A simple implementation of detecting a click outside of an element encapsulated in a custom hook useClickOutside. It uses react hooks useRef and useEffect and bs-webapi that provides bindings to the DOM API.

The hook returns a ref that needs to be attached to an element, and takes in a function of type Dom.mouseEvent => unit that will be called if a click is detected outside of that element.

Basic usage:

open ClickOutside;

[@react.component]
let make = () => {
  let handleClickOutside = _ => {
    Js.log("Click outside detected");
  };
  let divRef = useClickOutside(handleClickOutside);

  <div ref={ReactDOMRe.Ref.domRef(divRef)} />;
};

The repo contains a simple dropdown component to show the usage of the hook. Styling of the dropdown is implemented with the amazing bs-css.

npm install
npm start
# in another tab
npm run webpack

After you see the webpack compilation succeed (the npm run webpack step), open up build/index.html (no server needed!). Then modify whichever .re file in src and refresh the page to see the changes.

To run with the webpack development server run npm run server and view in the browser at https://localhost:8000. Running in this environment provides hot reloading and support for routing; just edit and save the file and the browser will automatically refresh.