Very simple and straight forward. I pre-populated a HTML datalist with values, on the form when I want select a value and insert it into SQLite database. This is my example
The easy way is to get the name of datalist using it's name attribute and then use val() function to see the value selected
val()
$('[name="TypeList"]').val();
Check the working example https://jsfiddle.net/ch9uwvod/8/