Using FusionCharts with JSP > Charting Data from an Array |
In this section, we'll show you how to use FusionCharts and JSP to plot
charts from data contained in JSP arrays - the same can then be extended to ArrayList or any other collection.
We'll cover the following examples here:
Before you go further with this page, we recommend you to please see the previous section "Basic Examples" as we start off from concepts explained in that page. The code examples contained in this page are present in Download Package > Code > J2EE > ArrayExample folder. |
Creating a single series chart from data contained in arrays |
The code to create a single series chart is contained in SingleSeries.jsp and can be listed as under: |
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://www.fusioncharts.com/jsp/core" prefix="fc" %>
<%@ taglib prefix="tags" tagdir="/WEB-INF/tags" %>
<jsp:useBean id="chartData"
class="com.fusioncharts.sampledata.ArrayRenderData"/>
<c:set var="folderPath" value="../../FusionCharts/"/>
<c:set var="title" value="FusionCharts - Array Example
using Single Series Column 3D Chart" scope="request"/>
<c:set var="header1" value="FusionCharts - Examples" scope="request"/>
<c:set var="header2" value="Plotting single series
chart from data contained in Array." scope="request"/>
<c:set var="jsPath" value="${folderPath}" scope="request"/>
<tags:template2>
<!-- In this example, we plot a single series chart from data contained in an array.
The array will have two columns - first one for data label and the next one for data values.-->
<!-- Create the chart - Column 3D Chart with data contained in bean -->
<fc:render chartId="${chartData.chartId}"
swfFilename="${folderPath}${chartData.filename}"
width="${chartData.width}" height="${chartData.height}" debugMode="false"
registerWithJS="false" xmlData="${chartData.xml}" />
</tags:template2> |
As is the best practice, there is hardly any code in the above jsp. The tag used to render the chart is fc:render. The data for the chart is obtained from the Java Bean class com.fusioncharts.sampledata.ArrayRenderData. As mentioned in the earlier examples, please do not forget to include the path to the folder containing the javascript files. This is achieved through the code: <c:set var="folderPath" value="../../FusionCharts/"/> Here, FusionCharts is the name of the folder containing FusionCharts.js, .swf and other JavaScript files. The bean containing the xml data is ArrayRenderData. In this bean, we define a JSP array arrData to store sales data for 6 different products. The array has two dimensions - first one for data label and the next one for data values. We define a variable xml to store the entire XML data. To build the XML, we iterate through the array and use string concatenation. Here is the code from ArrayRenderData.java relevant to constructing the Single series data xml : /* Let's store the sales data for 6 products in our array. We also store the name of products.*/ String[][] arrData = new String[6][2]; //Store Name of Products arrData[0][0] = "Product A"; arrData[1][0] = "Product B"; arrData[2][0] = "Product C"; arrData[3][0] = "Product D"; arrData[4][0] = "Product E"; arrData[5][0] = "Product F"; //Store sales data arrData[0][1] = "567500"; arrData[1][1] = "815300"; arrData[2][1] = "556800"; arrData[3][1]= "734500"; arrData[4][1] = "676800"; arrData[5][1] = "648500"; int i=0; //Initialize <chart> element xml = "<chart caption='Sales by Product' numberPrefix='$' formatNumberScale='0'>"; //Convert data to XML and append for(i=0;i<arrData.length;i++){ xml+= "<set label='" +arrData[i][0] + "' value='" + arrData[i][1] + "' />"; } //Close <chart> element xml+= "</chart>"; Finally, we render the chart using the fc:render tag and passing xml and other parameters. When you view the chart, you'll see a chart as under: |
Creating a multi-series chart from data contained in arrays |
Let us now create a multi-series chart from data contained in arrays. We create a file MultiSeries.jsp with the following code: |
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ taglib uri="http://www.fusioncharts.com/jsp/core" prefix="fc" %> <%@ taglib prefix="tags" tagdir="/WEB-INF/tags" %> <jsp:useBean id="chartData" class="com.fusioncharts.sampledata.ArrayRenderData"/> <c:set var="folderPath" value="../../FusionCharts/"/> <c:set var="title" value="FusionCharts - Array Example using Multi Series Column 3D Chart" scope="request"/> <c:set var="header1" value="FusionCharts - Examples" scope="request"/> <c:set var="header2" value="Plotting multi-series chart from data contained in Array." scope="request"/> <c:set var="jsPath" value="${folderPath}" scope="request"/> |
In the above code, we first set the value for the path to the javascript files (jsPath) to enable us embed the chart using JavaScript. We use the bean ArrayRenderData for providing the data to the chart. We use the fc:render tag wherever we want to render the chart.
Let's quickly take a look at the part of the code (function constructMultiSeriesXML() ) from the bean which constructs the xml for the Multi-series chart from the array. /* Let's store the sales data for 6 products in our array. We also store the name of products.*/ String[][] arrData = new String[6][3]; //Store Name of Products arrData[0][0] = "Product A"; arrData[1][0] = "Product B"; arrData[2][0] = "Product C"; arrData[3][0] = "Product D"; arrData[4][0] = "Product E"; arrData[5][0] = "Product F"; //Store sales data arrData[0][1] = "567500"; arrData[1][1] = "815300"; arrData[2][1] = "556800"; arrData[3][1]= "734500"; arrData[4][1] = "676800"; arrData[5][1] = "648500"; //Store sales data for previous year arrData[0][2]= "547300"; arrData[1][2] = "584500"; arrData[2][2]= "754000"; arrData[3][2]= "456300"; arrData[4][2]= "754500"; arrData[5][2]= "437600"; multiSeriesXml = "<chart caption='Sales by Product' numberPrefix='$' formatNumberScale='1' rotateValues='1' placeValuesInside='1' decimals='0' >"; //Initialize <categories> element - necessary to generate a multi-series chart String strCategories = "<categories>"; //Initiate <dataset> elements String strDataCurr = "<dataset seriesName='Current Year'>"; String strDataPrev = "<dataset seriesName='Previous Year'>"; //Iterate through the data for(int i=0;i<arrData.length;i++){ //Append <category label='...' /> to strCategories strCategories = strCategories + "<category label='" + arrData[i][0] + "' />"; //Add <set value='...' /> to both the datasets strDataCurr = strDataCurr + "<set value='" + arrData[i][1] + "' />"; strDataPrev = strDataPrev + "<set value='" + arrData[i][2] + "' />"; } //Close <categories> element strCategories = strCategories + "</categories>"; //Close <dataset> elements strDataCurr = strDataCurr + "</dataset>"; strDataPrev = strDataPrev + "</dataset>"; //Assemble the entire XML now multiSeriesXml+= strCategories + strDataCurr + strDataPrev + "</chart>"; Here, we define an array arrData to store sales data for 6 different products. The array has three dimensions - first one for data label (product) and the next two for data values. The first data value column would store sales information for current year and the second one for previous year. We define a variable multiSeriesXml to store the entire XML data. We also define strCategories, strDataCurr and strDataPrev variables to store XML data for categories elements, current year's dataset and previous year's dataset respectively. To build the XML, we iterate through the array and use string concatenation. We concatenate the entire XML finally in multiSeriesXml. Finally, we render the chart using fc:render tag and passing multiSeriesXml from the bean, as an attribute. When you view the chart, you'll see a chart as under: |
In Download Package > Code > J2EE > ArrayExample, we've more example codes to create Stacked and Combination Charts too, which have not been explained here, as they're similar in concept. You may directly see the code and understand them easily. |