FusionWidgets spark column chart allows to show period blocks on the chart using colored bands. This helps you easily interpret periods on the chart. For example, if you want to show 3 months period block on the chart, set:
<chart ... periodLength='3' periodColor='CCCCCC' periodAlpha='50'>
Here, we've set periodLength='3' as we've specified monthly data - so, 3 data points make 3 months. This will result in: |