Charting using Janus Web Server and FusionCharts Free

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Background

You've created a beautiful web site, but the only thing missing is a way to easily add bar graphs, pie charts, or other business graphics. Fortunately, there is an easy way to do this at little or no cost using FusionCharts Free from InfoSoft Global Ltd. FusionCharts Free supports a generous number of business charts. Of course, for more sophisticated options, there is a more full featured version, for which you must pay a license fee.

Disclaimer

This tutorial should not be construed as an endorsement of FusionCharts Free or InfoSoft Global Ltd.. It is presented only as an example of how one can easily add business charts to Janus Web Server applications.

Chart Types Supported

FusionCharts Free supports the following chart types:

Bar Charts (2D and 3D)
Pie Charts (2D and 3D)
Doughnut Charts
Line Charts
Area Charts
Stacked Charts
Combination (Line & Bar) Charts
Candlestick Charts
Funnel Charts
Gantt Charts

At this writing, there are 22 different charts, which are rendered as Adobe Flash (.swf) files in the browser using JavaScript.

Getting Started

The first step in using FusionCharts is to download the source, which you can find on the FusionCharts Free web site. After downloading the JavaScript files, you need to upload them to a Model 204 file. The easiest way to do this is to use the Sirius FTP capability (see the Janus Sockets Reference Manual, Chapter 12). If you do not have Janus Sockets, you can use HTTP PUT or a Mainframe FTP package to get the files to your machine and subsequently to a Model 204 procedure file.

Hint: When you upload the files to your Janus Web procedure file, upload them as binary files to avoid the dreaded "Code Page" issue. You must then add a Janus Web rule to send them to the browser as "binary". The data that will populate your chart will come from an XML file that is either created by another program specified by a URL, or that is coded directly in the charting program.

Using FusionCharts Free with Janus Web

Once you have uploaded your FusionCharts Free JavaScript files to your server and added appropriate Janus Web rules to send them to the browser, you are ready to code a Janus Web application to chart your data. You might also need to add a web rule to use Adobe Flash for .swf files. I find the "Data URL" method (see FusionCharts Free documentation) the easiest. In your Janus Web program, you would add a container for your chart and the JavaScript code to call the chart-type JavaScript and also your data URL.

Note: If your data URL program is being passed parameters, the URL must be URL Encoded using the Sirius $Web_URL_Encode function or the JavaScript "escape()" method.

In the <head> section of your HTML file you will need to include the following:

 <SCRIPT LANGUAGE="Javascript" SRC="/FusionCharts/FusionCharts.js"></SCRIPT>

You may need to modify the path name depending on your Janus Web rules.

You then add the following code in the <body> section of the HTML:

  ...
   HTML
  <div id="chart1div">This text is replaced by the chart
  </div>
  <script type="text/javascript">
   var chart1 = new FusionCharts("Pie2D.swf", "ChId1", "600", "400", "0", "0"); 
   //To pass parameters, URLEncode the dataURL. Use escape() in JavaScript 
   chart1.setDataURL(escape("Data.URL?id=1&subId=2"));
   chart1.render("chart1div");
  </script>
   END HTML
   ...

Assuming you have coded everything properly, the FusionCharts Column2D.swf JavaScript will call the Data.URL User Language program, which will return an XML file properly formatted for creating a FusionCharts 2D Column Chart. Here is an example of a Column2D XML file:

 <graph caption='Pie Chart' decimalPrecision='0' showPercentageValues='0' showNames='1' numberPrefix='$' showValues='1' showPercentageInLabel='0' pieYScale='45' pieBorderAlpha='100' pieRadius='100' animation='0' shadowXShift='4' shadowYShift='4' shadowAlpha='40' pieFillAlpha='95' pieBorderColor='FFFFFF'> 
  <set value='25' name='Item A' color='AFD8F8'/>
  <set value='17' name='Item B' color='F6BD0F'/>
  <set value='23' name='Item C' color='8BBA00' isSliced='1'/>
  <set value='65' name='Item D' color='A66EDD'/>
  <set value='22' name='Item E' color='F984A1'/>
  </graph>

Debugging

If you see "JavaScript Error" at the bottom of the page, it may be caused by one of the following:

You actually made an error typing your JavaScript. Remember that JavaScript is case sensitive.
There is a problem with your Janus Web rules. Check SirScan, and look for Janus Web rule problems.
There is a problem with the DataURL program or Janus Web rules.
Your XML data is not in the proper format or is not well-formed.

Additional Capabilities

You can add even more punch to your FusionCharts data: you can add a drill-down capability by adding a URL to the XML data for a particular Bar or Slice of a chart. You would need to add the link property to the set value for a bar or slice.

 <set name='Jan' value='17400' link='n-DemoLinkPages/DemoLink1.html' color='AFD8F8' />

Note: The n- prefix to the link indicates that it is to open in a new window. Leave this off if you want to replace the active page.