Initial

resources/app/client/apps/dialogs/folder-export.js

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+/**
+ * A Dialog subclass which allows the user to configure export options for a Folder
+ * @extends {Dialog}
+ */
+class FolderExport extends Dialog {
+
+  /** @override */
+  activateListeners(html) {
+    super.activateListeners(html);
+    html.find('select[name="pack"]').change(this._onPackChange.bind(this));
+  }
+
+  /* -------------------------------------------- */
+
+  /**
+   * Handle changing the selected pack by updating the dropdown of folders available.
+   * @param {Event} event   The input change event
+   */
+  _onPackChange(event) {
+    const select = this.element.find('select[name="folder"]')[0];
+    const pack = game.packs.get(event.target.value);
+    if ( !pack ) {
+      select.disabled = true;
+      return;
+    }
+    const folders = pack._formatFolderSelectOptions();
+    select.disabled = folders.length === 0;
+    select.innerHTML = HandlebarsHelpers.selectOptions(folders, {hash: {
+      blank: "",
+      nameAttr: "id",
+      labelAttr: "name"
+    }});
+  }
+}