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nova/resources/js/polyfills/composedPath.js

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+/**
+ * Returns an array with all DOM elements affected by an event.
+ * The function serves as a polyfill for
+ * [`Event.composedPath()`](https://dom.spec.whatwg.org/#dom-event-composedpath).
+ *
+ * @category Event
+ * @param {Event} evt The triggered event.
+ * @return {Array.<HTMLElement>} The DOM elements affected by the event.
+ *
+ * @example
+ * let domChild = document.createElement("div"),
+ *  domParent = document.createElement("div"),
+ *  domGrandparent = document.createElement("div"),
+ *  body = document.body,
+ *  html = document.querySelector("html");
+ *
+ * domParent.appendChild(domChild);
+ * domGrandparent.appendChild(domParent);
+ * body.appendChild(domGrandparent);
+ *
+ * domChild.addEventListener("click", dealWithClick);
+ * const dealWithClick = evt => getEventPath(evt);
+ *
+ * // when domChild is clicked:
+ * // => [domChild, domParent, domGrandparent, body, html, document, window]
+ */
+
+export default function composedPath(evt) {
+  var path = (evt.composedPath && evt.composedPath()) || evt.path,
+    target = evt.target
+
+  if (path != null) {
+    // Safari doesn't include Window, and it should.
+    path = path.indexOf(window) < 0 ? path.concat([window]) : path
+    return path
+  }
+
+  if (target === window) {
+    return [window]
+  }
+
+  function getParents(node, memo) {
+    memo = memo || []
+    var parentNode = node.parentNode
+
+    if (!parentNode) {
+      return memo
+    } else {
+      return getParents(parentNode, memo.concat([parentNode]))
+    }
+  }
+
+  return [target].concat(getParents(target)).concat([window])
+}