带有 mvc 集合模型绑定的 knockoutjs

Question

我正在使用 knockoutjs 来呈现项目集合。在允许用户进行一些内联​​编辑后，我需要将集合发布回服务器。但是，该集合没有在服务器上填充，因为我没有使用 name="[0].Blah" 命名约定。有谁知道如何使用 knockoutjs 呈现这样的名称属性，或者如何创建一个模型绑定器以允许我从 ValueProvider 中提取值？

下面可以看到ValueProvider在调试过程中的截图。

http://i.imgur.com/zSU5Z.png

这是我的托管 ViewModel：

public class FundLevelInvestmentUploadResult
{
    public string FileName { get; set; }
    public IList<FundLevelInvestmentViewModel> Items { get; set; }
    public int NumberOfErrors { get; set; }

    public bool ShowErrorsOnly { get; set; }

    public FundLevelInvestmentUploadResult()
    {
        Items = new List<FundLevelInvestmentViewModel>();
    }
}

这是“Items”的托管类：

public class FundLevelInvestmentViewModel
{
    private string _fund;
    private string _fundType;
    private string _date;
    private string _netOfWaivedFees;
    private string _waivedFees;
    private string _bcip;
    private string _fxRate;

    public uint RowIndex { get; set; }

    public int? DealCode { get; set; }
    public bool DealCodeIsValid { get; set; }

    public string Fund
    {
        get { return _fund; }
        set { _fund = GetString(value); }
    }
    public bool FundIsValid { get; set; }

    public string FundType
    {
        get { return _fundType; }
        set { _fundType = GetString(value); }
    }
    public bool FundTypeIsValid { get; set; }

    public string DateOfInvestment
    {
        get { return _date; }
        set { _date = GetString(value); }
    }
    public bool DateOfInvestmentIsValid { get; set; }

    public string NetOfWaivedFees
    {
        get { return _netOfWaivedFees; }
        set { _netOfWaivedFees = GetString(value); }
    }
    public bool NetOfWaivedFeesIsValid { get; set; }

    public string WaivedFee
    {
        get { return _waivedFees; }
        set { _waivedFees = GetString(value); }
    }
    public bool WaivedFeeIsValid { get; set; }

    public string BCIP
    {
        get { return _bcip; }
        set { _bcip = GetString(value); }
    }
    public bool BCIPIsValid { get; set; }

    public string ExchangeRateToUSD
    {
        get { return _fxRate; }
        set { _fxRate = GetString(value); }
    }
    public bool ExchangeRateToUSDIsValid { get; set; }

    public string FileName { get; set; }

    private IList<string> _errors;
    public IList<string> Errors
    {
        get { return _errors ?? (_errors = new List<string>());}
        set { _errors = value; }
    }

    public bool Show { get; set; }

    public FundLevelInvestmentViewModel()
    {
        Errors = new List<string>();
        Show = true;
    }

    // knockoutjs is returning "null" instead of "" for a null object when calling ko.mapping.fromJS
    private string GetString(string value)
    {
        if (value == "null")
            return string.Empty;

        return value;
    }
}

这是我的淘汰视图模型：

var viewModel = {
    FileData: ko.observableArray([]),

    validateFile: function (file, event) {
        $.ajax({
            type: 'post',
            url: newUrl,
            data: ko.mapping.toJS(file)
        }).done(function (data) {
            var newFile = ko.mapping.fromJS(data);
            var index = file.Items.indexOf(file);
            viewModel.FileData.replace(file, newFile);
        });
    }
};

Answer 1

如果您使用的是 2.1.0.0 或更高版本的淘汰赛，您可以从可观察数组中呈现 name 属性，如下所示。

<input data-bind='attr: { name: "Items["+$index()+"].DealCode"}' />