I managed to put something together, not perfect, but it works.
https://jsfiddle.net/Lkkm2L48/7/
jQuery(function($) {
$.fn.select2.amd.require([
'select2/selection/single',
'select2/selection/placeholder',
'select2/selection/allowClear',
'select2/dropdown',
'select2/dropdown/search',
'select2/dropdown/attachBody',
'select2/utils'
], function (SingleSelection, Placeholder, AllowClear, Dropdown, DropdownSearch, AttachBody, Utils) {
var SelectionAdapter = Utils.Decorate(
SingleSelection,
Placeholder
);
SelectionAdapter = Utils.Decorate(
SelectionAdapter,
AllowClear
);
var DropdownAdapter = Utils.Decorate(
Utils.Decorate(
Dropdown,
DropdownSearch
),
AttachBody
);
var base_element = $('.select2-multiple2')
$(base_element).select2({
placeholder: 'Select multiple items',
selectionAdapter: SelectionAdapter,
dropdownAdapter: DropdownAdapter,
allowClear: true,
templateResult: function (data) {
if (!data.id) { return data.text; }
var $res = $('<div></div>');
$res.text(data.text);
$res.addClass('wrap');
return $res;
},
templateSelection: function (data) {
if (!data.id) { return data.text; }
var selected = ($(base_element).val() || []).length;
var total = $('option', $(base_element)).length;
return "Selected " + selected + " of " + total;
}
})
});
});
CSS:
.select2-results__option .wrap:before{
font-family:fontAwesome;
color:#999;
content:"\f096";
width:25px;
height:25px;
padding-right: 10px;
}
.select2-results__option[aria-selected=true] .wrap:before{
content:"\f14a";
}