Knockout.js和复选框列表:发布到mvc控制器

Question

我有一个MVC视图模型,如下所示:

public class DirectorySearchModel
{
    [Display(Name = "First name contains")]
    public string FirstName { get; set; }

    [Display(Name = "Last name contains")]
    public string LastName { get; set; }

    public CountriesCollection Countries { get; set; }
    public IEnumerable<Country> SelectedCountries { get; set; }
    public IEnumerable<Country> AllCountries { get; set; }
}

CountriesCollection对象(第9行)如下所示:

public class CountriesCollection
{
    [Display(Name = "Countries")]
    public int[] arrCountries { get; set; }
}

现在,我正在创建一个新的,空白的CountriesCollection实例,然后将其添加到DirectorySearchModel视图模型的空白实例中,然后将其全部序列化为Knockout.js的javascript视图模型:

{
"FirstName":null,

"LastName":null,

"Countries":{"arrCountries":[]},

"SelectedCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}],

"AllCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}]
}

我的复选框呈现为:<input checked="checked" data-bind="checked: Countries.arrCountries" id="Countries_arrCountries30" name="Countries.arrCountries" type="checkbox" value="1">.检查一对夫妇意味着你最终得到这个Knockout.js视图模型:

{
"FirstName":null,

"LastName":null,

"Countries":{"arrCountries":["1", "3"]},

"SelectedCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}],

"AllCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},{"RelationshipManager":{},"CountryId":3,"CountryName":"Spain"}]
}

正常提交我的视图(即通过提交按钮,而不是Knockout.js)提交给期望的MVC动作DirectorySearchModel,我可以要求model.Countries.arrCountries获取已检查项目的列表,但是当我使用时......

$.post("/MyController/MyAction", ko.toJS(viewModel), function(returnData) {
    $("#resultCount").html(returnData);
});

要么...

$.post("/MyController/MyAction", viewModel, function(returnData) {
    $("#resultCount").html(returnData);
});

给需要同另一个动作DirectorySearchModel, model.Countries.arrCountries是永远null!我想知道是否由于Knockout.js 在MVC期待s时将arrCountries条目发布为string[]s int[],但是将我的MVC代码更改为期望string[]s似乎没有太大改变......!内部的CountriesCollection对象DirectorySearchModel似乎存在,但它arrCountries始终存在于内部null.

有任何想法吗？任何帮助非常感谢!

编辑

接收Knockout.js viewModel的操作:

public MvcHtmlString ResultCount(DirectorySearchModel model)
{
    return new MvcHtmlString(getResultCount(model).ToString());
}

该getResultCount方法:

public int getResultCount(DirectorySearchModel model)
{
    IUserRepository userRepository = new UserRepository();
    int count = userRepository.Search(model, null).Count();
    return count;
}

固定!

感谢Konstantin指出从$ .post到$ .ajax的简单切换将我的Knockout.js视图模型发送回我的mvc动作就是所有需要的!这是我正在使用的$ .ajax代码:

$.ajax({  
    type: "POST",
    url: "/MyController/MyAction",
    data: ko.toJSON(viewModel),
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (data) {
        $("#resultCount").html(data);
    }
});

Answer 1

您不能使用 $.post 您需要寻找底层 $.ajax 并添加正确的 contenttype 以使 mvc 接受发布的 json 并执行模型绑定（contenttype 应该是“application/json; charset=utf-8”）google对于它，你会看到很多例子