Conditionally disabled React Checkboxes

Question

I am building out a listing of checkboxes and only want the user to be able to select 2 checkboxes and then it will disable the checkboxes. I have a disabled prop which I ca

Answer 1

You could keep an object in state that keep track of the checkbox values, and in your render method you can check if there are 2 or more checkboxes that are checked and use this to disable the others.

Example

class App extends React.Component {
  state = { checked: {} };

  onSelectedChange = index => {
    this.setState(previousState => ({
      checked: {
        ...previousState.checked,
        [index]: !previousState.checked[index]
      }
    }));
  };

  render() {
    const { checked } = this.state;
    const checkedCount = Object.keys(checked).filter(key => checked[key]).length;
    const disabled = checkedCount > 1;

    return (
      

        {Array.from({ length: 5 }, (_element, index) => (
           this.onSelectedChange(index)}
            type="checkbox"
            checked={checked[index] || false}
            disabled={!checked[index] && disabled}
          />
        ))}
      
    );
  }
}

ReactDOM.render(, document.getElementById("root"));