element-closest/index.mjs

Return the closest element matching a selector up the DOM tree

function polyfill(window) {
  var ElementPrototype = window.Element.prototype;

  if (typeof ElementPrototype.matches !== 'function') {
    ElementPrototype.matches = ElementPrototype.msMatchesSelector || ElementPrototype.mozMatchesSelector || ElementPrototype.webkitMatchesSelector || function matches(selector) {
      var element = this;
      var elements = (element.document || element.ownerDocument).querySelectorAll(selector);
      var index = 0;

      while (elements[index] && elements[index] !== element) {
        ++index;
      }

      return Boolean(elements[index]);
    };
  }

  if (typeof ElementPrototype.closest !== 'function') {
    ElementPrototype.closest = function closest(selector) {
      var element = this;

      while (element && element.nodeType === 1) {
        if (element.matches(selector)) {
          return element;
        }

        element = element.parentNode;
      }

      return null;
    };
  }
}

export default polyfill;
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