带有BeginCollectionItem的MVC 5动态行

Question

单击按钮时向表中添加/删除行的最佳方法是什么？我需要从ChildClass属性创建的行(子类是主类/模型中的列表).

目前有一个View(模型是MyMain),它使用RenderPartial引用一个局部视图.

局部视图显示模型的属性,一个名为MyChild的类,它是MyMain中的对象列表.

我想添加和删除按钮来动态添加部分视图中保存的行.

因此,重复添加MyChild以获取列表中的更多行.这可能吗？或者我不应该为此使用部分视图？

更新的代码

下面是我正在使用的当前类和视图,我一直在尝试实现BeginCollectionItem帮助器,但我得到null ref,我试图加载局部视图,尽管if语句说创建一个新实例子类如果不存在 - 为什么会被忽略？

主视图

    @using (Html.BeginForm())
{
    <table>
        <tr>
            <th>MyMain First</th>
            <th>MyChild First</th>
        </tr>
        <tr>
            <td>
                @Html.EditorFor(m => m.First)
            </td>
            <td>
                @if (Model.child != null)
                {
                    for (int i = 0; i < Model.child.Count; i++)
                    {
                        Html.RenderPartial("MyChildView");
                    }
                }        
                else
                {
                    Html.RenderPartial("MyChildView", new MvcTest.Models.MyChild());
                }       
            </td>
        </tr>
        @Html.ActionLink("Add another", "Add", null, new { id = "addItem" })
    </table>
}

局部视图

@model MvcTest.Models.MyChild

@using (Html.BeginCollectionItem("myChildren"))
{
    Html.EditorFor(m => m.Second);
}

楷模

public class MyMain
{
    [Key]
    public int Id { get; set; }
    public string First { get; set; }
    public List<MyChild> child { get; set; }
}

public class MyChild
{
    [Key]
    public int Id { get; set; }
    public string Second { get; set; }
}

调节器

public class MyMainsController : Controller
{
    // GET: MyMains
    public ActionResult MyMainView()
    {
        return View();
    }

    [HttpPost]
    public ActionResult MyMainView(IEnumerable<MyChild> myChildren)
    {
        return View("MyMainView", myChildren);
    }

    public ViewResult Add()
    {
        return View("MyChildView", new MyChild());
    }
}

Answer 1

更新的答案 -原来的代码是不是真实的"动态",但是它允许我需要这个问题的参数范围内所做的一切.

最初,我无法在评论工作的问题中得到斯蒂芬的BCI建议,因为那时我已经并且它很棒.如果您复制+粘贴,则更新部分中的以下代码将起作用,但您需要从GIT手动下载BCI或PM> Install-Package BeginCollectionItem在Visual Studio中使用Package Manager控制台.

由于复杂性以及之前没有使用过MVC,我在使用BCI的各个方面遇到了一些问题 - 这里有关于处理访问的更多信息class.property(type class).property(type class).property.

原始答案 - 我已经在下面提供了一个更清晰的例子,而不是我的问题,这很快就让人感到困惑.

使用两个部分视图,一个用于员工列表,另一个用于创建新员工,所有这些视图都包含在companyemployee的viewmodel中,其中包含公司对象和员工对象列表.这样,可以从列表中添加,编辑或删除多个员工.

希望这个答案可以帮助任何寻找类似东西的人,这应该提供足够的代码来使其工作,并至少推动你朝着正确的方向前进.

我已经省略了我的上下文和初始化类,因为它们只对代码优先,如果需要我可以添加它们.

感谢所有帮助过的人.

模型 - CompanyEmployee是视图模型

public class Company
{
    [Key]
    public int id { get; set; }
    [Required]
    public string name { get; set; }
}

public class Employee
{
    [Key]
    public int id { get; set; }
    [Required]
    public string name { get; set; }
    [Required]
    public string jobtitle { get; set; }
    [Required]
    public string number { get; set; }
    [Required]
    public string address { get; set; }
}

public class CompanyEmployee
{
    public Company company { get; set; }
    public List<Employee> employees { get; set; }
}

指数

@model MMV.Models.CompanyEmployee
@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Index</h2>
<fieldset>
    <legend>Company</legend>
    <table class="table">
        <tr>
            <th>@Html.LabelFor(m => m.company.name)</th>
        </tr>
        <tr>
            <td>@Html.EditorFor(m => m.company.name)</td>
        </tr>
    </table>
</fieldset>
<fieldset>
    <legend>Employees</legend>

        @{Html.RenderPartial("_employeeList", Model.employees);}

</fieldset>
<fieldset>
    @{Html.RenderPartial("_employee", new MMV.Models.Employee());}
</fieldset>
<div class="form-group">
    <div class="col-md-offset-2 col-md-10">
        <input type="submit" value="Submit" class="btn btn-default" />
    </div>
</div>

员工名单的部分视图

@model IEnumerable<MMV.Models.Employee>
@using (Html.BeginForm("Employees"))
{
    <table class="table">
        <tr>
            <th>
                Name
            </th>
            <th>
                Job Title
            </th>
            <th>
                Number
            </th>
            <th>
                Address
            </th>
            <th></th>
        </tr>
        @foreach (var emp in Model)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => emp.name)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => emp.jobtitle)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => emp.number)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => emp.address)
                </td>
                <td>
                    <input type="submit" formaction="/Employees/Edit/@emp.id" value="Edit"/>
                    <input type="submit"formaction="/Employees/Delete/@emp.id" value="Remove"/>
                </td>
            </tr>
        }
    </table>
}

部分视图创建员工

@model MMV.Models.Employee

@using (Html.BeginForm("Create","Employees"))
{
    <table class="table">

        @Html.ValidationSummary(true, "", new { @class = "text-danger" })

        <tr>
            <td>
                @Html.EditorFor(model => model.name)
                @Html.ValidationMessageFor(model => model.name, "", new { @class = "text-danger" })
            </td>
            <td>
                @Html.EditorFor(model => model.jobtitle)
                @Html.ValidationMessageFor(model => model.jobtitle)
            </td>
            <td>
                @Html.EditorFor(model => model.number)
                @Html.ValidationMessageFor(model => model.number, "", new { @class = "text-danger" })
            </td>
            <td>
                @Html.EditorFor(model => model.address)
                @Html.ValidationMessageFor(model => model.address, "", new { @class = "text-danger" })
            </td>
        </tr>
    </table>
    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="Create" class="btn btn-default" />
        </div>
    </div>
}

控制器 - 我使用了多个但你可以将它们全部合二为一

public class CompanyEmployeeController : Controller
{
    private MyContext db = new MyContext();

    // GET: CompanyEmployee
    public ActionResult Index()
    {
        var newCompanyEmployee = new CompanyEmployee();
        newCompanyEmployee.employees = db.EmployeeContext.ToList();
        return View(newCompanyEmployee);
    }

    [HttpPost, ActionName("Delete")]
    public ActionResult DeleteConfirmed(int id)
    {
        Employee employee = db.EmployeeContext.Find(id);
        db.EmployeeContext.Remove(employee);
        db.SaveChanges();
        return RedirectToAction("Index", "CompanyEmployee");
    }

    [HttpPost]
    public ActionResult Create([Bind(Include = "id,name,jobtitle,number,address")] Employee employee)
    {
        if (ModelState.IsValid)
        {
            db.EmployeeContext.Add(employee);
            db.SaveChanges();
            return RedirectToAction("Index", "CompanyEmployee");
        }

        return View(employee);
    }
}

更新的代码 - 使用BeginCollectionItem - 动态添加/删除

学生偏爱

@model UsefulCode.Models.Person
<div class="editorRow">
    @using (Html.BeginCollectionItem("students"))
    {
        <div class="ui-grid-c ui-responsive">
            <div class="ui-block-a">
                <span>
                    @Html.TextBoxFor(m => m.firstName)
                </span>
            </div>
            <div class="ui-block-b">
                <span>
                    @Html.TextBoxFor(m => m.lastName)
                </span>
            </div>
            <div class="ui-block-c">
                <span>
                    <span class="dltBtn">
                        <a href="#" class="deleteRow">X</a>
                    </span>
                </span>
            </div>
        </div>
    }
</div>

老师偏爱

@model UsefulCode.Models.Person
<div class="editorRow">
    @using (Html.BeginCollectionItem("teachers"))
    {
        <div class="ui-grid-c ui-responsive">
            <div class="ui-block-a">
                <span>
                    @Html.TextBoxFor(m => m.firstName)
                </span>
            </div>
            <div class="ui-block-b">
                <span>
                    @Html.TextBoxFor(m => m.lastName)
                </span>
            </div>
            <div class="ui-block-c">
                <span>
                    <span class="dltBtn">
                        <a href="#" class="deleteRow">X</a>
                    </span>
                </span>
            </div>
        </div>
    }
</div>

注册控制器

public ActionResult Index()
{
    var register = new Register
    {
        students = new List<Person>
        {
            new Person { firstName = "", lastName = "" }
        },
        teachers = new List<Person> 
        {
            new Person { lastName = "", firstName = "" }
        }
    };

    return View(register);
}

注册和人员模型

public class Register
{
    public int id { get; set; }
    public List<Person> teachers { get; set; }
    public List<Person> students { get; set; }
}

public class Person
{
    public int id { get; set; }
    public string firstName { get; set; }
    public string lastName { get; set; }
}

指数

@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@model UsefulCode.Models.Register
<div id="studentList">
@using (Html.BeginForm())
{
    <div id="editorRowsStudents">
        @foreach (var item in Model.students)
        {
            @Html.Partial("StudentView", item)
        }
    </div>
    @Html.ActionLink("Add", "StudentManager", null, new { id = "addItemStudents", @class = "button" });
}
</div>

<div id="teacherList">
@using (Html.BeginForm())
{
    <div id="editorRowsTeachers">
        @foreach (var item in Model.teachers)
        {
            @Html.Partial("TeacherView", item)
        }
    </div>
    @Html.ActionLink("Add", "TeacherManager", null, new { id = "addItemTeachers", @class = "button" });
}
</div>


@section scripts {
    <script type="text/javascript">
    $(function () {
        $('#addItemStudents').on('click', function () {
            $.ajax({
                url: '@Url.Action("StudentManager")',
                    cache: false,
                    success: function (html) { $("#editorRowsStudents").append(html); }
                });
                return false;
            });
            $('#editorRowsStudents').on('click', '.deleteRow', function () {
                $(this).closest('.editorRow').remove();
            });
            $('#addItemTeachers').on('click', function () {
                $.ajax({
                    url: '@Url.Action("TeacherManager")',
                    cache: false,
                    success: function (html) { $("#editorRowsTeachers").append(html); }
                });
                return false;
            });
            $('#editorRowsTeachers').on('click', '.deleteRow', function () {
                $(this).closest('.editorRow').remove();
            });
        });
    </script>
}

StudentManager行动:

public PartialViewResult StudentManager()
{
    return PartialView(new Person());
}