

19. ReactConcept Virtual DOM • The DOM is presented as javascript object • Each reconcile process creates a new revision of the virtual DOM • React will compare the two revisions and create list of execution actions that will be executed on the actual DOM onChange old new compare execute

20. ReactConcept Virtual DOM VC Minimum I/O javascript browser DOM

21. React Web Evolution Concept Syntax Example

22. ReactSyntax State JSX Props Events Mixings Refs

23. ReactSyntax State JSX Props Events Mixings Refs

24. ReactSyntax State JSX Props Events Mixings Refs

25. ReactSyntax State JSX Props Events Mixings Refs componentWillMount render componentDidMount componentWillUnmount Before adding to the DOM for the ﬁrst time After each change  After render the component for the ﬁrst time Before removing the component from the DOM

26. ReactSyntax State JSX Props Events Mixings Refs

27. ReactSyntax State JSX Props Events Mixings Refs

28. ReactSyntax State JSX Props Events Mixings Refs

29. React Web Evolution Concept Syntax Example

30. React Facebook Wall Example Lets Build... https://github.com/avi1234/reactjs-presentation

31. React Thank You