init

static/admin/js/autocomplete.js

@@ -0,0 +1,41 @@
+'use strict';
+{
+    const $ = django.jQuery;
+    const init = function($element, options) {
+        const settings = $.extend({
+            ajax: {
+                data: function(params) {
+                    return {
+                        term: params.term,
+                        page: params.page,
+                        app_label: $element.data('app-label'),
+                        model_name: $element.data('model-name'),
+                        field_name: $element.data('field-name')
+                    };
+                }
+            }
+        }, options);
+        $element.select2(settings);
+    };
+
+    $.fn.djangoAdminSelect2 = function(options) {
+        const settings = $.extend({}, options);
+        $.each(this, function(i, element) {
+            const $element = $(element);
+            init($element, settings);
+        });
+        return this;
+    };
+
+    $(function() {
+        // Initialize all autocomplete widgets except the one in the template
+        // form used when a new formset is added.
+        $('.admin-autocomplete').not('[name*=__prefix__]').djangoAdminSelect2();
+    });
+
+    $(document).on('formset:added', (function() {
+        return function(event, $newFormset) {
+            return $newFormset.find('.admin-autocomplete').djangoAdminSelect2();
+        };
+    })(this));
+}