/
08_lifecycle.html
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/
08_lifecycle.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<link href="https://fonts.googleapis.com/css?family=Roboto+Mono:300,300i,700,700i|Roboto:300,300i,700,700i" rel="stylesheet">
<link rel="stylesheet" href="css/react.css">
<script src="https://unpkg.com/react@latest/dist/react.js"></script>
<script src="https://unpkg.com/react-dom@latest/dist/react-dom.js"></script>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel" data-presets="es2015,stage-2,react" data-plugins="transform-class-properties">
( function() {
/**
* List
*
* @param {Object} props props thats are passed through
*
* @returns {Object} React Element containing the list and a title
*/
const List = ( props ) => (
<div>
<h1>{ props.title }</h1>
<ul className="list">
{
props.list.map(
item => <li className="list-item" key={ item.id }>{ item.content }</li>
)
}
</ul>
</div>
);
/**
* MyButton
*
* React function component for stateless components
*
* @param {Object} props props that are passed to the component
*
* @return {Object} React Element Object
*/
class MyComponent extends React.Component
{
constructor( props )
{
// run super to run constructor on React.Component
super( props );
// set initial state
this.state = {};
}
fetchData( url, callback )
{
fetch( url )
.then( response => response.json() )
.then( callback );
}
componentDidMount()
{
console.log('%ccomponentDidMount()', 'color:#A53B49')
this.fetchData( this.props.url, json => this.setState( json ) );
}
shouldComponentUpdate( nextProps, nextState )
{
console.group( '1. shouldComponentUpdate(nextProps, nextState)')
console.log( '%cnextState = ', 'color:#476E94', JSON.stringify( nextState, null, 2 ) )
console.log( '%cthis.state = ', 'color:#2F7E3A', JSON.stringify( this.state, null, 2 ) )
console.log( "%cshould update?", 'color:#C2822D', this.state.title !== nextState.title)
console.groupEnd( '1. shouldComponentUpdate(nextProps, nextState)')
if ( this.state.title !== nextState.title )
{
return true;
}
return false;
}
componentWillUpdate(nextProps, nextState)
{
console.group( '2. componentWillUpdate(nextProps, nextState)')
console.log( '%cthis.state =', 'color:#476E94', JSON.stringify( this.state, null, 2 ) );
console.log( '%cnextState = ','color:#2F7E3A', JSON.stringify( nextState, null, 2 ) );
console.groupEnd( '2. componentWillUpdate(nextProps, nextState)')
}
componentDidUpdate(prevProps, prevState)
{
console.group( '4. componentDidUpdate(prevProps, prevState)')
console.log( '--- props ---' )
console.log( '%cprevProps =', 'color:#476E94', JSON.stringify( prevProps, null, 2 ) );
console.log( '%cthis.props =', 'color:#2F7E3A', JSON.stringify( this.props, null, 2 ) );
console.log( '--- state ---' )
console.log( '%cprevState =', 'color:#476E94', JSON.stringify( prevState, null, 2 ) );
console.log( '%cthis.state =', 'color:#2F7E3A', JSON.stringify( this.state, null, 2 ) );
console.groupEnd( '4. componentDidUpdate(prevProps, prevState)')
}
render()
{
console.log( '%crender()', 'color:#A53B49')
if ( !this.state.hasOwnProperty( 'title' ) )
{
return null;
}
return (
<div>
<List { ...this.state } />
<button onClick={ this.handleClick } className="btn">
load more
</button>
</div>
);
}
/**
* handleClick
*
* callback function for button click event
*/
handleClick = () =>
{
this.fetchData( this.props.urlNext, json => this.setState( json ) );
}
}
// render to Component:
ReactDOM.render(
<MyComponent url="data/state.json" urlNext="data/stateNext.json" />,
document.querySelector( '#root' )
);
}() )
</script>
</body>
</html>