无法通过 AJAX 向控制器发送表单数据和文件上传

Unable to send Form Data & File Upload via AJAX to controller

我正在尝试从我的视图发送一堆表单数据并将其映射到我的控制器中的 ViewModel 参数。此外,我正在尝试使用此请求发送一个文件,该文件将映射到一个单独的参数。

formData 被发送到控制器时,它正确地将文件上传映射到 file 参数,但是,model 参数属性都是 null/defaults .

总而言之,我的问题是:如何在发送文件的同时将表单元素值映射到控制器中的 MyViewModel 参数?

型号:

public class MyViewModel
{
    public int AsssumptionSetId { get; set; }
    public int BuildingBlockId { get; set; }
    public string ReplacementCode { get; set; }
    public decimal Rounding { get; set; }
    public string DataSource { get; set; }
    public bool AER { get; set; }
    public int Term { get; set; }
}

查看:

此视图是 MyViewModel 的强类型:

<form id="buildingBlockForm">

    @Html.HiddenFor(model => model.AsssumptionSetId)
    @Html.HiddenFor(model => model.BuildingBlockId)

    @Html.TextBoxFor(m => m.ReplacementCode)

    @Html.TextBoxFor(m => m.Rounding)

    @Html.DropDownListFor(m => m.DataSource, (SelectList)ViewBag.DataSources)

    @Html.DropDownListFor(m => m.Term, (SelectList)ViewBag.Terms)

    @Html.CheckBoxFor(m => m.AER)

    <input type="file" id="file" name="file" />

    <input class="button green-button" type="submit" value="Create" />

</form>

控制器:

  public ActionResult CreateBuildingBlock(MyViewModel model, HttpPostedFileBase file)
        {
            // all of the 'model' properties = null instead of the form values
            // file = the file I chose to upload and works as expected
        }

JS:

var formData = new FormData($('#buildingBlockForm'));

// Get file and append to form data (Should only be 1)
$.each(Files["csv"], function (key, value) {
    formData .append("file", value);
});

// Send file
$.ajax({
    url: '/Assumptions/CreateBuildingBlock',
    type: 'POST',
    data: formData,
    cache: false,
    dataType: "json",
    contentType: false,
    processData: false,

    success: function (response) {
        // Handle success
    },
    error: function (xhr, status, errorThrown) {
        // Handle errors
    }
});

由于您的表单包含文件输入类型,因此您需要您的表单来处理此提交 (enctype)。

<form id="buildingBlockForm" enctype="multipart/form-data"> 

此外,如果您想坚持使用 MVC 的表单助手,它会缓解您使用基于脚本的 ajax post.

可能遇到的问题
@using (Ajax.BeginForm("CreateBuildingBlock", "Assumptions", null, new AjaxOptions { HttpMethod = "POST", OnSuccess = "postSuccess", OnFailure = "postFailed" }, new { enctype = "multipart/form-data" }))
{
  // your form fields here
}

<script>
  function postSuccess() {
    // handle success here
  }

  function postfailed() {
    // handle failed post here
  }
</script>

原来我在抓取需要序列化的表单时缺少索引。

new FormData($('#buildingBlockForm')[0]);

这解决了我的问题。