Load dropdown item but disable for selection - dom

Question

So I want to be able to load the 'Choose' dropdown option, but disable it as soon as a change is made on the drop-down.
I've attempted adding a disabled attribute tag on the selection, but it loads on 'Alabama' and I don't want that.
How would I be able to tackle this?
<div class="row mt-3">
<div class="col-md">
<label for="resident">I am a resident of:</label>
</div>
</div>

Answer 1

Adding hidden and selected to the first option should do the trick.
<div class="row mt-3">
<div class="col-md">
<label for="resident">I am a resident of:</label>
<select class="custom-select" id="resident" required>
<option hidden selected value="">Choose...</option>
<option>Alabama</option>
<option>Alaska</option>
<option>Colorado</option>
<option>New York</option>
<option>South Dakota</option>
</select>
<div class="invalid-feedback">
Select state of residence.
</div>
</div>
</div>
If you want to still see the "Choose..." after the user has made a selection, replace hidden with disabled.

Answer 2

Why don't you disable the first option? (no javascript is needed and the result is like what you want to achieve I think):
<div class="row mt-3">
<div class="col-md">
<label for="resident">I am a resident of:</label>
<select class="custom-select" id="resident" required>
<option value="" disabled>Choose...</option>
<?php foreach (Vars::states() as $abbr => $state): ?>
<option value="<?= $abbr; ?>"><?= $state; ?></option>
<?php endforeach; ?>
</select>
<div class="invalid-feedback">
Select state of residence.
</div>
</div>
</div>
And a demo code snippet of what it looks like:
<select required>
<option value="" disabled selected>Select your option</option>
<option value="1">Alabama</option>
<option value="2">Alaska</option>
<option value="3">...</option>
</select>