Fill in form with customer ID

Question

I have a form with customer ID, customer name, address and email. As the ID is only wanted that when the input of the ID is filled in, do a search in the database and complete the rest of the form with the missing input’s. The problem is that I do not want with any button, I wanted even after filling "he" is searched immediately without updating the page or anything like that.

Answer 1

inp.addEventListener("id", function () { 
   //chamada da função que vai preencher os campos
}, false);