Changing boolean attribute within a React state object

Question

I'm trying to update a boolean attribute inside a state object, and I'm having some trouble. Here is what I'm attempting to do:

this.setState(
  prevState => ({
    selectedGrocery: {
      ...prevState.selectedGrocery,
      checked: !prevState.checked
    }
  }),
  () => {
    console.log(this.state.selectedGrocery);
  }
);

State selectedGrocery.checked is initialized as false, and when I call the above code, it changes to true, but the next time the code is called, it doesn't change back to false. Thanks in advance!

Did my answer work for you? Consider accepting it if that's the case. — Tholle
– Tholle, Commented Nov 26, 2018 at 23:10

Tholle · Accepted Answer · 2018-11-25 00:03:50Z

2

You need to use prevState.selectedGrocery.checked in order to use the correct property.

this.setState(
  prevState => ({
    selectedGrocery: {
      ...prevState.selectedGrocery,
      checked: !prevState.selectedGrocery.checked
    }
  }),
  () => {
    console.log(this.state.selectedGrocery);
  }
);

answered Nov 25, 2018 at 0:03

Tholle

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