A ‘double drop-down’ is a pair of linked ‘select’ inputs set up so that the options in the second drop-down change depending on the selection in the first drop-down: for example to select a country in the first drop-down and have the corresponding list of States/Regions show in the second drop-down.

Level: advanced, requires PHP, MySQL, JavaScript and Joomla! knowledge.

14 pages

This How-to Document links to the recipes ‘Using PHP to create ‘select’ drop-downs ’ and ‘Using Ajax to look up email addresses’ in Chapter 12 of the “ChronoForms 3.1 for Joomla! sites cookbook”.

Important: This document was written for ChronoForms v3 on Joomla! 1.5; it may be possible to adapt the contents to ChronoForms v4 and/or Joomla! 1.6 but this has not been tested.