title: How to add zoom in zoom out buttons in visjs using angularjs?
body: <p>Need help in having a zoom in and zoom out button in <a href="http://visjs.org/docs/network/" rel="nofollow">visjs network graph</a> using angularjs, I could not find any relevant options for this. Please help, I am also providing a <a href="http://plnkr.co/edit/0LQidVPnOSLhyydsoTwD?p=preview" rel="nofollow">plunker link</a> as an example</p>
  
  <p>Code</p>
  
  <pre><code>&lt;vis-network data="data" options="options" height="100%"&gt;&lt;/vis-network&gt;
  
  $scope.options = {
    autoResize: true,
    height: '800',
    width: '100%'
  };
  </code></pre>