jquery - 用ajax上传图片，HttpPostedFileBase为null Mvc Asp

Question

这个问题已经有答案了:

How can I upload files asynchronously with jQuery? (34 个回答)

已关闭 9 年前。

我必须在提交表单之前上传图片。所以我用ajax来做。

这是我的帮助 Controller :

[HttpPost]
public void AcceptUpload(HttpPostedFileBase TemporaryForLast, string ReferanceNo)
{
    TemporaryForLast.SaveAs(Server.MapPath("~/Profiles/images/" + ReferanceNo + "/") + "HoldCopy" + ".jpg");
}

这是我的观点:

<input id="HoldCopy" type="file" name="HoldCopy" accept="image/*">

Ans 脚本:

$("#acceptUpload").click(function () {
    var formData= new FormData();
    var imagefile=document.getElementById("HoldCopy").files[0];
    formData.append("imageFile",imageFile);
    var xhr = new XMLHttpRequest();
    xhr.open("POST", "/Help/AcceptUpload", true);
    xhr.addEventListener("load", function (evt) { UploadComplete(evt); }, false);
    xhr.addEventListener("error", function (evt) { UploadFailed(evt); }, false);
    xhr.send(formData);
});

error功能也更新了。

Answer 1

查看

您可以使用 Jquery Ajax 代替

<script>
            function SubmitButtonOnclick()
            { 
                var formData= new FormData();
                var imagefile=document.getElementById("imageFile").files[0];
                formData.append("imageFile",imageFile);
                var xhr = new XMLHttpRequest();
                xhr.open("POST", "/Help/AcceptUpload", true);
                xhr.addEventListener("load", function (evt) { UploadComplete(evt); }, false);
                xhr.addEventListener("error", function (evt) { UploadFailed(evt); }, false);
                xhr.send(formData);

            }

      function UploadComplete(evt) {
        if (evt.target.status == 200) 
                alert("Logo uploaded successfully.");

        else 
                 alert("Error Uploading File");
        }

    function UploadFailed(evt) {
        alert("There was an error attempting to upload the file.");

    }
 </script>