Hire a Javascript Developer

We looking for a php/javascript developer, who support us in a small php/html form project. What we need: We type a search string in an input field, thats trigger a request to a php/json api after click on the send-button. (no page reload) The api/url returns a json response with the result. The result is a html option list, that should fill a another html select element. If the input field not filled, the input select element are empty.