AJaxFileUpload 文件上传<pre>,json字符串为空解决方法
View页面 的JS代码 其中返回值要进行序列号 dataType要大写
<script type="text/javascript">
function ajaxFileUpload(){
$.ajaxFileUpload({
url: '/FileUpload/Index', //用于文件上传的服务器端请求地址
secureuri: false, //是否需要安全协议，一般设置为false
fileElementId: 'fileName', //文件上传域的ID
dataType: 'JSON', //返回值类型 一般设置为JSON
success: function (data, status) //服务器成功响应处理函数
{
var datas = $.parseJSON(data)//此处一定要序列化
$("#img_url").val(datas.img_url);
},
error: function (data)//服务器响应失败处理函数
{
alert(data.img_url);
}
}
)
return false;
}
</script>
ajaxFileUpload代码
jQuery.extend({
createUploadIframe: function (id, uri) {
//创建 frame
var frameId = 'jUploadFrame' + id;
var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
if (window.ActiveXObject) {
if (typeof uri == 'boolean') {
iframeHtml += ' src="' + 'javascript:false' + '"';
}
else if (typeof uri == 'string') {
iframeHtml += ' src="' + uri + '"';
}
}
iframeHtml += ' />';
jQuery(iframeHtml).appendTo(document.body);
return jQuery('#' + frameId).get(0);
},
createUploadForm: function (id, fileElementId, data) {
//创建 frame
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
if (data) {
for (var i in data) {
jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
//设置属性
jQuery(form).css('position', 'absolute');
jQuery(form).css('top', '-1200px');
jQuery(form).css('left', '-1200px');
jQuery(form).appendTo('body');
return form;
},
ajaxFileUpload: function (s) {
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = new Date().getTime()
var form = jQuery.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data));
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// 监控请求
if (s.global && !jQuery.active++) {
jQuery.event.trigger("ajaxStart");
}
var requestDone = false;
// 创建请求对象
var xml = {}
if (s.global)
jQuery.event.trigger("ajaxSend", [xml, s]);
//等待一个响应返回
var uploadCallback = function (isTimeout) {
var io = document.getElementById(frameId);
try {
if (io.contentWindow) {
xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;
} else if (io.contentDocument) {
xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
}
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
if (xml || isTimeout == "timeout") {
requestDone = true;
var status;
try {
status = isTimeout != "timeout" ? "success" : "error";
//请求成功
if (status != "error") {
// 处理数据
var data = jQuery.uploadHttpData(xml, s.dataType);
if (s.success)
s.success(data, status);
// 触发全局返回
if (s.global)
jQuery.event.trigger("ajaxSuccess", [xml, s]);
} else
jQuery.handleError(s, xml, status);
} catch (e) {
status = "error";
jQuery.handleError(s, xml, status, e);
}
// 请求完成
if (s.global)
jQuery.event.trigger("ajaxComplete", [xml, s]);
// 处理全局AJAX计数器
if (s.global && ! --jQuery.active)
jQuery.event.trigger("ajaxStop");
// 处理结果
if (s.complete)
s.complete(xml, status);
jQuery(io).unbind()
setTimeout(function () {
try {
jQuery(io).remove();
jQuery(form).remove();
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
}, 100)
xml = null
}
}
// 超时检查
if (s.timeout > 0) {
setTimeout(function () {
if (!requestDone) uploadCallback("timeout");
}, s.timeout);
}
try {
var form = jQuery('#' + formId);
jQuery(form).attr('action', s.url);
jQuery(form).attr('method', 'POST');
jQuery(form).attr('target', frameId);
if (form.encoding) {
jQuery(form).attr('encoding', 'multipart/form-data');
}
else {
jQuery(form).attr('enctype', 'multipart/form-data');
}
jQuery(form).submit();
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
jQuery('#' + frameId).load(uploadCallback);
return { abort: function () { } };
},
uploadHttpData: function (r, type) {
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
if (type == "script")
jQuery.globalEval(data);
if (type == "json") {
data = r.responseText;
var start = data.indexOf(">");
if (start != -1) {
var end = data.indexOf("<", start + 1);
if (end != -1) {
data = data.substring(start + 1, end);
}
}
eval("data = " + data);
//data = jQuery.parseJSON(jQuery(data).text());
}
if (type == "html")
jQuery("<div>").html(data).evalScripts();
return data;
},
handleError: function (s, xhr, status, e) {
// If a local callback was specified, fire it
if (s.error) {
s.error.call(s.context || s, xhr, status, e);
}
// Fire the global callback
if (s.global) {
(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
}
}
})
后台Controller代码
public class FileUploadController : Controller
{
//
// GET: /FileUpload/
[HttpPost]
public JsonResult Index()
{
StringBuilder info = new StringBuilder();
foreach (string file in Request.Files)
{
HttpPostedFileBase postFile = Request.Files[file];//get post file
if (postFile.ContentLength == 0)
{
continue;
}
string name = DateTime.Now.ToFileTime().ToString();
string fileExrensio = System.IO.Path.GetExtension(Request.Files[file].FileName).ToLower();
string newFilePath = System.Web.HttpContext.Current.Server.MapPath("/upload/");//save path
postFile.SaveAs(newFilePath + name + fileExrensio);//save file
info.Append("/upload/" + name + fileExrensio);
}
return Json(new { img_url = info.ToString() }, "text/html;charset=UTF-8");//一定要制定格式
}
}
