title: SAPUI5 call function from the another function in the same controller
body: <p>I was trying to make my code look more clean by storing some function code in a own function. However this did not work out. No error is logged in the console. </p>
  
  <p>This is my code:</p>
  
  <pre><code>onPressScan: function() {
  sap.ndc.BarcodeScanner.scan(
      // calling the function at this point works
      function(mResult) {
          if (!mResult.cancelled) {
              // call another function from the same controller
              this.handleData(mResult.text);
          }
      },
      function(Error) {
          sap.m.MessageBox.error("Scanning failed due to following error: " + Error, {
              title: "Error while scanning"
          });
      }
  ),
  
  handleData: function(data) {
  sap.m.MessageBox.success("Calling function worked: " + data, {
      title: "Success"
  });
  }
  </code></pre>
  
  <p>For testing purpose I minimized the handleData function to a minimum. What I just tried was calling the function one layer above (not threw two function calls...). This works. However, I need to call the function where you can see it in the code. How can I achieve that?</p>
  
  <p>Thank you. </p>