JSFiddle - React, Tailwind, and code Playground

by David Thomas

HTML

<select id="fld_1">
    <option value="0">No accounts</option>
    <option value="1">Presumably there's an account</option>
    <option value="2">And maybe another account</option>
</select>
<select id="fld_2" disabled>
    <option>One</option>
    <option>Two</option>
    <option>Three</option>
</select>

JavaScript

$('#fld_1').change(function(){
    $('#fld_2').prop('disabled', $(this).val() == 0);
}).change();