JQuery like event delegation for vanilla JS.

addDynamicEventListener.js

  /**
   * helper function for event delegation
   * 
   * @param {string} event - event name
   * @param {string} selector - selector for element
   * @param {(Event) => void} callback - callback to invoke with click event
   */
  const addDynamicEventListener = (event, selector, handler) => {
    const _handler = function (e) {
      let target = e.target;

      while (target && target !== this) {        
        if (target.matches(selector)) {
          handler.call(target, e);
          break;
        }

        target = target.parentElement;
      }
    };

    document.body.addEventListener(event, _handler);
  };