24

我正在尝试创建一个使用 ng-grid 和 ASP.NET WebAPI 的简单工作示例。因此,我从 ng-grid 示例页面 ( http://angular-ui.github.io/ng-grid/ ) 中的服务器端分页示例开始;无论如何,我的网格总是显示空列,即使在调试时我可以确认数据已正确接收。可能我只是在网格设置中遗漏了一些东西,但我发现的所有样本看起来都与我的相似。有人可以帮忙吗?这是我所做的:

更新#1:建议的解决方案似乎有效,但仅适用于第一页。每当我移动到新页面或执行任何其他需要刷新的操作时,即使服务器按预期返回数据更改,显示的数据也会保持不变。此外,从我发现的所有代码示例中,似乎设置数据的正确方法只是替换数组成员值,而不是清空并再次填充它。我按照https://groups.google.com/forum/#!searchin/angular/nggrid/angular/vUIfHWt4s_4/oU_C9w8j-uMJ中的建议尝试了 apply ,但得到了相同的结果。


服务器端

只需创建一个新的 MVC4 应用程序,更新 NuGet 包并添加 angular 和 ng-grid 包。我的假数据模型由 Item 类表示:

public sealed class Item
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public bool IsFemale { get; set; }
}

我还添加了几个模型来处理分页、过滤和排序各种数据集(我发现更容易拥有一个通用的分页基础模型 -PagedFilter- 和一些派生模型):

public class PagedFilter
{
    private int _nPageSize;
    private int _nPageNumber;

    public int PageSize
    {
        get { return _nPageSize; }
        set
        {
            if (value < 1) throw new ArgumentOutOfRangeException("value");
            _nPageSize = value;
        }
    }

    public int PageNumber
    {
        get { return _nPageNumber; }
        set
        {
            if (value < 1) throw new ArgumentOutOfRangeException("value");
            _nPageNumber = value;
        }
    }

    public int TotalItems { get; set; }

    public int TotalPages
    {
        get { return (int)Math.Ceiling((double)(TotalItems / PageSize)); }
    }

    public PagedFilter()
    {
        _nPageSize = 20;
        _nPageNumber = 1;
    }
}

这是项目过滤器:

public class ItemFilter : PagedFilter
{
    public List<string> SortFields { get; set; }
    public List<string> SortDirections { get; set; }
    public string Name { get; set; }
    public int? MinAge { get; set; }
    public int? MaxAge { get; set; }
}

然后我添加一个用于获取项目的 API 控制器:

public class ItemController : ApiController
{
    // fake data
    private readonly List<Item> _items;

    public ItemController()
    {
        Random rnd = new Random();
        _items = new List<Item>();
        char c = 'a';

        for (int i = 0; i < 1000; i++)
        {
            _items.Add(new Item
                            {
                                Id = i,
                                Age = rnd.Next(1, 100),
                                IsFemale = ((i & 1) == 0),
                                Name = String.Format(CultureInfo.InvariantCulture, "{0:00000}-{1}",
                                    i, new string(c, 5))
                            });
            if (++c > 'z') c = 'a';
        }
    }

    public dynamic Get([FromUri] ItemFilter filter)
    {
        var items = _items.AsQueryable();

        // filtering
        if (!String.IsNullOrEmpty(filter.Name))
            items = items.Where(i => i.Name.Contains(filter.Name));

        if (filter.MinAge.HasValue)
            items = items.Where(i => i.Age >= filter.MinAge.Value);

        if (filter.MaxAge.HasValue)
            items = items.Where(i => i.Age <= filter.MaxAge.Value);

        // ...sorting (using Dynamic Linq) omitted for brevity...

        // paging
        int nTotalItems = items.Count();
        items = items.Skip((filter.PageNumber - 1) * filter.PageSize)
                     .Take(filter.PageSize);
        return new
                   {
                       totalItems = nTotalItems,
                       items = items.ToArray()
                   };
    }
}

客户端

在客户端,我的 Angular 应用程序只是在 ng-grid 示例上建模的单个控制器:因此我直接将属性添加到 $scope,即使在实际场景中我宁愿使用模型(可能从TypeScript 类)。HTML:

<div ng-app="MyApp" ng-controller="MainController">
    <div ng-grid="gridOptions" style="height: 400px">
    </div>
</div>

JS:

var app = angular.module('MyApp', ['ngGrid']);

app.controller('MainController', ['$scope', '$http', function ($scope, $http, $apply) {
    $scope.items = [];

    // filter
    $scope.filterOptions = {
        filterText: "",
        useExternalFilter: true
    };

    // paging
    $scope.totalServerItems = 0;
    $scope.pagingOptions = {
        pageSizes: [25, 50, 100],
        pageSize: 25,
        currentPage: 1
    };

    // sort
    $scope.sortOptions = {
        fields: ["name"],
        directions: ["ASC"]
    };

    // grid
    $scope.gridOptions = {
        data: "items",
        columnDefs: [
            { field: "name", displayName: "Name", pinnable: true },
            { field: "age", displayName: "Age", width: "60" },
            { field: "isFemale", displayName: "F", width: "40" }
        ],
        enablePaging: true,
        enablePinning: true,
        pagingOptions: $scope.pagingOptions,        
        filterOptions: $scope.filterOptions,
        keepLastSelected: true,
        multiSelect: false,
        showColumnMenu: true,
        showFilter: true,
        showGroupPanel: true,
        showFooter: true,
        sortInfo: $scope.sortOptions,
        totalServerItems: "totalServerItems",
        useExternalSorting: true,
        i18n: "en"
    };

    $scope.refresh = function() {
        setTimeout(function () {
            var p = {
                name: $scope.filterOptions.filterText,
                pageNumber: $scope.pagingOptions.currentPage,
                pageSize: $scope.pagingOptions.pageSize,
                sortFields: $scope.sortOptions.fields,
                sortDirections: $scope.sortOptions.directions
            };

            $http({
                url: "/api/item",
                method: "GET",
                params: p
            }).success(function(data, status, headers, config) {
                $scope.totalServerItems = data.totalItems;
                // SUGGESTION #1 -- empty and fill the array
                /* $scope.items.length = 0;
                angular.forEach(data.items, function (item) {
                   $scope.items.push(item);
                }); 
                */
                // https://groups.google.com/forum/#!searchin/angular/nggrid/angular/vUIfHWt4s_4/oU_C9w8j-uMJ
                $scope.$apply(function () { $scope.items = data.items; });
                if (!$scope.$$phase) {
                    $scope.$apply();
                }
            }).error(function(data, status, headers, config) {
                alert(JSON.stringify(data));
            });
        }, 100);
    };

    // watches
    $scope.$watch('pagingOptions', function (newVal, oldVal) {
        if (newVal !== oldVal && newVal.currentPage !== oldVal.currentPage) {
            $scope.refresh();
        }
    }, true);

    $scope.$watch('filterOptions', function (newVal, oldVal) {
        if (newVal !== oldVal) {
            $scope.refresh();
        }
    }, true);

    $scope.$watch('sortOptions', function (newVal, oldVal) {
        if (newVal !== oldVal) {
            $scope.refresh();
        }
    }, true);

    $scope.refresh();
}]);

在我的代码中,调用了成功回调,我可以浏览data.items中所有返回的项目。然而,网格中没有显示任何内容。控制台中没有出现错误。

4

6 回答 6

13

经过一番试验,我想我找到了正确的代码。这篇关于 $apply 的帖子对我有所帮助:http: //jimhoskins.com/2012/12/17/angularjs-and-apply.html。事实上,如果我理解得很好,那么根本不需要调用 apply ,因为我的数据来自 $http 已经提供了这个。所以,我只在成功回调中设置了范围项变量。这是完整的JS,希望这可以帮助像我这样的新手。现在,我将使用 TypeScript 模型、服务和所有现实世界的东西来扩展测试:我担心我将不得不发布一些新帖子...... :)

var app = angular.module('MyApp', ['ngGrid']);

app.controller('MainController', ['$scope', '$http', function ($scope, $http, $apply) {
    $scope.items = [];

    // filter
    $scope.filterOptions = {
        filterText: "",
        useExternalFilter: true
    };

    // paging
    $scope.totalServerItems = 0;
    $scope.pagingOptions = {
        pageSizes: [25, 50, 100],
        pageSize: 25,
        currentPage: 1
    };

    // sort
    $scope.sortOptions = {
        fields: ["name"],
        directions: ["ASC"]
    };

    // grid
    $scope.gridOptions = {
        data: "items",
        columnDefs: [
            { field: "id", displayName: "ID", width: "60" },
            { field: "name", displayName: "Name", pinnable: true },
            { field: "age", displayName: "Age", width: "60" },
            { field: "isFemale", displayName: "F", width: "40" }
        ],
        enablePaging: true,
        enablePinning: true,
        pagingOptions: $scope.pagingOptions,        
        filterOptions: $scope.filterOptions,
        keepLastSelected: true,
        multiSelect: false,
        showColumnMenu: true,
        showFilter: true,
        showGroupPanel: true,
        showFooter: true,
        sortInfo: $scope.sortOptions,
        totalServerItems: "totalServerItems",
        useExternalSorting: true,
        i18n: "en"
    };

    $scope.refresh = function() {
        setTimeout(function () {
            var sb = [];
            for (var i = 0; i < $scope.sortOptions.fields.length; i++) {
                sb.push($scope.sortOptions.directions[i] === "DESC" ? "-" : "+");
                sb.push($scope.sortOptions.fields[i]);
            }

            var p = {
                name: $scope.filterOptions.filterText,
                pageNumber: $scope.pagingOptions.currentPage,
                pageSize: $scope.pagingOptions.pageSize,
                sortInfo: sb.join("")
            };

            $http({
                url: "/api/item",
                method: "GET",
                params: p
            }).success(function(data, status, headers, config) {
                $scope.totalServerItems = data.totalItems;
                $scope.items = data.items;
            }).error(function(data, status, headers, config) {
                alert(JSON.stringify(data));
            });
        }, 100);
    };

    // watches
    $scope.$watch('pagingOptions', function (newVal, oldVal) {
        if (newVal !== oldVal) {
            $scope.refresh();
        }
    }, true);

    $scope.$watch('filterOptions', function (newVal, oldVal) {
        if (newVal !== oldVal) {
            $scope.refresh();
        }
    }, true);

    $scope.$watch('sortOptions', function (newVal, oldVal) {
        if (newVal !== oldVal) {
            $scope.refresh();
        }
    }, true);

    $scope.refresh();
}]);

(作为旁注,您可以从代码中看到我传递一个字符串来排序数据,而不是两个数组来传递字段和方向。事实上,我找不到接收数组作为输入成员的正确方法模型在 C# 控制器中;所以我只是传递一个字符串,其中每个字段名称都以 + 或 - 为前缀,根据升/降方向)。

于 2013-07-23T11:39:31.750 回答
4

您正在将 ng-grid 上的数据源设置为,items但是您永远不会在服务器成功回调上更新 items 数组。

在成功回调做这样的事情

$scope.totalServerItems = data.totalItems;
angular.forEach(data.items, function(item) {
   $scope.items.push(item);
});
于 2013-07-22T12:16:42.793 回答
1

它也可能有帮助

HTML 代码示例

<html ng-app="myApp">  
    <head lang="en">
        <meta charset="utf-8">
        <title>Getting Started With ngGrid code-sample</title>  
        <script type="text/javascript" src="angular.js"></script>
        <script type="text/javascript" src="ng-grid-1.3.2.js"></script>
    </head>
    <body ng-controller="MyCtrl">
        <div class="gridStyle" ng-grid="gridOptions"></div>
    </body>
</html>

AngulaJs 代码示例

var app = angular.module('myApp', ['ngGrid']);
app.controller('MyCtrl', function($scope, $http) {
    $scope.filterOptions = {
        filterText: "",
        useExternalFilter: true
    }; 
    $scope.totalServerItems = 0;
    $scope.pagingOptions = {
        pageSizes: [250, 500, 1000],
        pageSize: 250,
        currentPage: 1
    };  
    $scope.setPagingData = function(data, page, pageSize){  
        var pagedData = data.slice((page - 1) * pageSize, page * pageSize);
        $scope.myData = pagedData;
        $scope.totalServerItems = data.length;
        if (!$scope.$$phase) {
            $scope.$apply();
        }
    };
    $scope.getPagedDataAsync = function (pageSize, page, searchText) {
        setTimeout(function () {
            var data;
            if (searchText) {
                var ft = searchText.toLowerCase();
                $http.get('jsonFiles/largeLoad.json').success(function (largeLoad) {        
                    data = largeLoad.filter(function(item) {
                        return JSON.stringify(item).toLowerCase().indexOf(ft) != -1;
                    });
                    $scope.setPagingData(data,page,pageSize);
                });            
            } else {
                $http.get('jsonFiles/largeLoad.json').success(function (largeLoad) {
                    $scope.setPagingData(largeLoad,page,pageSize);
                });
            }
        }, 100);
    };

    $scope.getPagedDataAsync($scope.pagingOptions.pageSize, $scope.pagingOptions.currentPage);

    $scope.$watch('pagingOptions', function (newVal, oldVal) {
        if (newVal !== oldVal && newVal.currentPage !== oldVal.currentPage) {
          $scope.getPagedDataAsync($scope.pagingOptions.pageSize, $scope.pagingOptions.currentPage, $scope.filterOptions.filterText);
        }
    }, true);
    $scope.$watch('filterOptions', function (newVal, oldVal) {
        if (newVal !== oldVal) {
          $scope.getPagedDataAsync($scope.pagingOptions.pageSize, $scope.pagingOptions.currentPage, $scope.filterOptions.filterText);
        }
    }, true);

    $scope.gridOptions = {
        data: 'myData',
        enablePaging: true,
        showFooter: true,
        totalServerItems: 'totalServerItems',
        pagingOptions: $scope.pagingOptions,
        filterOptions: $scope.filterOptions
    };
});
于 2014-12-24T09:49:18.893 回答
0

我最近一直在使用 ng-grid。我在引用新版本的 AngularJS 时遇到了类似的问题。确保您引用 angular min 文件 1.0.2。

这是我的带有分页的 ng-grid 的客户端代码。一旦实现了正确版本的 Angular JS,它就可以完美运行。

var app = angular.module('myApp', ['ngGrid']);

app.controller('MyCtrl', function ($scope, $http) {
// We needed to bring back mer becase we were using a variable that was being reassigned later on
var mer = [{ Item: "Bottle", Pcode: 50, OHQ: 333, AQ: 33, Details: "CLICK" },
    { Item: "Bottle", Pcode: 43, OHQ: 2350, AQ: 1250, Details: "CLICK" },
    { Item: "Bottle", Pcode: 27, OHQ: 4000, AQ: 3000, Details: "CLICK" },
    { Item: "Bottle", Pcode: 29, OHQ: 55, AQ: 10, Details: "CLICK" },
    { Item: "Bottle", Pcode: 34, OHQ: 27, AQ: 2, Details: "CLICK" },
    { Item: "Bottle", Pcode: 50, OHQ: 111, AQ: 33, Details: "CLICK" },
    { Item: "Bottle", Pcode: 43, OHQ: 123, AQ: 1250, Details: "CLICK" },
    { Item: "Bottle", Pcode: 27, OHQ: 1234, AQ: 3000, Details: "CLICK" },
    { Item: "Bottle", Pcode: 29, OHQ: 5678, AQ: 10, Details: "CLICK" },
    { Item: "Bottle", Pcode: 34, OHQ: 0, AQ: 2, Details: "CLICK" }];


$scope.filterOptions = {
    filterText: "",
    useExternalFilter: false
};
$scope.totalServerItems = 0;
$scope.pagingOptions = {
    pageSizes: [5, 10],
    pageSize: 5,
    currentPage: 1
};

$scope.setPagingData = function (data, page, pageSize) {
    var pagedData = data.slice((page - 1) * pageSize, page * pageSize);
    $scope.myData = pagedData;
    $scope.totalServerItems = data.length;
    if (!$scope.$$phase) {
        $scope.$apply();
    }
};

// I rearranged some of the code in this function.  I noticed we were calling the same function
// in the end just with a slightly different set of data....so instead of having 18-ish lines of code
// we have 12 (YAY)
$scope.getPagedDataAsync = function (pageSize, page, searchText) {
    setTimeout(function () {
        var data = mer;
        if (searchText) {
            var ft = searchText.toLowerCase();
            data = mer.filter(function (item) {
                JSON.stringify(item).toLowerCase().indexOf(ft) != -1;
            });
        }
        $scope.setPagingData(data, page, pageSize);
    }, 100);
};

$scope.getPagedDataAsync($scope.pagingOptions.pageSize, $scope.pagingOptions.currentPage);

$scope.$watch('pagingOptions', function (newVal, oldVal) {
    // Got rid of the other check here...this is what was causing the filter to not change the data when it changed.
    if (newVal !== oldVal) {
        $scope.getPagedDataAsync($scope.pagingOptions.pageSize, $scope.pagingOptions.currentPage, $scope.filterOptions.filterText);
    }
}, true);

$scope.$watch('filterOptions', function (newVal, oldVal) {
    if (newVal !== oldVal) {
        $scope.getPagedDataAsync($scope.pagingOptions.pageSize, $scope.pagingOptions.currentPage, $scope.filterOptions.filterText);
    }
}, true);

$scope.gridOptions = {
    data: 'myData',
    enablePaging: true,
    showFooter: true,
    totalServerItems: 'totalServerItems',
    pagingOptions: $scope.pagingOptions,
    filterOptions: $scope.filterOptions
};

});

于 2013-12-12T18:47:36.403 回答
0

最后一个文档对这个问题非常明确:http: //ui-grid.info/docs/#/tutorial/308_external_filtering

我的结果代码:

var pagination = {
    pageNumber: 1,
    pageSize: 10,
    // list fields to be sorted
    sort: [{field:'dup_percentage', direction:'desc'}],
    // list fields to be filtered
    filter: []
};

$scope.gridOptions = {
    enableFiltering: true,
    useExternalFiltering: true,
    columnDefs: [...],
    onRegisterApi: function( gridApi ) {
        $scope.gridApi = gridApi;
        $scope.gridApi.core.on.filterChanged( $scope, function() 
        {
                var grid = this.grid;

                // reset filters
                pagination.filter = [];

                // loop over all columns
                angular.forEach(grid.columns, function(column, i)
                {
                    // loop over filters
                    if(typeof column.filters!==undefined)
                    {
                        angular.forEach(column.filters, function(filter, j)
                        {
                            // add column name and value to filter array
                            // to be send server side
                            if(typeof filter.term!=undefined && filter.term!==undefined)
                            {
                                //console.log('add filter', {column:column.name, search:filter.term});
                                pagination.filter.push({column:column.name, search:filter.term});
                            }
                        });
                    }
                });


                // when user types it's search term
                // server would be hitting too much 
                // so we add 500ms throttle
                if (angular.isDefined($scope.filterTimeout))
                {
                    $timeout.cancel($scope.filterTimeout);
                }
                $scope.filterTimeout = $timeout(function () 
                {
                    // use pagination var which contains all info
                    // needed server side
                    getPage();
                }, 500);
            });

好的,现在客户端完成了!你必须在服务器端处理它,我无法帮助你使用 .Net WebAPI,因为我是 PHP/Mysql 驱动......

于 2016-05-30T09:27:46.557 回答
-3

就像 Angular 网站上的示例一样:

$http({
            url: "/payments/GetPayments",
            method: "GET",
            params: p
        }).success(function(data, status, headers, config) {
            // Как в примере
            $scope.items = data.items;
            $scope.totalServerItems = data.totalItems;
            if (!$scope.$$phase) {
                $scope.$apply();
            }

        }).error(function(data, status, headers, config) {
                alert(JSON.stringify(data));
        });
于 2014-01-15T12:48:28.790 回答