This plugin generates autocomplete box for select box. For example, it is useful for assisting input of a select box containing many option elements.

$ cd $(REDMINE_HOME)/plugin
$ git clone https://github.com/heriet/redmine-selectbox-autocompleter.git selectbox_autocompleter

and restart your redmine.

You can configure target (html id attiribute) for convert selectbox to autocomplete box.

Default target list are below.

issue_assigned_to_id
values_assigned_to_id_1
values_author_id_1
wiki_page_parent_id
project_quick_jump_box

Convert select box using Select2.

Insert input box with datalist.

Insert input box with jQuery.
This is useful for IE and Edge because jQuery list is a partial match; the list by the autocomplete attribute is a forward match in IE and Edge.