How do I use esriRequest in a widget?

MathiasKP

Hello, can anyone guide me in a direction on how to use the esriRequest function in a Web Appbuilder Widget?

I have just started using Web AppBuilder Developer Edition. I started with extending the sample widget Demo with a button

Widget.html:

<div>
<button id="gotoPosition" data-dojo-type="dijit/form/Button" type="button" data-dojo-attach-point="gotoPosition">Go to position</button>
</div>

I then extended the onOpen: function() in widget.js to zoom to a position

  ...
 onOpen: function(){
  console.log('onOpen');
  var map = this.map;
  var Long, Lat;
  var LocPoint, point;   
  //Go to position
  on(this.gotoPosition, 'click', lang.hitch(this, function(evt){   
    console.log('gotoPosition 2');
    map.graphics.clear();
    Lat = 55;
    Long = 15;
    LocPoint = new Point([Long,Lat]);
    map.centerAndZoom(LocPoint,17);
    }));
  },
...