javascript - 如何将对象列表从 View 中的 javascript 代码传递到 Controller 中的操作方法

Question

我在 javascript 编程方面没有太多经验。我想将对象列表从“View”中的 javascript 代码传递到 MVC“Controller”中的操作方法。这是我想要实现的目标——

MVC 模型和 Controller :

 Public Class Student
    {
        Public int Id {get; set;}
        Public string Name {get; set;}
        Public string Address {get; set;}
    }

    Public class StudentController : Controller
     {
        Public ActionResult Index()
        {
            // Read the data from database, create a list of “Student”
            return View(“Display”, StudentList);
        }

        [HttpPost]
        Public ActionResult OrderStudentList(List<Student> StudentList)
        {
            // Code to ascend/descend list
        }
     }

显示.cshtml

    @model IEnumerable<Student>
    // Code that displays student list
    <button onclick="myFunction()">Student Name</button>
    <script>
        function myFunction()
            {
                var studentL = @Model.ToList();
                $.ajax({
                url: "@Url.Action("OrderStudentList ", "Student")",
                type: "POST",
                contentType: "application/json",
                data: JSON.stringify({ StudentList: studentL }),
                success: function (response) {
                response ? alert("It worked!") : alert("It didn't work.");
                }
            });    
    </script>

如您所见，我将“学生”列表传递给名为“显示”的 View 。该 View 有一个名为“Student Name”的按钮。单击该按钮时，我想将“Student”列表传递给“StudentController”中的操作方法“OrderStudentList”，它将按升序/降序排列列表。但是当我运行代码时，我从未在方法“OrderStudentList”中获得列表的任何值。

到目前为止，这是我在上面的代码中尝试分配数据值的方法

    data:’@Html.Raw(Model.ToList())’

    data: @Html.Raw(Json.Encode(Model.ToList()));

 Converted a list to an array and tried to copy each element of a list 
   individually to an element of javascript array as follows

        var arrayJs = [];
        for(var i=0; i<= @Model.Count(); i++)
        {
            arrayJs.push(@Model.ElementAt(i));
        }

   But it gives the syntax error with the “i does not exist in 
   the current context”.
 Created a ViewModel with Student list as a property

        Class StudentList
        {
            Public List<Student> StudentList {get; set;}
        }

   Tried passing an instance of a viewModel as a JSON object to action  
   method “OrderStudentList”.

没有任何效果。如果有人提供帮助，我将不胜感激。谢谢

Answer 1

我不太确定你期望这条线做什么:

var studentL = @Model.ToList();

但无论如何，您需要立即将模型转换为 JSON，您的 Javascript 函数需要如下所示:

function myFunction() {
    $.ajax({
        url: "@Url.Action("OrderStudentList", "Student")",
        type: "POST",
        contentType: "application/json",
        data: '@Html.Raw(JsonConvert.SerializeObject(Model.ToList()))',
        success: function (response) {
            response ? alert("It worked!") : alert("It didn't work.");
        }
    });
} 

并且您的 Action 方法需要具有以下签名:

    [HttpPost]
    Public ActionResult OrderStudentList(List<Student> model)
    {
        // Code to ascend/descend list
    }