export dialog to choose export format, closes #207

src/public/javascripts/dialogs/export_subtree.js

@@ -0,0 +1,36 @@
+import treeService from '../services/tree.js';
+import server from '../services/server.js';
+import treeUtils from "../services/tree_utils.js";
+import exportService from "../services/export.js";
+
+const $dialog = $("#export-subtree-dialog");
+const $form = $("#export-subtree-form");
+const $noteTitle = $dialog.find(".note-title");
+const $exportFormat = $dialog.find("input[name='export-format']:checked");
+
+async function showDialog() {
+    glob.activeDialog = $dialog;
+
+    $dialog.modal();
+
+    const currentNode = treeService.getCurrentNode();
+    const noteTitle = await treeUtils.getNoteTitle(currentNode.data.noteId);
+
+    $noteTitle.html(noteTitle);
+}
+
+$form.submit(() => {
+    const exportFormat = $exportFormat.val();
+
+    const currentNode = treeService.getCurrentNode();
+
+    exportService.exportSubtree(currentNode.data.branchId, exportFormat);
+
+    $dialog.modal('hide');
+
+    return false;
+});
+
+export default {
+    showDialog
+};