diff --git a/app/mindmap/buffer.py b/app/mindmap/buffer.py
index b20a0ed..7bc747c 100644
--- a/app/mindmap/buffer.py
+++ b/app/mindmap/buffer.py
@@ -31,11 +31,13 @@ class AppBuffer(BrowserBuffer):
         self.url = "file://" + (os.path.join(os.path.dirname(__file__), "index.html"))
         self.buffer_widget.setUrl(QUrl(self.url))
 
-    def add_sub_node(self):
-        self.buffer_widget.eval_js("add_node();")
+        for method_name in ["zoom_in", "zoom_out", "zoom_reset", "add_sub_node", "remove_node"]:
+            self.build_js_method(method_name)
 
-    def remove_node(self):
-        self.buffer_widget.eval_js("remove_node();")
+    def build_js_method(self, method_name):
+        def _do ():
+            self.buffer_widget.eval_js("{}();".format(method_name))
+        setattr(self, method_name, _do)
 
     def update_node_topic(self):
         self.send_input_message("Update topic: ", "update_node_topic")
diff --git a/app/mindmap/index.html b/app/mindmap/index.html
index 2fdb8ab..ee5894f 100644
--- a/app/mindmap/index.html
+++ b/app/mindmap/index.html
@@ -33,12 +33,14 @@
                  theme:'greensea',
                  editable:true
              }
+
              _jm = jsMind.show(options);
+             _jm.select_node("root");
          }
 
          open_empty();
 
-         function add_node(){
+         function add_sub_node(){
              var selected_node = _jm.get_selected_node(); // as parent of new node
              if(!selected_node) {
                  _jm.move_node(selected_id,'_first_');
@@ -60,6 +62,7 @@
          function remove_node(){
              var selected_id = get_selected_nodeid();
              if(selected_id) {
+                 _jm.select_node(_jm.get_selected_node().parent);
                  _jm.remove_node(selected_id);
              }
          }
@@ -70,6 +73,18 @@
                  _jm.update_node(selected_id, topic);
              }
          }
+
+         function zoom_in() {
+             _jm.view.zoomIn();
+         };
+
+         function zoom_out() {
+             _jm.view.zoomOut();
+         };
+
+         function zoom_reset() {
+             _jm.view.setZoom(1);
+         }
         </script>
     </body>
 </html>
diff --git a/eaf.el b/eaf.el
index 6aa050f..c7b39ff 100644
--- a/eaf.el
+++ b/eaf.el
@@ -423,6 +423,10 @@ Try not to modify this alist directly.  Use `eaf-setq' to modify instead."
     ("DEL" . "remove_node")
     ("M-o" . "remove_node")
     ("M-m" . "update_node_topic")
+    ("M-r" . "refresh_page")
+    ("C--" . "zoom_out")
+    ("C-=" . "zoom_in")
+    ("C-0" . "zoom_reset")
     )
   "The keybinding of EAF Mindmap."
   :type 'cons)
@@ -1283,7 +1287,7 @@ This function works best if paired with a fuzzy search package."
                    (if history-file-exists
                        (mapcar
                         (lambda (h) (when (string-match history-pattern h)
-                                  (format "[%s] ⇰ %s" (match-string 1 h) (match-string 2 h))))
+                                      (format "[%s] ⇰ %s" (match-string 1 h) (match-string 2 h))))
                         (with-temp-buffer (insert-file-contents browser-history-file-path)
                                           (split-string (buffer-string) "\n" t)))
                      nil)))