dropdown.setValue()

When the dropdown component is not in a listView, I can use dropdown.setValue(null) to set the value of the dropdown to null

When the dropdown component is in a listView, and when I use dropdown.setValue(null), it returns "dropdown.setValue is not a function".

Is there a workaround on this, please?

In a ListView the component is actually an array of components. So you would do:

dropdown[i].setValue(null)

With i being the index of the listview "row" you are changing.