Init

themes/hextra/assets/js/core/filetree.js

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+// Script for filetree shortcode collapsing/expanding folders used in the theme
+// ======================================================================
+document.addEventListener("DOMContentLoaded", function () {
+  const folders = document.querySelectorAll(".hextra-filetree-folder");
+  folders.forEach(function (folder) {
+    folder.addEventListener("click", function () {
+      Array.from(folder.children).forEach(function (el) {
+        el.dataset.state = el.dataset.state === "open" ? "closed" : "open";
+      });
+      folder.nextElementSibling.dataset.state = folder.nextElementSibling.dataset.state === "open" ? "closed" : "open";
+    });
+  });
+});