jquery get selected option value on change code example

Example 1: .on change get value

$('select').on('change', function() {
  alert( this.value );
});

Example 2: get selected option value

var conceptName = $('#aioConceptName').find(":selected").val();

Example 3: jquery dropdown selected value show field

jQuery(document).ready(function() {
    jQuery("#carm3").change(function() {
        if (jQuery(this).val() === 'other'){ 
            jQuery('input[name=other_interest]').show();   
        } else {
            jQuery('input[name=other_interest]').hide(); 
        }
    });
});