Chosen is a JavaScript plugin for Prototype and jQuery that makes long, unwieldy select boxes much more user-friendly. For more information (including usage, explanation and faqs), check out the .
Chosen automatically highlights selected options and removes disabled options.
Chosen automatically sets the default field text ("Choose a country...") by reading the select element's title value. If no title value is present, it will default to "Select Some Option" or "Select Some Options" depending on whether the select is single or multiple. You can change these elements in the plugin js file as you see fit.
When working with form fields, you often want to perform some behavior after a value has been selected or deselected. Whenever a user selects a field in Chosen, it triggers a "change" event* on the original form field. That let's you do something like this:
$("#form_field").chosen().change( … );
Note: Prototype doesn't offer support for triggering standard browser events. is required to trigger the change event when using the Prototype version.
If you need to update the options in your select field and want Chosen to pick up the changes, you'll need to trigger the "liszt:updated" event on the field. Chosen will re-build itself based on the updated content.
$("#form_field").trigger("liszt:updated");
Event.fire($("form_field"), "liszt:updated");
Using Chosen is easy as can be.
$(".chzn-select").chosen()