X52.9755 Lecture 9: Thursday, April 16, 1998

In-class examples

1. A function with an argument. (Last week's had no argument.)
2. Find the x, y coördinates of a pixel in an image. World Wide Web Consortium documentation for
   <IMG ISMAP>
3. Image replacement in an event handler. Netscape documentation for
   • Image.src
4. Cache the images in memory before you use them.
5. Consolidate similar event handlers into one function. (Previous example of a function with no arguments.) Netscape documentation for
   • function
6. Do the same thing with links instead of <AREA>'s.
7. Do something once in the future. Netscape documentation for
   • Window.setTimeout
   • String.charAt
   • String.substring
8. Do something over and over in the future.
9. How much longer do we have to sit here?
10. Cycle the background color. If you add 5 * pi / 6 to the value of sin, the sum is positive for 2/3 of the interval from 0 to 2 * pi.
11. In Handout 8, we put event handlers in a form. In Handout 9, the event handlers are consolidated into a function.
12. Do arithmetic in the event handlers.
13. Handle individual keystrokes. Netscape documentation for
    • the event object
14. Open a new window. Netscape documentation for
    • Window.open