HTML_QuickForm_advmultiselect : The Definitive Guide

In a usability test with non-information workers in an intranet application, we could be surprised that none (or few) of the users successfully selected multiple responses when presented in a HTML select element with multiple selection enabled. They simply did not know that control click exist.

To solve this problem, the QuickForm advmultiselect element provides an interface that allow user-end to do their selection very easily. In this interface, there are:

For each new item to add to your selection, select it from the unselected list (source), then clic on the add button to move it to the selection list (destination). It does not exists in the source list after transfer.

For each item to remove from your selection, select it in the selected list (source), then clic on the remove button to move it to the unselected list (destination). It does not exists in the source list after transfer.