online-judge/resources/django_select2.js

(function ($) {
    var init = function ($element, options) {
        $element.select2(options);
    };

    var initHeavy = function ($element, options) {
        var settings = $.extend({
            ajax: {
                data: function (params) {
                    return {
                        term: params.term,
                        page: params.page,
                        field_id: $element.data('field_id')
                    };
                },
                processResults: function (data, page) {
                    return {
                        results: data.results,
                        pagination: {
                            more: data.more
                        }
                    };
                }
            }
        }, options);

        $element.select2(settings);
    };

    $.fn.djangoSelect2 = function (options) {
        var settings = $.extend({}, options);
        $.each(this, function (i, element) {
            var $element = $(element);
            if ($element.hasClass('django-select2-heavy')) {
                initHeavy($element, settings);
            } else {
                init($element, settings);
            }
        });
        return this;
    };

    $(function () {
        $('.django-select2:not([id*=__prefix__])').djangoSelect2({
            dropdownAutoWidth: true
        });
    });

    if ('django' in window && 'jQuery' in window.django)
        django.jQuery(document).on('formset:added', function(event, $row) {
            $row.find('.django-select2').each(function () {
                // Notice how we are passing it into a different jQuery.
                $(this).djangoSelect2({
                    dropdownAutoWidth: true
                })
            });
        });
}(jQuery));