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component.jsx
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component.jsx
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class TodoList extends React.Component {
constructor(props) {
super(props);
this.state = {
item_input: '',
items: []
};
this.update = this.update.bind(this);
this.add = this.add.bind(this);
this.remove = this.remove.bind(this);
}
update(event) {
this.setState({
item_input: event.target.value
});
}
add() {
this.setState(prev => {
return {
item_input: '',
items: prev.items.concat(prev.item_input)
};
});
}
remove(key) {
this.setState(prev => {
let items = [...prev.items];
items.splice(key, 1);
return {
item_input: '',
items
};
});
}
render() {
return (
<div>
<h4>todo list for {this.props.name} ({this.state.items.length} items)</h4>
<ul>
{
this.state.items.map((item, i) => (
<li key={i}>
{item}
{' '}
<button
type="button"
onClick={() => this.remove(i)}>x</button>
</li>
))
}
</ul>
<input
type="text"
value={this.state.item_input}
onChange={this.update}></input>
<button
type="button"
onClick={this.add}>add item</button>
</div>
)
}
}