autocomplete-element | autocomplete for an ` < input type= '' text '' > ` element | Autocomplete library

According to this example from w3schools the autocomplete works fine.

How do I always make the dropdown autocomplete-elements appear, without typing a character in the inputfield? following the dataset order.

And when typing a characters still filtering the data ()

Like this:

Would be helpful if anybody could tell me how to implement it in the following example

EDIT:

I'm running into one small problem. I want the autocomplete-elements to always display when the focus is active.I activate the focus listener by using. document.getElementById("myInputMobile").focus(); , (See HTML part)

When to focus is set this way, the autocomplete-element are not shown, because the listener is no active.

To show to autocomplete-elements you have to manually press in the input field.

How can I fix this problem?