hard page refresh using highcharts

hard page refresh using highcharts

I am using highcharts to display the chart. When I select one item from
dropdown list it is showing data in the chart.
For example, the first item (arrayList) has 500 data points, second
item(arrayList) has 1000 data points, and third item(arrayList) has 1500
data points. When I select first item it is showing 500 data points in the
chart. When I select second item it is showing 1000 data points in the
chart. But when I select first item after selecting second item the chart
showing 1000 data points (the first arrayList is getting the second
arrayList size).
If I do the hard refrsh on page, ten it is showing exact data that I want.
But I dont know how can I code for hard refresh of a page in highchart.
Any suggestion?