React - Select element
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HTML select element in React
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Controlled Component
The react forms components select accept a value attribute that is used to implement a controlled component.
React, instead of using this HTML selected attribute, uses a value attribute on the root select tag.
This is more convenient in a controlled component because you only need to update it in one place.
form implementing a controlled component written as a class component
class SelectForm extends React.Component {
constructor(props) {
super(props);
this.state = {value: 'green'};
this.handleChange = this.handleChange.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleChange(event) {
this.setState({value: event.target.value});
}
handleSubmit(event) {
alert('Your favorite color is: ' + this.state.value);
event.preventDefault();
}
render() {
return (
<form onSubmit={this.handleSubmit}>
<label>
Pick your favorite color:
<select value={this.state.value} onChange={this.handleChange}>
<option value="green">Green</option>
<option value="red">Red</option>
<option value="blue">Blue</option>
<option value="yellow">Yellow</option>
</select>
</label>
<input type="submit" value="Submit" />
</form>
);
}
}
ReactDOM.render(
<SelectForm />,
document.getElementById('root')
);
<div id="root"></div>