How to trigger alert automatically in drop down list?

Question

  <select name="cars" id="cars">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
  </select>

For example, if I selected Volvo, then it will alert ("Volvo"), when i select Saab, it will alert("Saab")

Answer 1

Select any option frome this and it will alert

<select name="cars" id="cars" oninput="alert(this.value)">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
  </select>