这是我的ajax代码,它提交了一个带有文件的表单数据。如果我总是删除我的自定义字符串"has"文件,它将起作用并返回"1234567".我希望返回具有"具有文件1234567"但总是抛出 [object] 对象
$( document ).ready(function() {
$('#scan').change(function (e) {
debugger
var element = this;
var formData = new FormData();
var totalFiles = document.getElementById("scan").files.length;
var file = document.getElementById("scan").files[0];
formData.append("scan", file);
$.ajax({
url: '@Url.Action("scancode", "Products")',
type: "POST",
dataType: "json",
data: formData,
processData: false,
contentType: false,
success: function (data) {
$('#barcode').val(data);
},
error: function (err) {
document.getElementById('emsg').innerHTML = err;
}
});
});
});
控制器
public string scancode(HttpPostedFileBase scan) {
var str = "";
if (scan !=null)
{
str = "has file";
}
try
{
IBarcodeReader reader = new BarcodeReader();
// load a bitmap
var barcodeBitmap = (Bitmap)Bitmap.FromStream(scan.InputStream);
// detect and decode the barcode inside the bitmap
var result = reader.Decode(barcodeBitmap);
// do something with the result
if (result != null)
{
str =str+ result.Text;
}
}
catch (Exception ex)
{
str = ex.Message;
}
return str;
}
您必须始终将JsonResult
从控制器返回到 ajax 查询。只需使用Json(stringvalue);
将字符串转换为JsonResult
您的代码将变为:
public JsonResult scancode(HttpPostedFileBase scan)
{
var str = "";
if (scan !=null)
{
str = "has file";
}
try
{
IBarcodeReader reader = new BarcodeReader();
// load a bitmap
var barcodeBitmap = (Bitmap)Bitmap.FromStream(scan.InputStream);
// detect and decode the barcode inside the bitmap
var result = reader.Decode(barcodeBitmap);
// do something with the result
if (result != null)
{
str =str+ result.Text;
}
}
catch (Exception ex)
{
str = ex.Message;
}
return Json(str);
}
您实际上无法从 ajax 调用返回字符串。改为返回 JSON 对象。将返回类型更改为JsonResult
:
public JsonResult scancode(HttpPostedFileBase scan)
而不是return str;
返回 Json:
return Json(new { someString = str });
最后,你的 ajax 调用应该看起来像这样:
success: function (data) { $('#barcode').val(data.someString); }