Chosen

Specifically built to deal with large & long select boxes, it also has support for multiple select boxes and optgroups.

A MooTools version is also available.

What is new in this release:

• Option to include group name in selected results

What is new in version 1.4.2:

• Option to include group name in selected results

What is new in version 1.3.0:

• Trigger ready event only after full instantiation.
• Added support for optgroup classes inheritance.

What is new in version 1.1.0:

• Added chosen:close triggerable event to go with chosen:open.
• Empty search triggers chosen:no_results event.

What is new in version 1.0.0:

• All CSS class names have been renamed from a chzn- root to a chosen- root.
• All custom Chosen events starting with liszt are now prefaced with a chosen.

What is new in version 0.14.0:

• Optionally hide selected & disabled options.
• Chosen disabled by default on iPhone/iPod/Android mobile device.
• Single backspace clears choices.
• Prevent text selection on Chosen.
• No longer expose classes to window context.
• Single select value fix.
• Remove javascript:void and attr references.
• Always clear result highlight.
• Replace characters only once.

What is new in version 0.13.0:

• Fixed:
• Search optgroups.
• Change search match style.
• Remove memoization of search field width.
• Remove Chosen's ID dependency.
• Rebuild Search Results After liszt:updated.

What is new in version 0.11.1:

• Makes all changes in CoffeeScript files, not JavaScript files.
• Uses Grunt to build the JavaScript files.

What is new in version 0.10.0:

• Show disabled options.
• Only attempt to hide the dropdown if it's showing.
• Add more margin for single selects with allow_single_deselect.

What is new in version 0.9.15:

• Wrap for attribute in quotes.
• Ensure choice count is reflective of actual selected item count.
• Deleted choice refactor.
• Fixed scroll issue in Prototype version.

What is new in version 0.9.13:

• Better container reference.
• Fix issue when destroying last choice.
• Use selectedIndex for tracking change events.
• Better IE disabling.
• Dropdown use CSS positioning for top position.
• Fix bug when deleting last item.
• Percentage width support.
• CSS centering fix.
• Use new CoffeeScript.

Requirements:

• JavaScript enabled on client side
• jQuery 1.4 or higher
• Prototype 1.7 or higher