Contents:

Select-and-Go Navigation
Changing Menus Dynamically
Making Fields Required
Checking Fields against Each Other
Identifying Problem Fields
Putting Form Validation into Action
Working with Radio Buttons
Setting One Field with Another
Validating Zip Codes
Validating Email Addresses

Return to Chapter 7

To use this script on your own page, click in the text area below, select all, and copy to grab the script. Then, just paste into your own page — and you're done.

Changing Menus Dynamically

See it run: Changing Menus Dynamically

Script 7.3

This HTML file sets up a menu with the months of the year; the following JavaScript will populate a second menu with the number of days in the month after the user chooses a month.

Script 7.4

When the user picks a month from the first pop-up menu, this JavaScript populates a second pop-up menu with the correct number of days for the selected month.