How to update the list of autocompletions shown in chrome?

Question

JavaScript

Problem like this:
Yes

<form autocomplete="on"><br>
<input name="user" id="myInput" list="myDataList" autocomplete="on"><br>
<datalist id="myDataList"><option value="val1"></option></datalist><br>
</form>

The user entered let's say "va", he is shown the autocomplete "val1".
Additional auto-completions can be defined on the server. Javascript ajaxed to the server for additional autocomplete options for "va" and added the appropriate ones <option>to <datalist>.
But until the user enters / erases another letter, additional auto-completion options do not appear in the auto-completion field.
Question: how to update the displayed list of autocompletions without user action?

Example (abstract).
Opera is similar to Chrome.
In Firefox - thanks to the focus hack - everything works.

Answer 1

Why not just use bootstrap-typeahead.js?

Answer 2

missed