React 101 by Anatoliy Sieryi

REACT 101
Anatoliy Sieryi
Submit PHP 2016

Anatoliy Sieryi
JS Developer
Binary Studio Academy
JS group coach
“Sir are you classified as human?”
“Negative, I am a meat popsicle”

React
A JAVASCRIPT LIBRARY FOR BUILDING USER INTERFACES
Declarative
React makes it painless to create
interactive UIs. Design simple views
for each state in your application,
and React will efficiently update and
render just the right components
when your data changes.
Declarative views make your code
more predictable and easier to
debug.
Component-Based
Build encapsulated components that
manage their own state, then
compose them to make complex
UIs.
Since component logic is written in
JavaScript instead of templates, you
can easily pass rich data through
your app and keep state out of the
DOM.
Learn Once, Write
Anywhere
We don't make assumptions about the rest
of your technology stack, so you can
develop new features in React without
rewriting existing code.
React can also render on the server using
Node and power mobile apps using React
Native.

React
◉ Vanilla JS
◉ Vanilla JS
◉ Vanilla JS
◉ Vanilla JS. Kinda
◉ Vanilla JS
documentation
Angular 2
◉ Typescript
◉ Batteries Included
◉ DSL
◉ HTML Templates
◉ Typescript
documentation

Hello World Component
// React.createElement(component, [props], [...children])
function Hello(props) {
return React.createElement('div', null, `Hello, ${props.name}`);
}
React.createElement(Hello, { name: "World" });

Enter The JSX
function Hello(props) {
return <div>{`Hello, ${props.name}`}</div>;
}
<Hello name="World" />
// <div>Hello, World</div>

JSX example
const element = (
<div>
<h1>Hello!</h1>
<h2>Good to see you here.</h2>
<i className="fa fa-first-order" />
<MyComponent />
</div>
);

Object - Oriented Style
class Hello extends React.Component {
render() {
return <div>{`Hello, ${this.props.name}`}</div>;
}
}

Without ES2015
var Hello = React.createClass({
render: function() {
return <h1>Hello, {this.props.name}</h1>;
}
});

Hello World App / index.html
<html>
<head>
<title>React is Awesome</title>
</head>
<body>
<div id="root"></div>
<script src="app.js"></script>
</body>
</html>

Hello World App / app.js
import React from 'react';
import ReactDOM from 'react-dom';
import Hello from './components/Hello';
ReactDOM.render(
<Hello name="World" />,
document.getElementById('root')
);

import ListItem from './ListItem';
export class List extends React.Component {
render() {
return (
<div className="list">
{
this.props.list.map(item =>
<ListItem key={list.id} data="list" />)
}
</div>
);
}
}

const warningStyle = {
color: '#ff0000',
fontSize: 'large',
'font-weight': 'bold'
}
export class Warning extends React.Component {
render() {
return (
<div style={warningStyle}>NOOOOOOOO!</div>
);
}
}

export class SomePage extends React.Component {
render() {
return (
{
this.props.isLoggedIn ?
<Welcome />
:
<Forbidden />
}
);
}
}

export class MyButton extends React.Component {
handleClick(e) {
alert(e.target.value);
}
render() {
return (
<input
className="my-button"
type="button"
value="Click me!"
onClick={this.handleClick}
/>
);
}
}

Synthetic Events
boolean bubbles
boolean cancelable
DOMEventTarget currentTarget
boolean defaultPrevented
number eventPhase
boolean isTrusted
DOMEvent nativeEvent
void preventDefault()
boolean isDefaultPrevented()
void stopPropagation()
boolean isPropagationStopped()
DOMEventTarget target
number timeStamp
string type

State
constructor(props) {
super(props);
this.state = {
activeTab: this.props.tabs[0].id,
foo: 'bar'
};
}
onSwitch(id) {
this.setState({ activeTab: id });
}
render() {
const tab = this.props.tabs.find(tab =>
tab.id === this.state.activeTab);
return (
<div className="tabs">
<TabControls
tabs={this.props.tabs}
onSwitch={this.onSwitch.bind(this)}
/>
<TabContent data={tab} />
</div>
);
}

Refs
<input
type="text"
ref={inputNode => this.textInput = inputNode}
/>
scrollToInput() {
this.textInput.scrollIntoView();
}
<input
type="text"
ref="textInput"
/>
focusOnInput() {
this.refs.textInput.focus();
}

componentDidMount() {
fetch('data.json').then(res => {
this.setState({
data: res.data
});
});
};
componentWillMount() {
this.interval = setInterval(() => {
console.log('tick')
}, 1000);
}
componentWillUnmount() {
clearInterval(this.interval);
}

React-Router
import { Router, Route, browserHistory } from 'react-router';
// browserHistory / hashHistory / createMemoryHistory
ReactDOM.render((
<Router history={browserHistory}>
<Route path="/" component={App}>
<Route path="about" component={About}/>
<Route path="users" component={Users}>
<Route path="/user/:userId" component={User}/>
</Route>
<Route path="*" component={NoMatch}/>
</Route>
</Router>
), document.getElementById('root'));

Basic Configuration
import { createStore, combineReducers } from 'redux';
import { Provider } from 'react-redux';
const rootReducer = combineReducers({ myReducer, myReducer2 });
const store = createStore(rootReducer);
ReactDOM.render(
<Provider store={store}>
<MyRootComponent />
</Provider>,
document.getElementById('root')
);

Actions
export const DO_A_BARREL_ROLL = 'DO_A_BARREL_ROLL';
export const CHANGE_USER_NAME = 'CHANGE_USER_NAME';
export function doABarrelRoll() {
return {
type: DO_A_BARREL_ROLL
};
}
export function changeUserName(newName) {
return {
type: CHANGE_USER_NAME,
payload: {
newName
}
};
}

Async Actions (redux-thunk)
export function getCustomers(params) {
return (dispatch, getStore) => {
const store = getStore();
api.getCustomers(params).then(res => {
dispatch(populateCustomers(res.data));
});
};
}
export function populateCustomers(customers) {
return {
type: POPULATE_CUSTOMERS,
payload: {
customers
}
};
}

Reducer
import { DO_A_BARREL_ROLL } from './MyPageActions';
const initialState = {
barrelRollsDone: 0
};
export default function myPage(state = initialState, action) {
switch (action.type) {
case DO_A_BARREL_ROLL:
return Object.assign({}, state, {
barrelRollsDone: state.barrelRollsDone + 1
});
default:
return state;
}
}

Container (Smart Component)
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
function mapStateToProps(state) {
return {
myPage: state.myPage
};
}
function mapDispatchToProps(dispatch) {
return {
actions: bindActionCreators(Object.assign({}, myPageActions), dispatch)
};
}
export MyComponent;
export default connect(mapStateToProps, mapDispatchToProps)(MyComponent);

Links
React
Redux
The Evolution of Flux Frameworks
Webpack
React boilerplates
How it feels to learn JavaScript in 2016

React 101 by Anatoliy Sieryi

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