How can i update select option from state in react.js

Question

I created an input, when you write something and click on the button, value adds to our state, now I am trying to update select option from state like this:

const NewGroup = () => {
  const [group, setGroup] = useState([]);
  const addToGroup = (e) => {
    const newGroup = group;
    newGroup.push(e.target.previousElementSibling.value);
    setGroup(newGroup);
  };
  return (
    <div>
      <input type="text" name="" id="" />
      <button onClick={addToGroup}>submit</button>
      <div>
        <select name="" id="">
          {group.map((category) => {
            return <option value=''>{category}</option>;
          })}
        </select>
      </div>
    </div>
  );
};
export default NewGroup;

But nothing did happened.

Answer 1

You can introduce another useState() for writing into <input> element. And when the Submit button is pressed, you only push the someText to the group array.

const NewGroup = () => {
  const [group, setGroup] = useState([]);
  const [someText, setSomeText] = useState("");
  const addToGroup = (e) => {
    // Takes up all the present elements(of array group) and adds new element (search)
    let temp = [...group, someText];
    setGroup(temp);
  };
  return (
    <div>
      <input type="text" name="" id="" value={someText} onChange={(e) => { setSomeText(e.target.value); }} />
      <button onClick={addToGroup}>submit</button>
      <div>
        <select name="" id="">
          {group.map((category, index) => {
            return (
              <option key={index} value="">
                {category}
              </option>
            );
          })}
        </select>
      </div>
    </div>
  );
}

export default NewGroup;

Here's the link to the working app https://codesandbox.io/s/boring-ptolemy-0cwzmi?file=/src/App.js