function runAfterElementExists(jquery_selector, callback) {var checker = window.setInterval(function() {if ($(jquery_selector).length) {clearInterval(checker);callback();}}, 200);} var ArtNr = 'O-222wanu'; $('input[name="variationid"]').val('O-222wanu'); $(".ItemQuestionForm form > input[data-mail='subject']").val("Artikel-Nummer: " + ArtNr); $('.ItemQuestionForm input[name="Artikelnr."]').attr('disabled', 'disabled').val(ArtNr);