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2014

With RichFaces 4.5.0 comes a new component for rendering charts, built on the Flot JavaScript library (www.flotcharts.org).

 

Chart

 

A simple chart can be created like this:

<rich:chart title="Basic trigonometry">
    <rich:chartSeries label="sin(x)" type="line">
        <a4j:repeat value="#{sineBean.sinX}" var="point">
            <rich:chartPoint x="#{point.x}" y="#{point.y}" />
        </a4j:repeat>
    </rich:chartSeries>
</rich:chart>






chart1.png

NOTE: The naming of chart-related components was changed in 4.5.0.CR1, if you've already started using the chart component you will need to change the tags.

 

rich:chart

besides the standard the attributes like id, style or rendered also enables event handling (more below)

 

rich:chartSeries

sets the type of the chart (line, bar or pie) and a label, it can also be used set the color for the series and the style of the points.

 

rich:chartPoint

defines the "x" and "y" values of a point in the series.

 

A single chart can contain more than one series:

<rich:chart title="More basic trigonometry">
    <rich:chartSeries label="sin(x)" type="line" symbol="circle" color="blue">
        <a4j:repeat value="#{sineBean.sinX}" var="point">
            <rich:chartPoint x="#{point.x}" y="#{point.y}" />
        </a4j:repeat>
    </rich:chartSeries>
    <rich:chartSeries label="2*sin(x)" type="line" symbol="square" color="red">
        <a4j:repeat value="#{sineBean.twoSinX}" var="point">
            <rich:chartPoint x="#{point.x}" y="#{point.y}" />
        </a4j:repeat>
    </rich:chartSeries>
    <rich:chartSeries label="cos(2*x)" type="line" symbol="diamond" color="green">
        <a4j:repeat value="#{sineBean.cosTwoX}" var="point">
            <rich:chartPoint x="#{point.x}" y="#{point.y}" />
        </a4j:repeat>
    </rich:chartSeries>
</rich:chart>






chart2.png

There are three more tags that can be included in rich:chart to further customize the chart's appearance:

 

rich:chartLegend

can be used to specify the position of the legend and ordering of the labels

<rich:chartLegend position="sw" sorting="ascending" />



 

rich:chartXAxis and rich:chartYAxis

can be used to specify minimum and maximum values or labels of the axes, and also to insert padding (whitespace) on the ends of an axis

<rich:chartXAxis label="Relevant months" min="2" max="9" />


Chart Types

Besides line charts the component can also render bar and pie charts (defined by type attribute of chartSeries, line and bar series can be combined in a single chart):

barchart.pngpiechart.png


Event handling

Chart offers two custom events that can be listened to:

plothover

triggers when mouse is hovered over the chart

plotclick

triggers when a part of the chart is clicked (a bar, a slice or a point)


The event listeners (onplothover, onplotclick) can be defined for the whole chart or separately for each series.


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