Created: 2008-09-24 09:12
Updated: 2015-11-09 21:25
License: mit



SelectAutocomplter is a plugin for MooTools (1.2) and Prototype (1.6) (see branches) that provides a way to create an editable <select>. It works by replacing a <select> in your document with a text field that uses the Quicksilver filtering algorithm to narrow down results.

Example Image

Recommended Uses:

  • User lists
  • Company lists
  • Dropdowns with many items

The Javascript is 100% unobtrusive and will fall back to a <select> tag for users without Javascript enabled. It's keyboard accessible and will respond to up/down arrow and enter/return keys as expected.

How to use

To activate the control, call new SelectAutocompleter(element, options) on any <select> tag you would like to replace. Your server will receive the same response as if the <select> was not replaced, so no backend work is needed.

Any class names on the <select> element will be carried over to the <input> that replaces it as well as the <ul> containing the results.


  • cutoffScore - A decimal between 0 and 1 determining what Quicksilver score to cut off results for. Default is 0.1. Use higher values to show more relevant, but less results.
  • template - A string describing the template for the drop down list item. Default variables available: rawText, highlightedText. Default value is "{highlightedText}" Use in conjunction with templateAttributes to build rich autocomplete lists.
  • templateAttributes - An array of attributes on the <option> element SelectAutocompleter should use for its template


There are two events mixed in - onFocus (when the autocompleter takes focus) and onBlur (when the autocompleter loses focus)


See index.html for a working example.


License is MIT. See LICENSE file.


  • Add a trigger to show the list without typing in the box (similar to clicking the down arrow on a select field)
  • Add in effects to make it smoother
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