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Jakarta Struts Cookbook
book

Jakarta Struts Cookbook

by Bill Siggelkow
February 2005
Intermediate to advanced content levelIntermediate to advanced
528 pages
12h 53m
English
O'Reilly Media, Inc.
Content preview from Jakarta Struts Cookbook

4.1. Creating a Horizontal Bar Chart

Problem

You want to create a simple data-driven horizontal bar chart on a web page without using an applet or graphics library.

Solution

Use nested HTML tables with the width percentages calculated dynamically:

<table border="0">
  <logic:iterate id="row" name="foo" property="bar">
    <tr>
      <td align="right" width="20%">
        <bean:write name"row" property="label"/>
      </td>
      <td align="left" width="80%">
        <table width='<bean:write name="row" 
                              property="percentage"/>%' 
             bgcolor="blue">
          <tr>
            <td align="right">
              <font color="white">
                <bean:write name="row" 
                        property="percentage"/>%
              </font>
            </td>
          </tr>
        </table>
      </td>
    </tr>
  </logic:iterate>
</table>

Discussion

Displaying tables of raw numeric data may satisfy the functional requirements of your application, but outputting this information in a graph can make a tremendous difference to your end users. However, as soon as you start talking about graphics, the groans begin. Should you buy a reporting engine? What about a graphics-rendering framework? Do you need both? In many situations, if your application requirements can be met fairly by bar graphs, a combination of some clever HTML and Struts can do the work for you.

Consider a web application that displays weather forecast information. The application needs to display a bar chart that shows the chance of precipitation for the upcoming week. You'll create the WeeklyWeather class that holds the weather forecast as shown Example 4-1.

Example 4-1. JavaBean containing weather-related ...

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Publisher Resources

ISBN: 059600771XSupplemental ContentErrata Page