The Book of JavaScript, 2nd Edition

Assignment

To make sure you understand everything in this chapter, try this assignment.

Write a script that creates bar charts. This script should first ask a visitor how many bars to include in the chart. If the visitor wants four bars, the script should then ask for four numbers, ranging from 1 to 10, and draw a bar for each. Figure 8-20 through Figure 8-22 demonstrate what I mean. To draw the bars, create a square GIF, or use square.gif, which is available at http://www.bookofjavascript.com/Chapter08/square.gif. If someone wants a bar that's ten squares high, use a loop to write

window.document.writeln("<img src='square.gif'>")

ten times to the page. This is another tough assignment, so give yourself plenty of time to do it.

Figure 8-20. Asking ...