JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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There is no easiest method then to use Auto Complete Widget. The auto-complete field provides suggestions while you type into the field. This will ease the process of filling out a form. If you have a dropdown list of more than 100 entries, the dropdown becomes unusuable for the users. So, it is recommended to use an autocomplete field in such case.
Hope this will help. Let us know if you need further assistance.