The version of Acrobat is not important. What matters is the type of form technology. Do you have a LiveCycle form? or an AcroForm?
The technique described in the blog post for auto select can be done with an AcroForm. But its something you've have to play around with a bit to get right.
I have an AcroForm.
I guess the question is can an Acroform auto-complete combo boxes?
Actually, AcroForm comboboxes already have this feature built in. Just set it to "allow user to enter custom value". If the user exposes the selections and starts typing, the list only shows matches.
Weird. I do have that enabled and auto-complete does not occur. I even have Auto-Complete (Advanced) enabled in the preferences. It works for text boxes but not any other fields.
This is why I was under the impression it might have to be coded.
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Autocomplete is a feature of the viewer, not PDF. So the one I described is a feature of the particular version of Acrobat that I have, Acrobat DC. I don't know what they did in previous versions and it's ridiculous go around testing every version and viewer.
This is a lot of effort for a single feature. Is your form worth it?
I'm curious to know why it would make your life easier for a 50 item list? Please don't consider this question as a challenge to the validity of yours or as anything less than a sincere attempt to understand the problem. I tend to think of form design as an effort to make the user's life easier, in part at least.
In case you're not aware, if the user presses a letter when a combo box has the focus, the first item in the list that begins with that letter will be selected, and subsequent presses of that same letter will select the next item that begins with the letter, if any. This behavior is for the desktop versions (Windows/Mac) versions of Acrobat/Reader at least.