How do I search a name from an autofill dropdown but pass the id instead

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Javascript

Ruby

bootstrap

Suppose i have a prefilled field which actuallt fetches the id from database but shows the name instead. I want to make that field editable. And hence a person should be able to edit it from the advanced search of name in dropdown but should submit the id at the end instead. How do i solve it in bootstrap using javascript?

What I have tried:

Tried fetching the id using javascript and name too. using an id i show the name but store the id. but dont know how to allow input for the same field