title: Node.js call function if button clicked
body: <p>I have a function in my index.ejs which will be executed if you click on an image.</p>
  
  <pre><code>img.onclick = function() {playVideo();}
  </code></pre>
  
  <p>A Video will play, which works fine.</p>
  
  <p>But now I want to get a "notification" in node.js that the function was called / image was clicked. I don't want to send back data or get a var. I just want a function which will be executed in node.js.</p>
  
  <p>I work with node.js and express.js on a raspberry pi.</p>
  
  <p>Look for further infos in the comments.</p>