Applescript / Javascript : select menu I'm filling a webpage using Applescript / Javascript,

one of them is a dropdown menu, which I fill with this code : 

document.querySelector('select#reasonPopUpButton').value = '18';


the issue is the index change time to time.

Can I select the good menu using the title instead of the index?

Here what I tried so far :

tell application "Safari"
    do JavaScript "document.querySelector('select#reasonPopUpButton').value = 'Unauthorized purchase';" in current tab of window 1

end tell
You can filter the list of options for one with the text you're looking for, then select that one. This can be achieved with the following JavaScript:

Array.from(document.querySelector('select#reasonPopUpButton').children)
  .find(el =&gt; el.textContent == "Unauthorized purchase")
  .selected = true;