我正在尝试使用 KnockoutJs KOGrid 进行分页。我一直在关注这个:http://knockout-contrib.github.io/KoGrid/#paging

我传递到我的 View 模型(vm 参数)的数据包含以下内容:

我的knockout View 模型如下:

function ViewModel(vm) {
    var self = this;
    this.myData = ko.observableArray([]);

    this.rows = ko.observableArray(vm.Rows);

    this.deleteInvisibleColumns = function () {
        for (var i = 0; i < vm.Rows.length; i++) {
            var row = vm.Rows[i];

            var keys = Object.keys(row);
            for (var k = 0; k < keys.length; k++) {
                if (vm.VisibleColumns.indexOf(keys[k]) === (-1)) {
                    delete row[keys[k]];
                };
            };
        };
    };  

    self.deleteInvisibleColumns();

    this.filterOptions = {
        filterText: ko.observable(""),
        useExternalFilter: true
    };

    this.pagingOptions = {
        pageSizes: ko.observableArray([2, 500, 1000]),
        pageSize: ko.observable(2),
        totalServerItems: ko.observable(0),
        currentPage: ko.observable(1)     
    };

    this.setPagingData = function(data, page, pageSize){    
        var pagedRows = data.Rows.slice((page - 1) * pageSize, page * pageSize);
        var pagedData = { Rows: pagedRows, VisibleColumns: data.VisibleColumns };

        self.myData(pagedData);
        self.pagingOptions.totalServerItems(data.Rows.length);
    };

    this.getPagedDataAsync = function (pageSize, page, searchText) {
        setTimeout(function () {
            var data;
            if (searchText) {
                var ft = searchText.toLowerCase();
                $.getJSON('/SampleData/GetDataPage', function (returnedPayload) {
                    data = returnedPayload.filter(function (item) {
                        return JSON.stringify(item).toLowerCase().indexOf(ft) != -1;
                    });
                    self.setPagingData(data,page,pageSize);
                });          
            } else {
                $.getJSON('/SampleData/GetDataPage', function (returnedPayload) {
                    self.setPagingData(returnedPayload, page, pageSize);
                });
            }
        }, 100);
    };

    self.filterOptions.filterText.subscribe(function (data) {
        self.getPagedDataAsync(self.pagingOptions.pageSize(), self.pagingOptions.currentPage(), self.filterOptions.filterText());
    });   

    self.pagingOptions.pageSizes.subscribe(function (data) {
        self.getPagedDataAsync(self.pagingOptions.pageSize(), self.pagingOptions.currentPage(), self.filterOptions.filterText());
    });
    self.pagingOptions.pageSize.subscribe(function (data) {
        self.getPagedDataAsync(self.pagingOptions.pageSize(), self.pagingOptions.currentPage(), self.filterOptions.filterText());
    });
    self.pagingOptions.totalServerItems.subscribe(function (data) {
        self.getPagedDataAsync(self.pagingOptions.pageSize(), self.pagingOptions.currentPage(), self.filterOptions.filterText());
    });
    self.pagingOptions.currentPage.subscribe(function (data) {
        self.getPagedDataAsync(self.pagingOptions.pageSize(), self.pagingOptions.currentPage(), self.filterOptions.filterText());
    });

    self.getPagedDataAsync(self.pagingOptions.pageSize(), self.pagingOptions.currentPage());

    this.gridOptions = {
        data: self.myData,
        enablePaging: true,
        pagingOptions: self.pagingOptions,
        filterOptions: self.filterOptions
    };  
};

Andy 我的 html(Asp.Net MVC Razor View )是:

@model ESB.BamPortal.Website.Models.SampleDataViewModel
@using System.Web.Script.Serialization
@{
    ViewBag.Title = "Sample Data";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>@ViewBag.Title</h2>
@{  string data = new JavaScriptSerializer().Serialize(Model); }

<div id="Knockout" data-bind="koGrid: gridOptions">
</div>



@section Scripts {
    <script src="~/KnockoutVM/SampleData.js"></script>
    <link rel="stylesheet" type="text/css" href="~/Content/KoGrid.css">
    <script type="text/javascript">
        var vm = new ViewModel(@Html.Raw(data));
        ko.applyBindings(vm, document.getElementById("Knockout"));
    </script>
}

当页面加载时，从 kogrid.js 中抛出以下错误 Uncaught TypeError: grid.sortedData.peek(...).filter is not a function

self.evalFilter = function () {
        if (searchConditions.length === 0) {
            grid.filteredData(grid.sortedData.peek().filter(function(item) {

如果我检查 grid 对象的 sortedData 属性，它看起来没问题:

要执行的我的 knockout viewmodel js 的最后一行是 self.myData(pagedData); 在 this.SetPagingData 函数中。

我使用 Fiddler 从服务器的响应中提取了以下内容:

<script type="text/javascript">
        var vm = new ViewModel({"Rows":[{"SampleDataId":1,"Manufacturer":"Ford","Model":"Escort","Style":"Hatch"},{"SampleDataId":2,"Manufacturer":"Vauxhall","Model":"Cavalier","Style":"Saloon"},{"SampleDataId":3,"Manufacturer":"Rover","Model":"Montego","Style":"Saloon"},{"SampleDataId":4,"Manufacturer":"Ford","Model":"Escort","Style":"Hatch"},{"SampleDataId":5,"Manufacturer":"Vauxhall","Model":"Cavalier","Style":"Saloon"},{"SampleDataId":6,"Manufacturer":"Rover","Model":"Montego","Style":"Saloon"},{"SampleDataId":7,"Manufacturer":"Opel","Model":"Monza","Style":"Coupe"},{"SampleDataId":8,"Manufacturer":"BMW","Model":"325i","Style":"Saloon"},{"SampleDataId":9,"Manufacturer":"Ford","Model":"Escort","Style":"Hatch"},{"SampleDataId":10,"Manufacturer":"Vauxhall","Model":"Cavalier","Style":"Saloon"},{"SampleDataId":11,"Manufacturer":"Rover","Model":"Montego","Style":"Saloon"},{"SampleDataId":12,"Manufacturer":"Opel","Model":"Monza","Style":"Coupe"},{"SampleDataId":13,"Manufacturer":"BMW","Model":"325i","Style":"Saloon"},{"SampleDataId":14,"Manufacturer":"Ford","Model":"Escort","Style":"Hatch"},{"SampleDataId":15,"Manufacturer":"Vauxhall","Model":"Cavalier","Style":"Saloon"},{"SampleDataId":16,"Manufacturer":"Rover","Model":"Montego","Style":"Saloon"},{"SampleDataId":17,"Manufacturer":"Opel","Model":"Monza","Style":"Coupe"},{"SampleDataId":18,"Manufacturer":"BMW","Model":"325i","Style":"Saloon"},{"SampleDataId":19,"Manufacturer":"Ford","Model":"Escort","Style":"Hatch"},{"SampleDataId":20,"Manufacturer":"Vauxhall","Model":"Cavalier","Style":"Saloon"},{"SampleDataId":21,"Manufacturer":"Rover","Model":"Montego","Style":"Saloon"},{"SampleDataId":22,"Manufacturer":"Opel","Model":"Monza","Style":"Coupe"},{"SampleDataId":23,"Manufacturer":"BMW","Model":"325i","Style":"Saloon"}],"VisibleColumns":[]});
        ko.applyBindings(vm, document.getElementById("Knockout"));
    </script>

我哪里出错了？

最佳答案

您正确地将 ko.observableArray 属性 (myData) 指定为 gridOptions 对象的 data 参数，但是您必须确保它始终包含一个 JavaScript 数组。

Knockout 不会对您放入 ko.observableArray 中的内容进行“类型检查”，因此您需要确保始终使用数组。

但是在您的 setPagingData 中，您尝试将一个对象分配给您的 myData 而不是 array，这会引发此错误:

Uncaught TypeError: grid.sortedData.peek(...).filter is not a function

因为普通的 JavaScript 对象 litaral 没有 filter 函数。

修复非常简单，您只需将 pagedData.Rows 作为 myData 的值传递即可:

this.setPagingData = function(data, page, pageSize){    
        var pagedRows = data.Rows.slice((page - 1) * pageSize, page * pageSize);
        var pagedData = { Rows: pagedRows, VisibleColumns: data.VisibleColumns };

        self.myData(pagedData.Rows);
        self.pagingOptions.totalServerItems(data.Rows.length);
    };

旁注:您当前的实现没有进行适当的服务器端分页。因为您没有向服务器传递任何参数，而是在客户端处理返回的数据。

关于javascript - 未捕获的类型错误 : grid. sortedData.peek(...).filter 不是函数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35850798/