Unable to use functions in AdHoc chart advanced properties

Hi Everyone,

When using a chart in AdHoc view in jasper server, i am unable to use functions in advanced chart formatting. For example, i want to truncate the data labels on xAxis, i tried using xAxis.labels.formatter and it's expression as function(){return this.value.substring(2, 5);}. After applying this property, i am unable to see the chart and getting an error : Uncaught javascript error. Can someone help me out in this?

Thanks,

Narendra