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07_state-props.html
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07_state-props.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() {
/**
* 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 = {
ui : 'default',
title : this.props.title,
content : this.props.content,
};
/**
* // Don't do:
*
* this.state = this.props
* this.state.ui = 'default';
*
* // because it will make the props mutable
*
* const a = { test : '1' }
* const b = a;
*
* // a === b --> true
*
* const c = { test : a.test }
* // const c = Object.assign( {}, a ) works the same way
*
* // a === b --> false
*/
}
render()
{
return (
<div className="my-component">
<h1 onClick={ this.handleHeaderClick }>{ this.state.title }</h1>
<p
onClick={ this.handleContentClick }
className={ `is-${this.state.ui}` }
>
{ this.state.content }
</p>
</div>
);
}
/**
* handleHeaderClick
*
* naming convention in react: handle<Event> for event handlers
*
* = () => binds the context to the MyComponent context
*/
handleHeaderClick = () =>
{
// setState( Object );
this.setState( {
title : 'changed title',
} );
}
/**
* handleContentClick
*/
handleContentClick = () =>
{
// setState( callbackFunc )
this.setState( prevState =>
{
return {
content : 'Lorem ipsum dolor sit amet, consetetur sadipscing elitr.',
ui : 'changed',
};
} );
}
}
// render to Component:
ReactDOM.render(
<MyComponent
title="My Title"
content="Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua."
/>,
document.querySelector( '#root' )
);
}() )
</script>
</body>
</html>