Change Javascript Chart

[matija]

I use chartjs.org in my HTML template with variables

<script>
var cType="bar";
var xValues=["Item1","Item2","Item3"];
var yValues=[34,12,45];
....

</script>

I will with IWButton click change this variables and draw chart?

I tried with WebApplication.CallBackResponse.AddJavaScriptToExecuteAsCDATA('var cType = "line";'); and not work!

Maybe is any variant this implementation with RegisterCallBack for change my variables?