Often, we find we need to present our users with a list of items in a table or list, with checkboxes such that the user can select one or more items from the list for additional processing. Most of the time, the user will either be selecting a few items from the list but leaving most unchecked, or selecting all or most of the items from the list and leaving very few items unchecked. In these cases, it is handy to offer the user a means to "Select All" or "Select None" which then toggles the checked state of the entire list. The common means to do this is with one more checkbox, global to the list itself, which performs the toggling action. One way to do this is to use JQuery.