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Primefaces - Exporting Chart

[Updated: Jul 10, 2018, Created: Jul 9, 2018]

Following example shows how to export Chart component as an image.

View

src/main/webapp/index.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:ui="http://java.sun.com/jsf/facelets">
<h:head></h:head>
<h:body style="margin-left:50px">
    <h2>PrimeFaces Exporting Chart</h2>
    <p:chart type="line"
             model="#{lineChartBean.lineModel}"
             style="height:200px;width:300px"
             widgetVar="chart"/>
    <h:form>
        <h:commandButton id="login"
                         value="Export as image"
                         onclick="return downloadImage();"
                         type="Submit" />
    </h:form>

    <script type="application/javascript">
       function downloadImage(){
       var image = PF('chart').exportAsImage();
       var imageSrc = $(image).attr('src');
       var url = imageSrc.replace(/^data:image\/[^;]+/, 'data:application/octet-stream');
       var link = document.createElement('a');
       link.download = "chart.png";
       link.href = url;
       document.body.appendChild(link);
       link.click();
       document.body.removeChild(link);
       return false;
    }
    </script>
</h:body>
</html>

Managed Bean

@ManagedBean
@ViewScoped
public class LineChartBean {
  private LineChartModel lineModel;

  @PostConstruct
  public void init() {
      lineModel = new LineChartModel();
      LineChartSeries s = new LineChartSeries();
      s.setLabel("Population");

      s.set(1, 5.20);
      s.set(2, 19.63);
      s.set(3, 59.01);
      s.set(4, 139.76);
      s.set(5, 300.4);
      s.set(6, 630);

      lineModel.addSeries(s);
      lineModel.setLegendPosition("e");
      Axis y = lineModel.getAxis(AxisType.Y);
      y.setMin(0.5);
      y.setMax(700);
      y.setLabel("Millions");

      Axis x = lineModel.getAxis(AxisType.X);
      x.setMin(0);
      x.setMax(7);
      x.setTickInterval("1");
      x.setLabel("Number of Years");
  }

  public LineChartModel getLineModel() {
      return lineModel;
  }
}

Running

To try examples, run embedded tomcat (configured in pom.xml of example project below):

mvn tomcat7:run-war

Output

Clicking on 'Export as image' will download the image.

Example Project

Dependencies and Technologies Used:

  • primefaces 6.1 primefaces
  • jsf-api 2.2.14: This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
  • jsf-impl 2.2.14: This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
  • jstl 1.2 javax.servlet:jstl
  • JDK 1.8
  • Maven 3.5.4

Download chart as image Select All Download
  • primefaces-export-chart
    • src
      • main
        • java
          • com
            • logicbig
              • example
        • webapp
          • index.xhtml

    See Also