get value from select tag
<form>
Select your favorite fruit:
<select id="mySelect">
<option value="apple">Apple</option>
<option value="orange">Orange</option>
<option value="pineapple">Pineapple</option>
<option value="banana">Banana</option>
</select>
</form>
<script>
function myFunction() {
var x = document.getElementById("mySelect").value;
console.log(x);
}
</script>