Step Charts

Step charts contain multiple sets of data. A step chart steps between the points of data, resembling steps. Each data series (created with the addColumns() method) is defined with a new instance of the MultiValueColumn object, which takes an ID and a set of values. This tutorial shows how to configure your portlet to use step charts.

Follow these steps:

1. Import the chart taglib along with the StepChartConfig and MultiValueColumn classes into your bundle’s init.jsp file:

   <%@ taglib prefix="chart" uri="http://liferay.com/tld/chart" %>
   <%@ page import="com.liferay.frontend.taglib.chart.model.point.step.StepChartConfig" %>
   <%@ page import="com.liferay.frontend.taglib.chart.model.MultiValueColumn" %>
   

2. Add the following Java scriptlet to the top of your view.jsp:

   <%
   StepChartConfig _stepChartConfig = new StepChartConfig();
   
   _stepChartConfig.addColumns(
     new MultiValueColumn("data1", 100, 20, 30),
     new MultiValueColumn("data2", 20, 70, 100)
   );
   %>
   

3. Add the <chart> taglib to the view.jsp, passing the _stepChartConfig as the config attribute’s value:

   <chart:step
     config="<%= _stepChartConfig %>"
   />
   

Figure 1: A step chart steps between the points of data, resembling steps.

You can also use an area step chart if you prefer. An area step chart highlights the area covered by a step graph.

<chart:area-step
  config="<%= _stepChartConfig %>"
/>

Figure 2: An area step chart highlights the area covered by a step graph.

Related Topics

Line Charts

Spline Charts

Scatter Charts