load data to select from XML file by JavaScript

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Javascript

XML

selection

I want to load the select (drop down list) with data from xml file.
this code is to load xml file:

x = xmlDoc.getElementsByTagName("User");

"User" is the tag i want to catch if i found it, then update inter subTages like:
"UserName","Password","Type".
After catch "User" update depending on select.selected.
Update "Password" will be from Textbox.
Update "Type" will be from select.
This is the code i write but it doesn't get my output, any one could help by new code or edit my code.

var select = document.getElementById("updater");
          
          for (i = 0; i < x.length; i++) {
              select.options[select.options.length] = new Option(x[i].getElementsByTagName("UserName")[0].childNodes[0].nodeValue, x[i].getElementsByTagName("UserName")[0].childNodes[0].nodeValue);
              
          }
          
          select. önchange = function update() {
              for (i = 0; i < x.length; i++) {
                  if (document.getElementById("updater").value = x[i].getElementsByTagName("UserName")[0].childNodes[0].nodeValue) {
                      document.getElementById("password").value = document.getElementsByTagName("Password")[0].childNodes[0].nodeValue;
                      document.getElementById("Typ").value = document.getElementsByTagName("Typ")[0].childNodes[0].nodeValue;
                  }
              }
          }

Thanks