Go to next fields Javascript on Mobile fail

Hello!

I have used a document javascript to make an auto go to next field and it works perfectly right on desktop but does not do anything on Mobile using Reader (Android or iOS). Does something like that is completely impossible on Mobile?

I have this in my doc script:

function tab_next(next_field_name) {
    if (event.willCommit || AFMergeChange(event).length === event.target.charLimit) {
        getField(next_field_name).setFocus();
    }
}

and use this for keystroke script:

tab_next("name of next field");

Please tell me it’s possible to accomplish something similar on Mobile and how. Thanks!