如何在knockoutjs中使用嵌套viewmodels进行动态增删改查

How to perform dynamic add, delete and save with nested viewmodels in knockoutjs

在 MVC 中,您可以拥有以下视图模型:

public class MyCVViewModel
{
    [Required]
    [StringLength(100, ErrorMessage = "Resume Title cannot exceed 100 characters.")]
    [Display(Name = "Resume Title")]
    public string ResumeTitle { get; set; }
    [Required]
    [StringLength(1000, ErrorMessage = "Personal Statment cannot exceed 1000 characters.")]
    [Display(Name = "Personal Statement")]
    public string Statement { get; set; }

    public List<MyCompanyViewModel> Companies { get; set; }
}

public class MyCompanyViewModel
{
    [Required]
    [StringLength(100, ErrorMessage = "Company Name cannot exceed 100 characters.")]
    [Display(Name = "Company Name")]
    public string CompanyName { get; set; }
    [Required]
    [StringLength(100, ErrorMessage = "Job Title cannot exceed 100 characters.")]
    [Display(Name = "Job Title")]
    public string JobTitle { get; set; }
    [Required]
    [DataType(DataType.Date)]
    [Display(Name = "Start Date")]
    public DateTime JobStartDate { get; set; }
    [Required]
    [DataType(DataType.Date)]
    [Display(Name = "End Date")]
    public DateTime JobEndDate { get; set; }
    [Required]
    [StringLength(1000, ErrorMessage = "Job Description cannot exceed 1000 characters.")]
    [Display(Name = "Job Description")]
    public string JobDescription { get; set; }
}

MyCVViewModel 有一个 MyCompanyViewModels 列表,这非常简单。

我开始学习 knockoutjs 并尝试在 knockoutjs 中复制相同的视图模型。

这是我到目前为止尝试过的方法:

//company viewmodel
function Company(data) {
    this.name = ko.observable(data.name);
    //other stuff
}

//cv view model
function CVViewModel() {
    var self = this;

    self.title = ko.oberservable();
    self.statement = ko.oberservalbe();
    //list of company view model
    self.companies = ko.observableArray();

    //add company
    self.addCompany = function () {
        self.companies.push({
            name: ""
        });
    };

    //remove company
    self.removeCompany = function (company) {
        self.companies.remove(company);
    };

    //populate with json
    $.getJSON("/Class/FillCompany", function (allData) {
        var mappedTasks = $.map(allData, function (item) { return new Company(item) });
        self.companies(mappedTasks);
    });
};

// Activate knockout binding
ko.applyBindings(new CVViewModel());

添加和删除工作正常,但我不确定如何将整个 cv viewmodel 和 post 保存到 asp.net mvc 中的控制器。

大多数在线教程 post 子视图模型(在我的公司列表中)和 post 它到服务器而不是父视图模型(在我的示例中是 cvviewmdoel)。

所以在我看来我只能post服务器的公司:

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    <textarea name="companies" data-bind="value: ko.toJSON(companies)"></textarea>
    <button type="submit">Save</button>
}

在我的控制器中,我希望有一个公司列表:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Index([FromJson] IEnumerable<Company> companies)
{
    //save to database etc..
}

如何 post 整个父视图模型,以便我的控制器看起来更像:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Index(MyCVViewModel cv)
{
    //save to database etc..
}

其中 MyCVViewModel 已包含公司列表。

只需在客户端上进行一些编程,您就可以完成这项工作。

首先,您可能想为自己节省一些时间,除非您需要与每家公司进行一些使用 ko.mapping

无法通过订阅者处理的事情
ko.mapping.fromJS(allData, {} self.companies)

此外,在添加新公司时,您需要保持其可观察性,因此请使用:

self.companies.push(new Company(name));

您可以将整个模型 header 和 children 作为 json object 发送以匹配您的服务器端 object.

因此将您的视图模型更改为以下内容:

function viewModel()
{
   var self = this;

   self.title = ko.oberservable();
   self.statement = ko.oberservalbe();
   //list of company view model
   self.companies = ko.observableArray();

   //add company
   self.addCompany = function () {
      self.companies.push(new Company(name));
   };

   //remove company
   self.removeCompany = function (company) {
       self.companies.remove(company);
   };

   //populate with json
   $.getJSON("/Class/FillCompany", function (allData) {
       ko.mapping.fromJS(allData, {} self.companies)
   });

   //save
   saveModel = function(){
        var data = ko.mapping.toJS(self);
        $ajax({
        url: 'Class/SaveCompany',
        type: 'POST',
        contentType: 'application/json',
        dataType: 'json',
        data: data,
        success: function (data, textStatus, jqXhr) {
           //do success stuff here.
        }

   }

然后在您提交时,将您的点击事件绑定到视图模型保存事件,它会发送一个 parent 模型,其中所有 children 作为单个表单 post。

希望对您有所帮助。