This example generates several graphs of sales data that can be accessed from a single Web page. The graphs are two bar charts of summary sales data and three pie charts that break the data down by ...

In this example, the data, the bar chart, and the reports are simple so that you can focus on the code needed to generate a drill-down graph. For more realistic drill-down examples, see Creating Bar ...

Bar charts are usually the go-to method for visualizing data similar to this example. However, if the category names are long, they'd be cluttered in the tiny space that a bar chart provides.

Gantt charts serve as a universal language for project teams. In a product launch, for example, team members from research, development, and marketing can all refer to the same visual timeline.

Pie charts also do badly when there are lots of categories. For example, this chart from a study on data sources used for COVID data visualisation shows hundreds of categories in one pie.