Javascript 向AJAX请求返回空字符串
我有一个对函数的AJAX调用:Javascript 向AJAX请求返回空字符串,javascript,jquery,asp.net-mvc,ajax,Javascript,Jquery,Asp.net Mvc,Ajax,我有一个对函数的AJAX调用: $('#DeviceType').change(function () { // when the selection of the device type drop down changes // get the new value var devicetype = $(this).val(); $.ajax({ url: '@Url.Action("GetEquipmentCode")', type: 'PO
$('#DeviceType').change(function () {
// when the selection of the device type drop down changes
// get the new value
var devicetype = $(this).val();
$.ajax({
url: '@Url.Action("GetEquipmentCode")',
type: 'POST',
data: { deviceTypeID: devicetype },
success: function (result) {
// when the AJAX succeeds refresh the EquipmentCode text box
$('#EquipmentCode').val(result);
}
});
});
功能为
[HttpPost]
public string GetEquipmentCode(int deviceTypeID)
{
var deviceType = _db.DeviceTypes.Single(d => d.ID == deviceTypeID);
return (deviceType.EquipmentCode != null) ?
deviceType.EquipmentCode.Code :
String.Empty;
}
但是,如果函数返回String.Empty
,我在文本框中实际得到的字符串是“[object XMLDocument]
”。如何在文本框中获取空字符串的结果?试试看
....
data: { deviceTypeID: devicetype },
dataType : 'html',
...
默认情况下,jquery尝试猜测,有时可能不准确
JSON可能是最简单的 尝试: 然后在你的行动方法中
[HttpPost]
public ActionResult GetEquipmentCode(int deviceTypeID)
{
var deviceType = _db.DeviceTypes.Single(d => d.ID == deviceTypeID);
return Json((deviceType.EquipmentCode != null) ?
deviceType.EquipmentCode.Code :
String.Empty);
}
AJAX响应应该是XML还是JSON?这是来自WCF还是MVC操作方法?MVC操作方法。还有XML或JSON-也许这是我应该返回的而不是字符串?只是将
的“text”
更改为“html
”
[HttpPost]
public ActionResult GetEquipmentCode(int deviceTypeID)
{
var deviceType = _db.DeviceTypes.Single(d => d.ID == deviceTypeID);
return Json((deviceType.EquipmentCode != null) ?
deviceType.EquipmentCode.Code :
String.Empty);
}