Django实现jquery select2带搜索的下拉框

<script src="/static/jquery-3.4.1.js"></script>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="/static/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
 
<!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
<link href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0-rc.1/css/select2.min.css" rel="stylesheet" />
 
<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="/static/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0-rc.1/js/select2.min.js"></script>

<select id="user_list" name="user_list" style="width:30%" >
    <option value="">请选择系统-------</option>
 </select>

<script>
$('#user_list').select2({
    minimumInputLength: 3,
    ajax:
        {
            url: "/deviceman/ajax_get_user_list",
            dataType: 'json',
            type: 'GET',
            delay: 250,
            data: function (params) {
            return {
            search: params.term,
                    }
                                    },
 
            processResults: function (data) {
            return {
            results: data
                    };
                                            },
 
            cache: true
        },
 
});
 
</script>

def ajax_get_user_list(request):
    """
    AJAX数据源视图-系统模块
    """
    start = int(request.GET.get('iDisplayStart', '0'))
    length = int(request.GET.get('iDisplayLength', '30'))
    search = request.GET.get('search', '')
    current_office=request.session.get('officename')
    #取得前台控件输入的关键字
    if search:
    #截取查询结果对象，以start开始截取start+length位
        orgs = user_list.objects.filter(   (Q(full_name__icontains=search) | Q ( email_address__icontains=search))&Q(dept_list__dept_name__icontains=current_office)).values('id').annotate(text=F('full_name')).exclude(user_status='inactive')
    else:
        orgs = user_list.objects.all().values('id').annotate(text=F('full_name'))
 
    # val_list = []
    # for org in orgs:
    #     val_list.append({'id': org.id, 'text': org.full_name})
    #     #根据关键字查询得到结果后开始拼装返回到前台的数据。先生成字典型数组，一般SELECT2组件使用的话生成id、text两个字段即可
    ret=list(orgs)
    result = json.dumps(ret)
    return HttpResponse(result)