select option in javascript code example

Example 1: get index of selected option javascript

$("#sel").attr("selectedIndex")
// or
$("#sel")[0].selectedIndex
//or
$(this).prop('selectedIndex')

Example 2: js select option in form

<form name="AddAndEdit">
   <select name="list" id="personlist">
      <option value="P1">Person1</option>
      <option value="P2">Person2</option>
      <option value="P3">Person3</option>
   </select>
</form>