app/assets/javascripts/cdx/admin/shared/select2.js
Cdx.ready(function () {
$('.select2-simple').select2({
width: '100%',
minimumResultsForSearch: Infinity
});
$('.select2-simple-search').select2({
width: '100%',
minimumResultsForSearch: 1
});
$('.select2-multiple').select2({
width: '100%',
minimumResultsForSearch: 1,
multiple: true
});
});