function runAfterElementExists(jquery_selector, callback) {var checker = window.setInterval(function() {if ($(jquery_selector).length) {clearInterval(checker);callback();}}, 200);} var ArtNr = '3R-JK0P-6PC9'; $('input[name="variationid"]').val('3R-JK0P-6PC9'); $(".ItemQuestionForm form > input[data-mail='subject']").val("Artikel-Nummer: " + ArtNr); $('.ItemQuestionForm input[name="Artikelnr."]').attr('disabled', 'disabled').val(ArtNr);