Chosen produce a search field with autocomplete and helps to find option.

This select:

before chosen

after

$("select").chosen({ placeholder_text_single: 'Choose an awesome website' });

will be replaced by this box:

after chosen

#chosen is a first-class plugin. It provides a lot of options, it looks great and your users will be happy to use it.

Here is other examples and github repo

#javascript #markup