Created
February 7, 2018 20:16
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A TODO App in react
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class TodoApp extends React.Component { | |
constructor(props) { | |
super(props); | |
this.state = { items: [], text: '' }; | |
this.handleChange = this.handleChange.bind(this); | |
this.handleSubmit = this.handleSubmit.bind(this); | |
} | |
render() { | |
return ( | |
<div> | |
<h3>TODO</h3> | |
<TodoList items={this.state.items} /> | |
<form onSubmit={this.handleSubmit}> | |
<input | |
onChange={this.handleChange} | |
value={this.state.text} | |
/> | |
<button> | |
Add #{this.state.items.length + 1} | |
</button> | |
</form> | |
</div> | |
); | |
} | |
handleChange(e) { | |
this.setState({ text: e.target.value }); | |
} | |
handleSubmit(e) { | |
e.preventDefault(); | |
if (!this.state.text.length) { | |
return; | |
} | |
const newItem = { | |
text: this.state.text, | |
id: Date.now() | |
}; | |
this.setState(prevState => ({ | |
items: prevState.items.concat(newItem), | |
text: '' | |
})); | |
} | |
} | |
class TodoList extends React.Component { | |
render() { | |
return ( | |
<ul> | |
{this.props.items.map(item => ( | |
<li key={item.id}>{item.text}</li> | |
))} | |
</ul> | |
); | |
} | |
} | |
ReactDOM.render(<TodoApp />, mountNode); |
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