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10_refs.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Props Validation</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/prop-types/prop-types.js"></script>
<script src="https://unpkg.com/react-dom@latest/dist/react-dom.js"></script>
<script src="https://unpkg.com/[email protected]/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel" src="js/readMore.js"></script>
<script type="text/babel" data-presets="es2015,stage-2,react" data-plugins="transform-class-properties">
( function() {
/**
* OtherComponent
*
* a simple component to show how refs return a component in react
*/
class OtherComponent extends React.Component
{
render() {
return <input type="text" placeholder={ this.props.placeholderText } />
}
}
/**
* ShowRefsComponent
*
* main component to show how refs work in react
*/
class ShowRefsComponent extends React.Component
{
state = {
value : 'textfield value'
}
componentDidMount()
{
console.log( this.inputNode ); // --> the wrapper node
console.log( this.otherComponent ); // --> the React Element of other
this.inputNode.focus();
}
componentDidUpdate( prevProps, prevState)
{
console.log('prevState.value: ', prevState.value, '\nthis.state.value: ', this.state.value)
}
handleChange = () =>
{
this.setState( {
value : this.inputNode.value,
} );
}
render()
{
return(
<div className="input-refs">
<OtherComponent
ref={ other => this.otherComponent = other }
placeholderText="other component"
/>
<br/>
<input
type="text"
ref={ input => this.inputNode = input }
placeholder="input component"
value={ this.state.value }
onChange={ this.handleChange }
/>
<ReadMore url="https://facebook.github.io/react/docs/refs-and-the-dom.html" />
</div>
);
}
}
// render to Component:
ReactDOM.render(
<ShowRefsComponent />,
document.querySelector( '#root' )
);
}() )
</script>
</body>
</html>