基于用户角色的 MVC 5 & Jquery DataTables 列显示

Question

在 MVC 5 项目中使用 Jquery 数据表。还使用 Datatables.MVC5 帮助器，这使整个任务变得更容易，并遵循 this tutorial 帮助将其全部设置为 MVC 服务器端处理。

我正在尝试显示按钮列，即编辑 |删除 |作为基于用户角色的前两列。这些按钮将调用我的普通 MVC 控制器。

我可以创建按钮，但我不知道如何处理角色检查。我以前的客户端使用 Razor 语法很容易，而现在使用 DataTables 变得更加棘手。

我的当前表。

        $(function () {
        assetListVM = {
            dt: null,
            init: function () {
                dt = $('#assetdatatable').DataTable({
                    "serverSide": true,
                    "processing": true,
                    "DisplayLength": 25,
                    "ajax": {
                        "type": "POST", // Required to change from 'GET' as this produced server error query string length too long.
                        "url": "@Url.Action("Get","Demo")",
                        "data": // Allows us to return extra data object to controller
                            function (d) {
                                d.excelExport = $("#excelExport").val();
                            }
                    },
                    "scrollY": viewheight, // Calculated to help ensure table is fitting max area of screen with out dropping off screen.
                    "colReorder": true,
                    "select": true,
                    "stateSave": true,
                    "dom": 'fBrtip',
                    "lengthMenu": [[25, 50, 100, 200, -1], [25, 50, 100, 200, "All"]],
                    "buttons": [
                        "pageLength",
                        "copy",
                        "excel"
                        ],
                    "columns": [
// HERE I need to check user Role and choose if to display column or not.
// I have tried Razor @if (User.IsInRole("Sausage")) { }
                        {
                            "title": "button column"
                            "data": "AssetID",
                            "className": 'details_button',
                            "render": function (AssetID)
                            {
                                return '<a class="btn-xs btn-primary glyphicon glyphicon-list-alt" href=/Demo/Details/' + AssetID +'></a>';
                                }
                            },
                        { "title": "AssetID", "data": "AssetID" },
                        { "title": "SIM", "data": "SIM" },
                        { "title": "IMEI", "data": "IMEI" },
                        { "title": "Software", "data": "LoggedOnSoftware" },
                        { "title": "Soft No", "data": "LoggedOnSoftwareVerNo" },
                        { "title": "Last Reset", "data": "LastResetType" },
                        {
                            "title": "Last Log", "data": "LastLogOnTime",
                            "render": function (LastLogOnTime) {
                                return (moment(LastLogOnTime).isValid()) ? moment(LastLogOnTime).format("DD MMM YY") : "-";
                            }
                        }
                    ],
                    "order": [[2, 'asc']]
                });
            }
        }

        // initialize the datatables
        assetListVM.init();
    });

在标题为按钮列的列中，我尝试了 Razor 语法，但与我之前的虚拟项目表不同，这些表都是基于 html 的。我可以发送一个具有当前用户角色的 viewbag 对象进行查看，然后对其进行检查，我只是不知道如何在表设置中执行 if/else 决定。

如果有人有任何类似的例子，我可以掌握或指出正确的方向，将不胜感激。

我已经搜索并检查了我找到的最接近的问题是this old one。

更新： 感谢杰米

这是我的新工作代码，基于当前用户角色将隐藏第一列。

var RoleCheck = @(User.IsInRole("sausage") ? "true" : "false"); // new check for user role outside of Jquery DataTable function which will work.
            $(function () {
        assetListVM = {
            dt: null,
            init: function () {
                dt = $('#assetdatatable').DataTable({
                    "serverSide": true,
                    "processing": true,
                    "ajax": {
                        "type": "POST", // Required to change from 'GET' as this produced server error query string length too long.
                        "url": "@Url.Action("Get","Demo")",
                        "data": // Allows us to return extra data object to controller
                            function (d) {
                                d.excelExport = $("#excelExport").val();
                            }
                    },
                    "columnDefs": [
                        {
                        "target": [0],
                        "visible": RoleCheck // new variable true or false based on user role.
                        }
                    ]
                    "columns": [
                        {
                            "title": "button column"
                            "data": "AssetID",
                            "className": 'details_button',
                            "render": function (AssetID)
                            {
                                return '<a class="btn-xs btn-primary glyphicon glyphicon-list-alt" href=/Demo/Details/' + AssetID +'></a>';
                                }
                            },
                        { "title": "AssetID", "data": "AssetID" },
                        { "title": "SIM", "data": "SIM" },
                        { "title": "IMEI", "data": "IMEI" },
                        { "title": "Software", "data": "LoggedOnSoftware" },
                        { "title": "Soft No", "data": "LoggedOnSoftwareVerNo" },
                        { "title": "Last Reset", "data": "LastResetType" },
                        {
                            "title": "Last Log", "data": "LastLogOnTime",
                            "render": function (LastLogOnTime) {
                                return (moment(LastLogOnTime).isValid()) ? moment(LastLogOnTime).format("DD MMM YY") : "-";
                            }
                        }
                    ],
                    "order": [[2, 'asc']]
                });
            }
        }
        // initialize the datatables
        assetListVM.init();
    });

Answer 1

您也许可以为该列添加 columnDef 并在那里设置可见性。

"columnDefs": [
        {
            "targets": [ 0 ], //first column
            "visible": @(User.IsInRole("Sausage") ? "true" : "false") // had syntactical error extra colon was there before question mark.
        }
    ]

设置变量而不是使用内联 Razor 代码。

var RoleCheck = @(User.IsInRole("Sausage") ? "true" : "false");


"columnDefs": [
        {
            "targets": [ 0 ], //first column
            "visible": RoleCheck 
        }
    ]

https://datatables.net/examples/basic_init/hidden_columns.html