The code below always shows opt 5 instead of the one I clicked.

In HTML :

 <div id = "dropdown_1" class="dropdown">
    <button onclick="dropdown_toggle()" class="dropbtn">Dropdown</button>
    <div id="myDropdown" class="dropdown-content">
    </div>
 </div>

In another js file :

   var select = document.getElementById("myDropdown");
   var options = ["opt 1", "opt 2", "opt 3", "opt 4", "opt 5"];


  for(var i = 0; i < options.length; i++) {
      var opt = options[i];
      var el = document.createElement("a");
      el.textContent = opt;
      el.value = opt;
      el.onclick = function(event) {
        
        console.log(opt);
        
      }
      select.appendChild(el);
  }