jQuery(function ($) { const $input = $('input[name="visitors_textfield5"]'); const $select = $('select[name="visitors5"]'); function syncValue() { const raw = $input.val().trim(); const num = parseInt(raw, 10); const value = (raw === '' || isNaN(num) || num < 0) ? 0 : num; $select.empty().append($('', {value: value, text: value, selected: true})).trigger('change'); if (typeof wpbc_show_cost_hints_after_few_seconds === 'function') { wpbc_show_cost_hints_after_few_seconds(5); } } $input.on('input change', syncValue); syncValue(); });