Show Form Fields Based On Field Value

show_form_fields.js

function toggleFields() {
        $('.additional-field').hide();

        var selected = $('#business-type').val();
        switch (selected) {
            case 1:
                $('#soletrader').show();
                break;
            case 3:
                $('#publicsector').show();
                break;
            case 5:
                $('#charity').show();
                break;
        }
    }
    toggleFields();
    $('#business-type').change(toggleFields);