如何使用方法更新 this.state？

Question

I'm trying to set new values to a state, but I can't do this with the methods, the state stills the same.

here a declare my state

 this.state = {
    notes: [],
    selected: null
    };
}

using componentDidMount I can update the state

  componentDidMount() {
this.setState({
  notes: this.service.notes,
  selected: {
       title: "vazio",
       text: "vazio"
     }
    });
  }

but when I use this methods to update, the state stills the same

  onSelect(note) {
   this.setState({
   selected: note
    });
  }

Answer 1

Have you tried?

onSelect = note => {
  this.setState({
  selected: note
 });
}

This gives the onSelect property access to the component scope

Answer 2

Try

onSelect = (note) => () => {
   this.setState({
      selected: note
   })
}

It builds a callback function, providing note as an argument

Use it as follows

onSelect={onSelect(note)}

On whatever handler you are using