I Want To Submit The Form When Last Option Of Dropdown Is Selected Options Are Generated Dynamically

For example I am adding field after selecting the Parent then insert child field , I want to submit a form when select list is ended or select is on last child how to submit after

Solution 1:

var strLastOptionSelected = $("select option:last-child").val();

$("select").change(function() {
  if ($(this).children("option:selected").val() === strLastOptionSelected) {
    alert("You have selected the last option");
    //Submit code
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select>
  <option value="1">Option 1</option>
  <option value="2">Option 2</option>
  <option value="3">Option 3</option>
  <option value="4">Option 4</option>
</select>