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FIltrowanie produktów jako lista rozwijalna.

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Co robię źle ? Niby wszystko napisałem tak że powinno być ok a po kliknięciu na 2 przycisk z listy wyświetla mi się i tak lista pierwsza. Czy ktoś ma jakiś sprawdzony sposób na filtry rozwijające się ? 

function myFunction() {
window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {
    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {


Zrzut ekranu 2019-12-23 o 13.21.47.png

Edited by grubybarti (see edit history)

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