Fixed #953 - Added zoom events from keyboard and navigation buttons.

HISTORY.md

@@ -15,6 +15,7 @@ http://visjs.org
 - Fixed recursion error when node is fixed but has no position.
 - Fixed accidental redrawing during stabilization.
 - Fixed delete callbacks with null argument not showing toolbar afterwards.
+- Added zoom events from keyboard and navigation buttons.
 
 ## 2015-06-16, version 4.3.0
 

lib/network/modules/components/NavigationHandler.js

@@ -145,8 +145,13 @@ class NavigationHandler {
   _moveDown() {this.body.view.translation.y -= this.options.keyboard.speed.y;}
   _moveLeft() {this.body.view.translation.x += this.options.keyboard.speed.x;}
   _moveRight(){this.body.view.translation.x -= this.options.keyboard.speed.x;}
-  _zoomIn()   {this.body.view.scale         *= 1+this.options.keyboard.speed.zoom;}
-  _zoomOut()  {this.body.view.scale         /= 1+this.options.keyboard.speed.zoom;}
+  _zoomIn()   {
+    this.body.view.scale         *= 1+this.options.keyboard.speed.zoom;
+    this.body.emitter.emit('zoom', {direction: '+', scale: this.body.view.scale});}
+  _zoomOut()  {
+    this.body.view.scale         /= 1+this.options.keyboard.speed.zoom;
+    this.body.emitter.emit('zoom', {direction: '-', scale: this.body.view.scale});
+  }
 
 
   /**