How to get each user's keystroke when he pressed a certain key?

I need to get each user's keystroke when he pressed a certain key("#") and stop getting his keystroke when he pressed other key(space(" ")). For example: a user enters the text "I wanna go to #shop", I need to save his input and the tag inside it. How can I do it? I wrote some code to do it but I don't know how to make it completely

onKeyDown = (e) => {
  let value = e.target.value, tags = [], currentTag = "";

  if (e.key == "Enter") {
    this.setState((state) => {
      const item = this.createNote(value, tags);
      return { notes: [...state.notes, item] };
    });
  }

  if (e.key == "#") {}
};

Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW

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