Using Javascript to Set the Datasource for a Sparkline

I have a javascript interval that periodically changes (not refresh but completely change) the datasource for all controls on the page. I have a 3 sparklines that I need to change datasources for as well but I've yet to find an example of how to deal with them using javascript. Can you please help?

function update() {          setInterval(function () {                Getting instance of chart              var spark1Obj = document.getElementById('spark1').ej2_instances[0],               //...              Assigned data soruce              spark1Obj.dataSource = [{ xval: 'X1', yval: Math.floor(Math.random() * 6) + 1 },                  //...]              Refreshed the sparkline using refresh method              spark1Obj.refresh();               //...          }, 3000);      }