空值从 javascript 传递给控制器

Question

我检查了 SO 中的几个帖子并根据一些建议更改了我的代码，但它仍然无法正常工作。

我正在构建一个 ASP.NET 核心 MVC 应用程序。执行时，视图会显示带有 ID 的行列表。每行对应一个按钮，需要传递被点击按钮所在行的ID。

在视图中，我调用了一个 JS 函数，如下所示：

            <tr>
                <td>
                    <input type="submit" id="btnSubmit" value="Update Status" class="ids" data-id="@sheet.ID" onClick="sendId(@sheet.ID)" />
                </td>
            </tr>

JS函数如下：

    function sendId(id) {
        var rowId = parseInt(id);
        $.ajax({
            url: '/UpdateStatus/' + rowId,
            type: 'POST',
            contentType: 'application/json',
            dataType: 'json',
            success: function() { alert('Success'); },
            error: function() { alert('Error'); }
       });
       }

点击按钮时控制器操作方法被触发，但它也会触发上述 javascript 代码的错误函数，并将 null 传递给操作方法。

        [HttpPost]
        [Route("UpdateStatus/{id}")]
        public void UpdateStatus(string mID)
        {
            // Do something
        }

** 已编辑 **

按需发布完整的控制器代码。

   public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }

     
        [Route("~/UpdateStatus/{id}")]
        public void UpdateStatus([FromQuery] string mID)
        {
            // Do Something
        }

        [HttpGet]
        [Route("Index")]
        public ActionResult Index()
        {
            //TemplateData template = new TemplateData();
            List<TemplateData> templateList = new List<TemplateData>();
            templateList = ImportExcel();
            return View(templateList.AsEnumerable());
        }

        public IActionResult Privacy()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }

        private List<TemplateData> ImportExcel()
        {
            // Read Excel
            // path to your excel file
            string path = "C:\ExcelData\Results.xlsx";
            FileInfo fileInfo = new FileInfo(path);

            ExcelPackage package = new ExcelPackage(fileInfo);
            ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
            ExcelWorksheet ws = package.Workbook.Worksheets["Data"];

            List<TemplateData> templateList = new List<TemplateData>();
 

            // get number of rows and columns in the sheet
            int rowCount = ws.Dimension.Rows; // 20
            int ColCount = ws.Dimension.Columns; // 7

            // loop through the worksheet rows and columns
            for (int row = 2; row <= rowCount; row++)
            {
                TemplateData template = new TemplateData();
                template.ID = ws.Cells[row, 1].Value.ToString();

                if (ws.Cells[row,6].Value != null)
                {
                    template.EmpName = ws.Cells[row, 6].Value.ToString();
                }

                if (ws.Cells[row, 7].Value != null)
                {
                    template.WareHouse= ws.Cells[row, 7].Value.ToString();
                }

                if (ws.Cells[row, 12].Value != null)
                {
                    template.Observation = ws.Cells[row, 12].Value.ToString();
                }

                templateList.Add(template);
            }

            return templateList;
        }

    }

Answer 1

我不知道你为什么需要 ajax，但如果你仍然想要它，你必须从按钮中删除 type="submit"

<td>
 <input id="btnSubmit" value="Update Status" class="ids" onClick="sendId(@sheet.ID)" />
</td>

修复你的ajax


    $.ajax({
        url: '/UpdateStatus/' + id,
        type: 'GET',
       success: function() { alert('Success'); },
        error: function() { alert('Error'); }
   });

并从操作中删除 Post 并修复路线

[Route("~/UpdateStatus/{id}")]
public IActionResult UpdateStatus(string id)
{
    // Do something
    return Ok();
}

Answer 2

您需要更改参数名称以匹配路由，如下所示：

[HttpPost]
[Route("UpdateStatus/{id}")]
public void UpdateStatus(string id)
{
    // Do something
}

空值从 javascript 传递给控制器

Null value getting passed to controller from javascript

c#

ajax

asp.net-core-mvc

.net-core

asp.net-core