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I have a large(ish) form in MVC.
I need to be able to generate an excel file containing data from a subset of that form.
The tricky bit is that this shouldn't affect the rest of the form and so I want to do it via AJAX. I've come across a few questions on SO that seem to be related, but I can't quite work out what the answers mean.
This one seems the closest to what I'm after: asp-net-mvc-downloading-excel - but I'm not sure I understand the response, and it is a couple years old now. I also came across another article (can't find it anymore) about using an iframe to handle the file download, but I'm not sure how to get this working with MVC.
My excel file returns fine if I'm doing a full post back but I can't get it working with AJAX in mvc.
You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working).
UPDATE September 2016
My original answer (below) was over 3 years old, so I thought I would update as I no longer create files on the server when downloading files via AJAX however, I have left the original answer as it may be of some use still depending on your specific requirements.
A common scenario in my MVC applications is reporting via a web page that has some user configured report parameters (Date Ranges, Filters etc.). When the user has specified the parameters they post them to the server, the report is generated (say for example an Excel file as output) and then I store the resulting file as a byte array in the TempData bucket with a unique reference. This reference is passed back as a Json Result to my AJAX function that subsequently redirects to separate controller action to extract the data from TempData and download to the end users browser.
To give this more detail, assuming you have a MVC View that has a form bound to a Model class, lets call the Model ReportVM.
First, a controller action is required to receive the posted model, an example would be:
public ActionResult PostReportPartial(ReportVM model){
// Validate the Model is correct and contains valid data
// Generate your report output based on the model parameters
// This can be an Excel, PDF, Word file - whatever you need.
// As an example lets assume we've generated an EPPlus ExcelPackage
ExcelPackage workbook = new ExcelPackage();
// Do something to populate your workbook
// Generate a new unique identifier against which the file can be stored
string handle = Guid.NewGuid().ToString();
using(MemoryStream memoryStream = new MemoryStream()){
workbook.SaveAs(memoryStream);
memoryStream.Position = 0;
TempData[handle] = memoryStream.ToArray();
}
// Note we are returning a filename as well as the handle
return new JsonResult() {
Data = new { FileGuid = handle, FileName = "TestReportOutput.xlsx" }
};
}
The AJAX call that posts my MVC form to the above controller and receives the response looks like this:
$ajax({
cache: false,
url: '/Report/PostReportPartial',
data: _form.serialize(),
success: function (data){
var response = JSON.parse(data);
window.location = '/Report/Download?fileGuid=' + response.FileGuid
+ '&filename=' + response.FileName;
}
})
The controller action to handle the downloading of the file:
[HttpGet]
public virtual ActionResult Download(string fileGuid, string fileName)
{
if(TempData[fileGuid] != null){
byte[] data = TempData[fileGuid] as byte[];
return File(data, "application/vnd.ms-excel", fileName);
}
else{
// Problem - Log the error, generate a blank file,
// redirect to another controller action - whatever fits with your application
return new EmptyResult();
}
}
One other change that could easily be accommodated if required is to pass the MIME Type of the file as a third parameter so that the one Controller action could correctly serve a variety of output file formats.
This removes any need for any physical files to created and stored on the server, so no housekeeping routines required and once again this is seamless to the end user.
Note, the advantage of using TempData rather than Session is that once TempData is read the data is cleared so it will be more efficient in terms of memory usage if you have a high volume of file requests. See TempData Best Practice.
ORIGINAL Answer
You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working).
Once the file has been created on the server pass back the path to the file (or just the filename) as the return value to your AJAX call and then set the JavaScript window.location to this URL which will prompt the browser to download the file.
From the end users perspective, the file download operation is seamless as they never leave the page on which the request originates.
Below is a simple contrived example of an ajax call to achieve this:
$.ajax({
type: 'POST',
url: '/Reports/ExportMyData',
data: '{ "dataprop1": "test", "dataprop2" : "test2" }',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (returnValue) {
window.location = '/Reports/Download?file=' + returnValue;
}
});
url parameter is the Controller/Action method where your code will create the Excel file.
data parameter contains the json data that would be extracted from the form.
returnValue would be the file name of your newly created Excel file.
The window.location command redirects to the Controller/Action method that actually returns your file for download.
A sample controller method for the Download action would be:
[HttpGet]
public virtual ActionResult Download(string file)
{
string fullPath = Path.Combine(Server.MapPath("~/MyFiles"), file);
return File(fullPath, "application/vnd.ms-excel", file);
}
My 2 cents - you don't need to store the excel as a physical file on the server - instead, store it in the (Session) Cache. Use a uniquely generated name for your Cache variable (that stores that excel file) - this will be the return of your (initial) ajax call. This way you don't have to deal with file access issues, managing (deleting) the files when not needed, etc. and, having the file in the Cache, is faster to retrieve it.
I was recently able to accomplish this in MVC (although there was no need to use AJAX) without creating a physical file and thought I'd share my code:
Super simple JavaScript function (datatables.net button click triggers this):
function getWinnersExcel(drawingId) {
window.location = "/drawing/drawingwinnersexcel?drawingid=" + drawingId;
}
C# Controller code:
public FileResult DrawingWinnersExcel(int drawingId)
{
MemoryStream stream = new MemoryStream(); // cleaned up automatically by MVC
List<DrawingWinner> winnerList = DrawingDataAccess.GetWinners(drawingId); // simple entity framework-based data retrieval
ExportHelper.GetWinnersAsExcelMemoryStream(stream, winnerList, drawingId);
string suggestedFilename = string.Format("Drawing_{0}_Winners.xlsx", drawingId);
return File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml", suggestedFilename);
}
In the ExportHelper class I do use a 3rd party tool (GemBox.Spreadsheet) to generate the Excel file and it has a Save to Stream option. That being said, there are a number of ways to create Excel files that can easily be written to a memory stream.
public static class ExportHelper
{
internal static void GetWinnersAsExcelMemoryStream(MemoryStream stream, List<DrawingWinner> winnerList, int drawingId)
{
ExcelFile ef = new ExcelFile();
// lots of excel worksheet building/formatting code here ...
ef.SaveXlsx(stream);
stream.Position = 0; // reset for future read
}
}
In IE, Chrome, and Firefox, the browser prompts to download the file and no actual navigation occurs.
First Create the controller action that will create the Excel File
[HttpPost]
public JsonResult ExportExcel()
{
DataTable dt = DataService.GetData();
var fileName = "Excel_" + DateTime.Now.ToString("yyyyMMddHHmm") + ".xls";
//save the file to server temp folder
string fullPath = Path.Combine(Server.MapPath("~/temp"), fileName);
using (var exportData = new MemoryStream())
{
//I don't show the detail how to create the Excel, this is not the point of this article,
//I just use the NPOI for Excel handler
Utility.WriteDataTableToExcel(dt, ".xls", exportData);
FileStream file = new FileStream(fullPath, FileMode.Create, FileAccess.Write);
exportData.WriteTo(file);
file.Close();
}
var errorMessage = "you can return the errors in here!";
//return the Excel file name
return Json(new { fileName = fileName, errorMessage = "" });
}
then create the Download action
[HttpGet]
[DeleteFileAttribute] //Action Filter, it will auto delete the file after download,
//I will explain it later
public ActionResult Download(string file)
{
//get the temp folder and file path in server
string fullPath = Path.Combine(Server.MapPath("~/temp"), file);
//return the file for download, this is an Excel
//so I set the file content type to "application/vnd.ms-excel"
return File(fullPath, "application/vnd.ms-excel", file);
}
if you want to delete the file after downloaded create this
public class DeleteFileAttribute : ActionFilterAttribute
{
public override void OnResultExecuted(ResultExecutedContext filterContext)
{
filterContext.HttpContext.Response.Flush();
//convert the current filter context to file and get the file path
string filePath = (filterContext.Result as FilePathResult).FileName;
//delete the file after download
System.IO.File.Delete(filePath);
}
}
and finally ajax call from you MVC Razor view
//I use blockUI for loading...
$.blockUI({ message: '<h3>Please wait a moment...</h3>' });
$.ajax({
type: "POST",
url: '#Url.Action("ExportExcel","YourController")', //call your controller and action
contentType: "application/json; charset=utf-8",
dataType: "json",
}).done(function (data) {
//console.log(data.result);
$.unblockUI();
//get the file name for download
if (data.fileName != "") {
//use window.location.href for redirect to download action for download the file
window.location.href = "#Url.RouteUrl(new
{ Controller = "YourController", Action = "Download"})/?file=" + data.fileName;
}
});
I used the solution posted by CSL but I would recommend you dont store the file data in Session during the whole session. By using TempData the file data is automatically removed after the next request (which is the GET request for the file). You could also manage removal of the file data in Session in download action.
Session could consume much memory/space depending on SessionState storage and how many files are exported during the session and if you have many users.
I've updated the serer side code from CSL to use TempData instead.
public ActionResult PostReportPartial(ReportVM model){
// Validate the Model is correct and contains valid data
// Generate your report output based on the model parameters
// This can be an Excel, PDF, Word file - whatever you need.
// As an example lets assume we've generated an EPPlus ExcelPackage
ExcelPackage workbook = new ExcelPackage();
// Do something to populate your workbook
// Generate a new unique identifier against which the file can be stored
string handle = Guid.NewGuid().ToString()
using(MemoryStream memoryStream = new MemoryStream()){
workbook.SaveAs(memoryStream);
memoryStream.Position = 0;
TempData[handle] = memoryStream.ToArray();
}
// Note we are returning a filename as well as the handle
return new JsonResult() {
Data = new { FileGuid = handle, FileName = "TestReportOutput.xlsx" }
};
}
[HttpGet]
public virtual ActionResult Download(string fileGuid, string fileName)
{
if(TempData[fileGuid] != null){
byte[] data = TempData[fileGuid] as byte[];
return File(data, "application/vnd.ms-excel", fileName);
}
else{
// Problem - Log the error, generate a blank file,
// redirect to another controller action - whatever fits with your application
return new EmptyResult();
}
}
using ClosedXML.Excel;
public ActionResult Downloadexcel()
{
var Emplist = JsonConvert.SerializeObject(dbcontext.Employees.ToList());
DataTable dt11 = (DataTable)JsonConvert.DeserializeObject(Emplist, (typeof(DataTable)));
dt11.TableName = "Emptbl";
FileContentResult robj;
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(dt11);
using (MemoryStream stream = new MemoryStream())
{
wb.SaveAs(stream);
var bytesdata = File(stream.ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "myFileName.xlsx");
robj = bytesdata;
}
}
return Json(robj, JsonRequestBehavior.AllowGet);
}
$.ajax({
type: "GET",
url: "/Home/Downloadexcel/",
contentType: "application/json; charset=utf-8",
data: null,
success: function (Rdata) {
debugger;
var bytes = new Uint8Array(Rdata.FileContents);
var blob = new Blob([bytes], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = "myFileName.xlsx";
link.click();
},
error: function (err) {
}
});
The accepted answer didn't quite work for me as I got a 502 Bad Gateway result from the ajax call even though everything seemed to be returning fine from the controller.
Perhaps I was hitting a limit with TempData - not sure, but I found that if I used IMemoryCache instead of TempData, it worked fine, so here is my adapted version of the code in the accepted answer:
public ActionResult PostReportPartial(ReportVM model){
// Validate the Model is correct and contains valid data
// Generate your report output based on the model parameters
// This can be an Excel, PDF, Word file - whatever you need.
// As an example lets assume we've generated an EPPlus ExcelPackage
ExcelPackage workbook = new ExcelPackage();
// Do something to populate your workbook
// Generate a new unique identifier against which the file can be stored
string handle = Guid.NewGuid().ToString();
using(MemoryStream memoryStream = new MemoryStream()){
workbook.SaveAs(memoryStream);
memoryStream.Position = 0;
//TempData[handle] = memoryStream.ToArray();
//This is an equivalent to tempdata, but requires manual cleanup
_cache.Set(handle, memoryStream.ToArray(),
new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromMinutes(10)));
//(I'd recommend you revise the expiration specifics to suit your application)
}
// Note we are returning a filename as well as the handle
return new JsonResult() {
Data = new { FileGuid = handle, FileName = "TestReportOutput.xlsx" }
};
}
AJAX call remains as with the accepted answer (I made no changes):
$ajax({
cache: false,
url: '/Report/PostReportPartial',
data: _form.serialize(),
success: function (data){
var response = JSON.parse(data);
window.location = '/Report/Download?fileGuid=' + response.FileGuid
+ '&filename=' + response.FileName;
}
})
The controller action to handle the downloading of the file:
[HttpGet]
public virtual ActionResult Download(string fileGuid, string fileName)
{
if (_cache.Get<byte[]>(fileGuid) != null)
{
byte[] data = _cache.Get<byte[]>(fileGuid);
_cache.Remove(fileGuid); //cleanup here as we don't need it in cache anymore
return File(data, "application/vnd.ms-excel", fileName);
}
else
{
// Something has gone wrong...
return View("Error"); // or whatever/wherever you want to return the user
}
}
...
Now there is some extra code for setting up MemoryCache...
In order to use "_cache" I injected in the constructor for the controller like so:
using Microsoft.Extensions.Caching.Memory;
namespace MySolution.Project.Controllers
{
public class MyController : Controller
{
private readonly IMemoryCache _cache;
public LogController(IMemoryCache cache)
{
_cache = cache;
}
//rest of controller code here
}
}
And make sure you have the following in ConfigureServices in Startup.cs:
services.AddDistributedMemoryCache();
$.ajax({
global: false,
url: SitePath + "/User/ExportTeamMembersInExcel",
"data": { 'UserName': UserName, 'RoleId': RoleId, UserIds: AppraseeId },
"type": "POST",
"dataType": "JSON",
"success": function (result) {
var bytes = new Uint8Array(result.FileContents);
var blob = new Blob([bytes], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = "myFileName.xlsx";
link.click();
},
"error": function () {
alert("error");
}
})
[HttpPost]
public JsonResult ExportTeamMembersInExcel(string UserName, long? RoleId, string[] UserIds)
{
MemoryStream stream = new MemoryStream();
FileContentResult robj;
DataTable data = objuserservice.ExportTeamToExcel(UserName, RoleId, UserIds);
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(data, "TeamMembers");
using (stream)
{
wb.SaveAs(stream);
}
}
robj = File(stream.ToArray(), System.Net.Mime.MediaTypeNames.Application.Octet, "TeamMembers.xlsx");
return Json(robj, JsonRequestBehavior.AllowGet);
}
I may sound quite naive, and may attract quite a criticism, but here's how I did it,
(It doesn't involve ajax for export, but it doesn't do a full postback either )
Thanks for this post and this answer.
Create a simple controller
public class HomeController : Controller
{
/* A demo action
public ActionResult Index()
{
return View(model);
}
*/
[HttpPost]
public FileResult ExportData()
{
/* An example filter
var filter = TempData["filterKeys"] as MyFilter;
TempData.Keep(); */
var someList = db.GetDataFromDb(/*filter*/) // filter as an example
/*May be here's the trick, I'm setting my filter in TempData["filterKeys"]
in an action,(GetFilteredPartial() illustrated below) when 'searching' for the data,
so do not really need ajax here..to pass my filters.. */
//Some utility to convert list to Datatable
var dt = Utility.ConvertToDataTable(someList);
// I am using EPPlus nuget package
using (ExcelPackage pck = new ExcelPackage())
{
ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Sheet1");
ws.Cells["A1"].LoadFromDataTable(dt, true);
using (var memoryStream = new MemoryStream())
{
pck.SaveAs(memoryStream);
return File(memoryStream.ToArray(),
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
"ExportFileName.xlsx");
}
}
}
//This is just a supporting example to illustrate setting up filters ..
/* [HttpPost]
public PartialViewResult GetFilteredPartial(MyFilter filter)
{
TempData["filterKeys"] = filter;
var filteredData = db.GetConcernedData(filter);
var model = new MainViewModel();
model.PartialViewModel = filteredData;
return PartialView("_SomePartialView", model);
} */
}
And here are the Views..
/*Commenting out the View code, in order to focus on the imp. code
#model Models.MainViewModel
#{Layout...}
Some code for, say, a partial View
<div id="tblSampleBody">
#Html.Partial("_SomePartialView", Model.PartialViewModel)
</div>
*/
//The actual part.. Just **posting** this bit of data from the complete View...
//Here, you are not posting the full Form..or the complete View
#using (Html.BeginForm("ExportData", "Home", FormMethod.Post))
{
<input type="submit" value="Export Data" />
}
//...
//</div>
/*And you may require to pass search/filter values.. as said in the accepted answer..
That can be done while 'searching' the data.. and not while
we need an export..for instance:-
<script>
var filterData = {
SkipCount: someValue,
TakeCount: 20,
UserName: $("#UserName").val(),
DepartmentId: $("#DepartmentId").val(),
}
function GetFilteredData() {
$("#loader").show();
filterData.SkipCount = 0;
$.ajax({
url: '#Url.Action("GetFilteredPartial","Home")',
type: 'POST',
dataType: "html",
data: filterData,
success: function (dataHTML) {
if ((dataHTML === null) || (dataHTML == "")) {
$("#tblSampleBody").html('<tr><td>No Data Returned</td></tr>');
$("#loader").hide();
} else {
$("#tblSampleBody").html(dataHTML);
$("#loader").hide();
}
}
});
}
</script>*/
The whole point of the trick seems that, we are posting a form (a part of the Razor View ) upon which we are calling an Action method, which returns: a FileResult, and this FileResult returns the Excel File..
And for posting the filter values, as said, ( and if you require to), I am making a post request to another action, as has been attempted to describe..
This thread helped me create my own solution that I will share here. I was using a GET ajax request at first without issues but it got to a point where the request URL length was exceeded so I had to swith to a POST.
The javascript uses JQuery file download plugin and consists of 2 succeeding calls. One POST (To send params) and one GET to retreive the file.
function download(result) {
$.fileDownload(uri + "?guid=" + result,
{
successCallback: onSuccess.bind(this),
failCallback: onFail.bind(this)
});
}
var uri = BASE_EXPORT_METADATA_URL;
var data = createExportationData.call(this);
$.ajax({
url: uri,
type: 'POST',
contentType: 'application/json',
data: JSON.stringify(data),
success: download.bind(this),
fail: onFail.bind(this)
});
Server side
[HttpPost]
public string MassExportDocuments(MassExportDocumentsInput input)
{
// Save query for file download use
var guid = Guid.NewGuid();
HttpContext.Current.Cache.Insert(guid.ToString(), input, null, DateTime.Now.AddMinutes(5), Cache.NoSlidingExpiration);
return guid.ToString();
}
[HttpGet]
public async Task<HttpResponseMessage> MassExportDocuments([FromUri] Guid guid)
{
//Get params from cache, generate and return
var model = (MassExportDocumentsInput)HttpContext.Current.Cache[guid.ToString()];
..... // Document generation
// to determine when file is downloaded
HttpContext.Current
.Response
.SetCookie(new HttpCookie("fileDownload", "true") { Path = "/" });
return FileResult(memoryStream, "documents.zip", "application/zip");
}
CSL's answer was implemented in a project I'm working on but the problem I incurred was scaling out on Azure broke our file downloads. Instead, I was able to do this with one AJAX call:
SERVER
[HttpPost]
public FileResult DownloadInvoice(int id1, int id2)
{
//necessary to get the filename in the success of the ajax callback
HttpContext.Response.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");
byte[] fileBytes = _service.GetInvoice(id1, id2);
string fileName = "Invoice.xlsx";
return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, fileName);
}
CLIENT
(modified version of Handle file download from ajax post)
$("#downloadInvoice").on("click", function() {
$("#loaderInvoice").removeClass("d-none");
var xhr = new XMLHttpRequest();
var params = [];
xhr.open('POST', "#Html.Raw(Url.Action("DownloadInvoice", "Controller", new { id1 = Model.Id1, id2 = Model.Id2 }))", true);
xhr.responseType = 'arraybuffer';
xhr.onload = function () {
if (this.status === 200) {
var filename = "";
var disposition = xhr.getResponseHeader('Content-Disposition');
if (disposition && disposition.indexOf('attachment') !== -1) {
var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
var matches = filenameRegex.exec(disposition);
if (matches != null && matches[1]) filename = matches[1].replace(/['"]/g, '');
}
var type = xhr.getResponseHeader('Content-Type');
var blob = typeof File === 'function'
? new File([this.response], filename, { type: type })
: new Blob([this.response], { type: type });
if (typeof window.navigator.msSaveBlob !== 'undefined') {
// IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed."
window.navigator.msSaveBlob(blob, filename);
} else {
var URL = window.URL || window.webkitURL;
var downloadUrl = URL.createObjectURL(blob);
if (filename) {
// use HTML5 a[download] attribute to specify filename
var a = document.createElement("a");
// safari doesn't support this yet
if (typeof a.download === 'undefined') {
window.location = downloadUrl;
} else {
a.href = downloadUrl;
a.download = filename;
document.body.appendChild(a);
a.click();
}
} else {
window.location = downloadUrl;
}
setTimeout(function() {
URL.revokeObjectURL(downloadUrl);
$("#loaderInvoice").addClass("d-none");
}, 100); // cleanup
}
}
};
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xhr.send($.param(params));
});
This works for me. Make sure you return a File from your controller action with contentType as "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" and file name as e.g. "List.xlsx" which should be the same as in the AJAX success call. I have used ClosedXML NuGet package to generate the excel file.
$.ajax({
url: "Home/Export",
type: 'GET',
contentType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
xhrFields: { responseType: 'blob' },
success: function (data) {
var a = document.createElement('a');
var url = window.URL.createObjectURL(data);
a.href = url;
a.download = 'List.xlsx';
a.click();
window.URL.revokeObjectURL(url);
}
});
I am using Asp.Net WebForm and just I wanna to download a file from server side. There is a lot article but I cannot find just basic answer.
Now, I tried a basic way and got it.
That's my problem.
I have to create a lot of input button dynamically on runtime. And I want to add each button to download button with giving an unique fileNumber.
I create each button like this:
fragment += "<div><input type=\"button\" value=\"Create Excel\" onclick=\"CreateExcelFile(" + fileNumber + ");\" /></div>";
Each button call this ajax method.
$.ajax({
type: 'POST',
url: 'index.aspx/CreateExcelFile',
data: jsonData,
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (returnValue) {
window.location = '/Reports/Downloads/' + returnValue.d;
}
});
Then I wrote a basic simple method.
[WebMethod]
public static string CreateExcelFile2(string fileNumber)
{
string filePath = string.Format(#"Form_{0}.xlsx", fileNumber);
return filePath;
}
I am generating this Form_1, Form_2, Form_3.... And I am going to delete this old files with another program. But if there is a way to just sending byte array to download file like using Response. I wanna to use it.
I hope this will be usefull for anyone.
On Submit form
public ActionResult ExportXls()
{
var filePath="";
CommonHelper.WriteXls(filePath, "Text.xls");
}
public static void WriteXls(string filePath, string targetFileName)
{
if (!String.IsNullOrEmpty(filePath))
{
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.Charset = "utf-8";
response.ContentType = "text/xls";
response.AddHeader("content-disposition", string.Format("attachment; filename={0}", targetFileName));
response.BinaryWrite(File.ReadAllBytes(filePath));
response.End();
}
}
I have a large(ish) form in MVC.
I need to be able to generate an excel file containing data from a subset of that form.
The tricky bit is that this shouldn't affect the rest of the form and so I want to do it via AJAX. I've come across a few questions on SO that seem to be related, but I can't quite work out what the answers mean.
This one seems the closest to what I'm after: asp-net-mvc-downloading-excel - but I'm not sure I understand the response, and it is a couple years old now. I also came across another article (can't find it anymore) about using an iframe to handle the file download, but I'm not sure how to get this working with MVC.
My excel file returns fine if I'm doing a full post back but I can't get it working with AJAX in mvc.
You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working).
UPDATE September 2016
My original answer (below) was over 3 years old, so I thought I would update as I no longer create files on the server when downloading files via AJAX however, I have left the original answer as it may be of some use still depending on your specific requirements.
A common scenario in my MVC applications is reporting via a web page that has some user configured report parameters (Date Ranges, Filters etc.). When the user has specified the parameters they post them to the server, the report is generated (say for example an Excel file as output) and then I store the resulting file as a byte array in the TempData bucket with a unique reference. This reference is passed back as a Json Result to my AJAX function that subsequently redirects to separate controller action to extract the data from TempData and download to the end users browser.
To give this more detail, assuming you have a MVC View that has a form bound to a Model class, lets call the Model ReportVM.
First, a controller action is required to receive the posted model, an example would be:
public ActionResult PostReportPartial(ReportVM model){
// Validate the Model is correct and contains valid data
// Generate your report output based on the model parameters
// This can be an Excel, PDF, Word file - whatever you need.
// As an example lets assume we've generated an EPPlus ExcelPackage
ExcelPackage workbook = new ExcelPackage();
// Do something to populate your workbook
// Generate a new unique identifier against which the file can be stored
string handle = Guid.NewGuid().ToString();
using(MemoryStream memoryStream = new MemoryStream()){
workbook.SaveAs(memoryStream);
memoryStream.Position = 0;
TempData[handle] = memoryStream.ToArray();
}
// Note we are returning a filename as well as the handle
return new JsonResult() {
Data = new { FileGuid = handle, FileName = "TestReportOutput.xlsx" }
};
}
The AJAX call that posts my MVC form to the above controller and receives the response looks like this:
$ajax({
cache: false,
url: '/Report/PostReportPartial',
data: _form.serialize(),
success: function (data){
var response = JSON.parse(data);
window.location = '/Report/Download?fileGuid=' + response.FileGuid
+ '&filename=' + response.FileName;
}
})
The controller action to handle the downloading of the file:
[HttpGet]
public virtual ActionResult Download(string fileGuid, string fileName)
{
if(TempData[fileGuid] != null){
byte[] data = TempData[fileGuid] as byte[];
return File(data, "application/vnd.ms-excel", fileName);
}
else{
// Problem - Log the error, generate a blank file,
// redirect to another controller action - whatever fits with your application
return new EmptyResult();
}
}
One other change that could easily be accommodated if required is to pass the MIME Type of the file as a third parameter so that the one Controller action could correctly serve a variety of output file formats.
This removes any need for any physical files to created and stored on the server, so no housekeeping routines required and once again this is seamless to the end user.
Note, the advantage of using TempData rather than Session is that once TempData is read the data is cleared so it will be more efficient in terms of memory usage if you have a high volume of file requests. See TempData Best Practice.
ORIGINAL Answer
You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working).
Once the file has been created on the server pass back the path to the file (or just the filename) as the return value to your AJAX call and then set the JavaScript window.location to this URL which will prompt the browser to download the file.
From the end users perspective, the file download operation is seamless as they never leave the page on which the request originates.
Below is a simple contrived example of an ajax call to achieve this:
$.ajax({
type: 'POST',
url: '/Reports/ExportMyData',
data: '{ "dataprop1": "test", "dataprop2" : "test2" }',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (returnValue) {
window.location = '/Reports/Download?file=' + returnValue;
}
});
url parameter is the Controller/Action method where your code will create the Excel file.
data parameter contains the json data that would be extracted from the form.
returnValue would be the file name of your newly created Excel file.
The window.location command redirects to the Controller/Action method that actually returns your file for download.
A sample controller method for the Download action would be:
[HttpGet]
public virtual ActionResult Download(string file)
{
string fullPath = Path.Combine(Server.MapPath("~/MyFiles"), file);
return File(fullPath, "application/vnd.ms-excel", file);
}
My 2 cents - you don't need to store the excel as a physical file on the server - instead, store it in the (Session) Cache. Use a uniquely generated name for your Cache variable (that stores that excel file) - this will be the return of your (initial) ajax call. This way you don't have to deal with file access issues, managing (deleting) the files when not needed, etc. and, having the file in the Cache, is faster to retrieve it.
I was recently able to accomplish this in MVC (although there was no need to use AJAX) without creating a physical file and thought I'd share my code:
Super simple JavaScript function (datatables.net button click triggers this):
function getWinnersExcel(drawingId) {
window.location = "/drawing/drawingwinnersexcel?drawingid=" + drawingId;
}
C# Controller code:
public FileResult DrawingWinnersExcel(int drawingId)
{
MemoryStream stream = new MemoryStream(); // cleaned up automatically by MVC
List<DrawingWinner> winnerList = DrawingDataAccess.GetWinners(drawingId); // simple entity framework-based data retrieval
ExportHelper.GetWinnersAsExcelMemoryStream(stream, winnerList, drawingId);
string suggestedFilename = string.Format("Drawing_{0}_Winners.xlsx", drawingId);
return File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml", suggestedFilename);
}
In the ExportHelper class I do use a 3rd party tool (GemBox.Spreadsheet) to generate the Excel file and it has a Save to Stream option. That being said, there are a number of ways to create Excel files that can easily be written to a memory stream.
public static class ExportHelper
{
internal static void GetWinnersAsExcelMemoryStream(MemoryStream stream, List<DrawingWinner> winnerList, int drawingId)
{
ExcelFile ef = new ExcelFile();
// lots of excel worksheet building/formatting code here ...
ef.SaveXlsx(stream);
stream.Position = 0; // reset for future read
}
}
In IE, Chrome, and Firefox, the browser prompts to download the file and no actual navigation occurs.
First Create the controller action that will create the Excel File
[HttpPost]
public JsonResult ExportExcel()
{
DataTable dt = DataService.GetData();
var fileName = "Excel_" + DateTime.Now.ToString("yyyyMMddHHmm") + ".xls";
//save the file to server temp folder
string fullPath = Path.Combine(Server.MapPath("~/temp"), fileName);
using (var exportData = new MemoryStream())
{
//I don't show the detail how to create the Excel, this is not the point of this article,
//I just use the NPOI for Excel handler
Utility.WriteDataTableToExcel(dt, ".xls", exportData);
FileStream file = new FileStream(fullPath, FileMode.Create, FileAccess.Write);
exportData.WriteTo(file);
file.Close();
}
var errorMessage = "you can return the errors in here!";
//return the Excel file name
return Json(new { fileName = fileName, errorMessage = "" });
}
then create the Download action
[HttpGet]
[DeleteFileAttribute] //Action Filter, it will auto delete the file after download,
//I will explain it later
public ActionResult Download(string file)
{
//get the temp folder and file path in server
string fullPath = Path.Combine(Server.MapPath("~/temp"), file);
//return the file for download, this is an Excel
//so I set the file content type to "application/vnd.ms-excel"
return File(fullPath, "application/vnd.ms-excel", file);
}
if you want to delete the file after downloaded create this
public class DeleteFileAttribute : ActionFilterAttribute
{
public override void OnResultExecuted(ResultExecutedContext filterContext)
{
filterContext.HttpContext.Response.Flush();
//convert the current filter context to file and get the file path
string filePath = (filterContext.Result as FilePathResult).FileName;
//delete the file after download
System.IO.File.Delete(filePath);
}
}
and finally ajax call from you MVC Razor view
//I use blockUI for loading...
$.blockUI({ message: '<h3>Please wait a moment...</h3>' });
$.ajax({
type: "POST",
url: '#Url.Action("ExportExcel","YourController")', //call your controller and action
contentType: "application/json; charset=utf-8",
dataType: "json",
}).done(function (data) {
//console.log(data.result);
$.unblockUI();
//get the file name for download
if (data.fileName != "") {
//use window.location.href for redirect to download action for download the file
window.location.href = "#Url.RouteUrl(new
{ Controller = "YourController", Action = "Download"})/?file=" + data.fileName;
}
});
I used the solution posted by CSL but I would recommend you dont store the file data in Session during the whole session. By using TempData the file data is automatically removed after the next request (which is the GET request for the file). You could also manage removal of the file data in Session in download action.
Session could consume much memory/space depending on SessionState storage and how many files are exported during the session and if you have many users.
I've updated the serer side code from CSL to use TempData instead.
public ActionResult PostReportPartial(ReportVM model){
// Validate the Model is correct and contains valid data
// Generate your report output based on the model parameters
// This can be an Excel, PDF, Word file - whatever you need.
// As an example lets assume we've generated an EPPlus ExcelPackage
ExcelPackage workbook = new ExcelPackage();
// Do something to populate your workbook
// Generate a new unique identifier against which the file can be stored
string handle = Guid.NewGuid().ToString()
using(MemoryStream memoryStream = new MemoryStream()){
workbook.SaveAs(memoryStream);
memoryStream.Position = 0;
TempData[handle] = memoryStream.ToArray();
}
// Note we are returning a filename as well as the handle
return new JsonResult() {
Data = new { FileGuid = handle, FileName = "TestReportOutput.xlsx" }
};
}
[HttpGet]
public virtual ActionResult Download(string fileGuid, string fileName)
{
if(TempData[fileGuid] != null){
byte[] data = TempData[fileGuid] as byte[];
return File(data, "application/vnd.ms-excel", fileName);
}
else{
// Problem - Log the error, generate a blank file,
// redirect to another controller action - whatever fits with your application
return new EmptyResult();
}
}
using ClosedXML.Excel;
public ActionResult Downloadexcel()
{
var Emplist = JsonConvert.SerializeObject(dbcontext.Employees.ToList());
DataTable dt11 = (DataTable)JsonConvert.DeserializeObject(Emplist, (typeof(DataTable)));
dt11.TableName = "Emptbl";
FileContentResult robj;
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(dt11);
using (MemoryStream stream = new MemoryStream())
{
wb.SaveAs(stream);
var bytesdata = File(stream.ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "myFileName.xlsx");
robj = bytesdata;
}
}
return Json(robj, JsonRequestBehavior.AllowGet);
}
$.ajax({
type: "GET",
url: "/Home/Downloadexcel/",
contentType: "application/json; charset=utf-8",
data: null,
success: function (Rdata) {
debugger;
var bytes = new Uint8Array(Rdata.FileContents);
var blob = new Blob([bytes], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = "myFileName.xlsx";
link.click();
},
error: function (err) {
}
});
The accepted answer didn't quite work for me as I got a 502 Bad Gateway result from the ajax call even though everything seemed to be returning fine from the controller.
Perhaps I was hitting a limit with TempData - not sure, but I found that if I used IMemoryCache instead of TempData, it worked fine, so here is my adapted version of the code in the accepted answer:
public ActionResult PostReportPartial(ReportVM model){
// Validate the Model is correct and contains valid data
// Generate your report output based on the model parameters
// This can be an Excel, PDF, Word file - whatever you need.
// As an example lets assume we've generated an EPPlus ExcelPackage
ExcelPackage workbook = new ExcelPackage();
// Do something to populate your workbook
// Generate a new unique identifier against which the file can be stored
string handle = Guid.NewGuid().ToString();
using(MemoryStream memoryStream = new MemoryStream()){
workbook.SaveAs(memoryStream);
memoryStream.Position = 0;
//TempData[handle] = memoryStream.ToArray();
//This is an equivalent to tempdata, but requires manual cleanup
_cache.Set(handle, memoryStream.ToArray(),
new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromMinutes(10)));
//(I'd recommend you revise the expiration specifics to suit your application)
}
// Note we are returning a filename as well as the handle
return new JsonResult() {
Data = new { FileGuid = handle, FileName = "TestReportOutput.xlsx" }
};
}
AJAX call remains as with the accepted answer (I made no changes):
$ajax({
cache: false,
url: '/Report/PostReportPartial',
data: _form.serialize(),
success: function (data){
var response = JSON.parse(data);
window.location = '/Report/Download?fileGuid=' + response.FileGuid
+ '&filename=' + response.FileName;
}
})
The controller action to handle the downloading of the file:
[HttpGet]
public virtual ActionResult Download(string fileGuid, string fileName)
{
if (_cache.Get<byte[]>(fileGuid) != null)
{
byte[] data = _cache.Get<byte[]>(fileGuid);
_cache.Remove(fileGuid); //cleanup here as we don't need it in cache anymore
return File(data, "application/vnd.ms-excel", fileName);
}
else
{
// Something has gone wrong...
return View("Error"); // or whatever/wherever you want to return the user
}
}
...
Now there is some extra code for setting up MemoryCache...
In order to use "_cache" I injected in the constructor for the controller like so:
using Microsoft.Extensions.Caching.Memory;
namespace MySolution.Project.Controllers
{
public class MyController : Controller
{
private readonly IMemoryCache _cache;
public LogController(IMemoryCache cache)
{
_cache = cache;
}
//rest of controller code here
}
}
And make sure you have the following in ConfigureServices in Startup.cs:
services.AddDistributedMemoryCache();
$.ajax({
global: false,
url: SitePath + "/User/ExportTeamMembersInExcel",
"data": { 'UserName': UserName, 'RoleId': RoleId, UserIds: AppraseeId },
"type": "POST",
"dataType": "JSON",
"success": function (result) {
var bytes = new Uint8Array(result.FileContents);
var blob = new Blob([bytes], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = "myFileName.xlsx";
link.click();
},
"error": function () {
alert("error");
}
})
[HttpPost]
public JsonResult ExportTeamMembersInExcel(string UserName, long? RoleId, string[] UserIds)
{
MemoryStream stream = new MemoryStream();
FileContentResult robj;
DataTable data = objuserservice.ExportTeamToExcel(UserName, RoleId, UserIds);
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(data, "TeamMembers");
using (stream)
{
wb.SaveAs(stream);
}
}
robj = File(stream.ToArray(), System.Net.Mime.MediaTypeNames.Application.Octet, "TeamMembers.xlsx");
return Json(robj, JsonRequestBehavior.AllowGet);
}
I may sound quite naive, and may attract quite a criticism, but here's how I did it,
(It doesn't involve ajax for export, but it doesn't do a full postback either )
Thanks for this post and this answer.
Create a simple controller
public class HomeController : Controller
{
/* A demo action
public ActionResult Index()
{
return View(model);
}
*/
[HttpPost]
public FileResult ExportData()
{
/* An example filter
var filter = TempData["filterKeys"] as MyFilter;
TempData.Keep(); */
var someList = db.GetDataFromDb(/*filter*/) // filter as an example
/*May be here's the trick, I'm setting my filter in TempData["filterKeys"]
in an action,(GetFilteredPartial() illustrated below) when 'searching' for the data,
so do not really need ajax here..to pass my filters.. */
//Some utility to convert list to Datatable
var dt = Utility.ConvertToDataTable(someList);
// I am using EPPlus nuget package
using (ExcelPackage pck = new ExcelPackage())
{
ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Sheet1");
ws.Cells["A1"].LoadFromDataTable(dt, true);
using (var memoryStream = new MemoryStream())
{
pck.SaveAs(memoryStream);
return File(memoryStream.ToArray(),
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
"ExportFileName.xlsx");
}
}
}
//This is just a supporting example to illustrate setting up filters ..
/* [HttpPost]
public PartialViewResult GetFilteredPartial(MyFilter filter)
{
TempData["filterKeys"] = filter;
var filteredData = db.GetConcernedData(filter);
var model = new MainViewModel();
model.PartialViewModel = filteredData;
return PartialView("_SomePartialView", model);
} */
}
And here are the Views..
/*Commenting out the View code, in order to focus on the imp. code
#model Models.MainViewModel
#{Layout...}
Some code for, say, a partial View
<div id="tblSampleBody">
#Html.Partial("_SomePartialView", Model.PartialViewModel)
</div>
*/
//The actual part.. Just **posting** this bit of data from the complete View...
//Here, you are not posting the full Form..or the complete View
#using (Html.BeginForm("ExportData", "Home", FormMethod.Post))
{
<input type="submit" value="Export Data" />
}
//...
//</div>
/*And you may require to pass search/filter values.. as said in the accepted answer..
That can be done while 'searching' the data.. and not while
we need an export..for instance:-
<script>
var filterData = {
SkipCount: someValue,
TakeCount: 20,
UserName: $("#UserName").val(),
DepartmentId: $("#DepartmentId").val(),
}
function GetFilteredData() {
$("#loader").show();
filterData.SkipCount = 0;
$.ajax({
url: '#Url.Action("GetFilteredPartial","Home")',
type: 'POST',
dataType: "html",
data: filterData,
success: function (dataHTML) {
if ((dataHTML === null) || (dataHTML == "")) {
$("#tblSampleBody").html('<tr><td>No Data Returned</td></tr>');
$("#loader").hide();
} else {
$("#tblSampleBody").html(dataHTML);
$("#loader").hide();
}
}
});
}
</script>*/
The whole point of the trick seems that, we are posting a form (a part of the Razor View ) upon which we are calling an Action method, which returns: a FileResult, and this FileResult returns the Excel File..
And for posting the filter values, as said, ( and if you require to), I am making a post request to another action, as has been attempted to describe..
This thread helped me create my own solution that I will share here. I was using a GET ajax request at first without issues but it got to a point where the request URL length was exceeded so I had to swith to a POST.
The javascript uses JQuery file download plugin and consists of 2 succeeding calls. One POST (To send params) and one GET to retreive the file.
function download(result) {
$.fileDownload(uri + "?guid=" + result,
{
successCallback: onSuccess.bind(this),
failCallback: onFail.bind(this)
});
}
var uri = BASE_EXPORT_METADATA_URL;
var data = createExportationData.call(this);
$.ajax({
url: uri,
type: 'POST',
contentType: 'application/json',
data: JSON.stringify(data),
success: download.bind(this),
fail: onFail.bind(this)
});
Server side
[HttpPost]
public string MassExportDocuments(MassExportDocumentsInput input)
{
// Save query for file download use
var guid = Guid.NewGuid();
HttpContext.Current.Cache.Insert(guid.ToString(), input, null, DateTime.Now.AddMinutes(5), Cache.NoSlidingExpiration);
return guid.ToString();
}
[HttpGet]
public async Task<HttpResponseMessage> MassExportDocuments([FromUri] Guid guid)
{
//Get params from cache, generate and return
var model = (MassExportDocumentsInput)HttpContext.Current.Cache[guid.ToString()];
..... // Document generation
// to determine when file is downloaded
HttpContext.Current
.Response
.SetCookie(new HttpCookie("fileDownload", "true") { Path = "/" });
return FileResult(memoryStream, "documents.zip", "application/zip");
}
CSL's answer was implemented in a project I'm working on but the problem I incurred was scaling out on Azure broke our file downloads. Instead, I was able to do this with one AJAX call:
SERVER
[HttpPost]
public FileResult DownloadInvoice(int id1, int id2)
{
//necessary to get the filename in the success of the ajax callback
HttpContext.Response.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");
byte[] fileBytes = _service.GetInvoice(id1, id2);
string fileName = "Invoice.xlsx";
return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, fileName);
}
CLIENT
(modified version of Handle file download from ajax post)
$("#downloadInvoice").on("click", function() {
$("#loaderInvoice").removeClass("d-none");
var xhr = new XMLHttpRequest();
var params = [];
xhr.open('POST', "#Html.Raw(Url.Action("DownloadInvoice", "Controller", new { id1 = Model.Id1, id2 = Model.Id2 }))", true);
xhr.responseType = 'arraybuffer';
xhr.onload = function () {
if (this.status === 200) {
var filename = "";
var disposition = xhr.getResponseHeader('Content-Disposition');
if (disposition && disposition.indexOf('attachment') !== -1) {
var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
var matches = filenameRegex.exec(disposition);
if (matches != null && matches[1]) filename = matches[1].replace(/['"]/g, '');
}
var type = xhr.getResponseHeader('Content-Type');
var blob = typeof File === 'function'
? new File([this.response], filename, { type: type })
: new Blob([this.response], { type: type });
if (typeof window.navigator.msSaveBlob !== 'undefined') {
// IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed."
window.navigator.msSaveBlob(blob, filename);
} else {
var URL = window.URL || window.webkitURL;
var downloadUrl = URL.createObjectURL(blob);
if (filename) {
// use HTML5 a[download] attribute to specify filename
var a = document.createElement("a");
// safari doesn't support this yet
if (typeof a.download === 'undefined') {
window.location = downloadUrl;
} else {
a.href = downloadUrl;
a.download = filename;
document.body.appendChild(a);
a.click();
}
} else {
window.location = downloadUrl;
}
setTimeout(function() {
URL.revokeObjectURL(downloadUrl);
$("#loaderInvoice").addClass("d-none");
}, 100); // cleanup
}
}
};
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xhr.send($.param(params));
});
This works for me. Make sure you return a File from your controller action with contentType as "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" and file name as e.g. "List.xlsx" which should be the same as in the AJAX success call. I have used ClosedXML NuGet package to generate the excel file.
$.ajax({
url: "Home/Export",
type: 'GET',
contentType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
xhrFields: { responseType: 'blob' },
success: function (data) {
var a = document.createElement('a');
var url = window.URL.createObjectURL(data);
a.href = url;
a.download = 'List.xlsx';
a.click();
window.URL.revokeObjectURL(url);
}
});
I am using Asp.Net WebForm and just I wanna to download a file from server side. There is a lot article but I cannot find just basic answer.
Now, I tried a basic way and got it.
That's my problem.
I have to create a lot of input button dynamically on runtime. And I want to add each button to download button with giving an unique fileNumber.
I create each button like this:
fragment += "<div><input type=\"button\" value=\"Create Excel\" onclick=\"CreateExcelFile(" + fileNumber + ");\" /></div>";
Each button call this ajax method.
$.ajax({
type: 'POST',
url: 'index.aspx/CreateExcelFile',
data: jsonData,
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (returnValue) {
window.location = '/Reports/Downloads/' + returnValue.d;
}
});
Then I wrote a basic simple method.
[WebMethod]
public static string CreateExcelFile2(string fileNumber)
{
string filePath = string.Format(#"Form_{0}.xlsx", fileNumber);
return filePath;
}
I am generating this Form_1, Form_2, Form_3.... And I am going to delete this old files with another program. But if there is a way to just sending byte array to download file like using Response. I wanna to use it.
I hope this will be usefull for anyone.
On Submit form
public ActionResult ExportXls()
{
var filePath="";
CommonHelper.WriteXls(filePath, "Text.xls");
}
public static void WriteXls(string filePath, string targetFileName)
{
if (!String.IsNullOrEmpty(filePath))
{
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.Charset = "utf-8";
response.ContentType = "text/xls";
response.AddHeader("content-disposition", string.Format("attachment; filename={0}", targetFileName));
response.BinaryWrite(File.ReadAllBytes(filePath));
response.End();
}
}
I need to post the from Property name and values to the Mvc web api Controller without using model Property because i need to use same Ajax call (method) for different Forms also.
Using this Ajax Method i need to Post values i am Posting values but how i need to receive those values in Controller
Example Of Posting:
function Add(){var model = $("#Enquiry").serialize();
$.ajax({
url: 'http://localhost:60533/api/Enquiry',
type: 'POST',
dataType: 'json',
data: model,
success: function (data) {
console.log(data);
}
});}
Using Below Controller how can i Receive model Values without using C# (Get set Property) Model?
public HttpResponseMessage Post(object model)
{
var Result = (new EnquiryDtl().Post(model));
return Request.CreateResponse(HttpStatusCode.OK);
}
This is how I do it...
var dataArray = $("#Enquiry").serializeArray(),
var model = {};
for (i = 0; i < dataArray.length; i++)
model[dataArray[i].name] = dataArray[i].value;
var url = 'http://localhost:60533/api/Enquiry';
$.ajax({
url: url, type: "POST", dataType: 'json',
data: JSON.stringify(model), contentType: 'application/json',
success: function (data) {
....
}
});
and in the controller:
public HttpResponseMessage Post(Dictionary<string, string> fields)
{
...
}
As you've undoubtedly discovered, object doesn't have a lot of useful properties on it. This is where using a model really comes in handy. For example, let's say you're posting an integer called ID and a string called Name, then this simple object would be populated accordingly:
public class MyModel
{
public int ID { get; set; }
public string Name { get; set; }
}
And you'd use it in your method:
public HttpResponseMessage Post(MyModel model)
{
// here you can access model.ID and model.Name
}
If you really don't want to use a model, you can include the values directly in the method signature:
public HttpResponseMessage Post(int id, string name)
{
// here you can access id and name
}
Of course, using a model brings a lot more advantages. Specifically, you can add business logic to the model (since business logic belongs on the models and not on the controllers). Additional benefits include being able to modify the structure without having to modify all consuming code. (For example, if you have multiple methods which accept this structure then you'd have to change all of them to add a new field. With a model, you'd only have to change that one model.)
Finally I got the Solution To send the Key Pair values to the Mvc Controller using Ajax and web Api.
Without using C# Model get set property
My Script:
function Enquiry() {
var dataArray = $("#formMember").serializeArray(),
model = {};
for (i = 0; i < dataArray.length; i++) {
var Name = "["+i+"]"+""+"."+"Key";
var Value = "[" + i + "]" + "" + "." + "Value"
model[Name] = dataArray[i].name;
model[Value] = dataArray[i].value;
}
$.ajax({
url: 'http://localhost:60533/api/Enquiry',
type: 'POST',
data: model,
success: function (data) {
alert(data);
}
});}
C# Code
I am reciving Those values Instead of Object I am Using Dictionary
public HttpResponseMessage Post(Dictionary<string, string> dictionary)
{
var Result = (new EnquiryDtl().Post(dictionary));
return Request.CreateResponse(HttpStatusCode.OK);
}
In my View I have:
$.ajax({
url: '/Profile/TryToGetPersonalInfo',
type: 'post',
success: function (outData) {
if (outData.loggedIn == true) {
$('#PersonalInfoData').load(outData.data);
}
}
});
And in my Controller I have:
[HttpGet]
private ActionResult PersonalInfo()
{
return PartialView();
}
[HttpPost]
public JsonResult TryToGetPersonalInfo()
{
// loggedIn is temporary
return Json( new { loggedIn = true, data = this.PersonalInfo() } );
}
How come .load() doesn't do the job? I have also tried .html(), but still, no luck.
Please note that I really want to keep this form (having ProfileInfo() as private), and TryToGetProfileInfo() as post, cause I'm using validation tokens.
You are returning a Json object. You need to return html. In similar cases, I declare the action return type as an ActionResult and return a partial view.
I have validated the JSON response from my C# Webmethod, so I don't believe that's the problem.
Am trying to parse the result using simple jQuery $.ajax, but for whatever reason I can't get the method to correctly fire and parse the result, also incidentally can't seem to get the function to fire the result. Are their any limits on the size of the JSON object that can be returned.
I also removed this code from inside a "Site.Master" page because it would always refresh when I hit the simple button. Do tags work correctly with jQuery elements like the button input I'm grabbing from the DOM?
function ajax() {
//var myData = { qtype: "ProductName", query: "xbox" };
var myData = { "request": { qtype: "ProductName", query: "xbox"} };
$.ajax({
type: "POST",
url: "/webservice/WebService.asmx/updateProductsList",
data: {InputData:$.toJSON(myData)},
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (msg) {
// var msg = {__type: "Testportal.outputData", id: "li1234", message: "it's work!", myInt:101}
alert("message=" + msg.d.ProductName + ", id=" + msg.d.Brand);
},
error: function (res, status) {
if (status === "error") {
// errorMessage can be an object with 3 string properties: ExceptionType, Message and StackTrace
var errorMessage = $.parseJSON(res.responseText);
alert(errorMessage.Message);
}
}
});
}
And the page:
<asp:Button ID="Button1" runat="server" OnClientClick="ajax();" Text="Button" />
And the Serverside Webmethod:
public class WebService : System.Web.Services.WebService
{
[WebMethod]
[ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
public OutputData updateProductsList(InputData request)
{
OutputData result = new OutputData();
var db = new App_Data.eCostDataContext();
var q = from c in db.eCosts
select c;
if (!string.IsNullOrEmpty(request.qtype) && !string.IsNullOrEmpty(request.query))
{
q = q.Like(request.qtype, request.query);
}
//q = q.Skip((page - 1) * rp).Take(rp);
result.products = q.ToList();
searchObject search = new searchObject();
foreach (App_Data.eCost product in result.products)
{
/* create new item list */
searchResult elements = new searchResult()
{
id = product.ProductID,
elements = GetPropertyList(product)
};
search.items.Add(elements);
}
return result;
}
And helper classes:
public class OutputData
{
public string id { get; set; }
public List<App_Data.eCost> products { get; set; }
}
public class InputData
{
public string qtype { get; set; }
public string query { get; set; }
}
One problem you may be having is that you aren't doing anything to prevent the button from submitting the form and executing a full postback/reload at the same time you're starting your $.ajax() callback.
I'd suggest wiring this up unobtrusively instead of using the OnClientClick property, like this:
$(document).ready(function() {
// May need to use $('<%= Button1.ClientID %>') if your Button is
// inside a naming container, such as a master page.
$('#Button1').click(function(evt) {
// This stops the form submission.
evt.preventDefault();
$.ajax({
// Your $.ajax() code here.
});
});
});
I also agree with Oleg that you should use json2.js for your JSON stringifying and parsing. In newer browsers, that will fall back to the browsers' native implementations of those methods, which is much faster and makes the parsing safer.
Update:
To answer your question about the data, no that doesn't look quite right.
What you want to ultimately send to the server is this (sans formatting):
{"request":{"gtype":"ProductName","query":"xbox"}}
To accomplish that, you want something like this:
var req = { request : { qtype: "ProductName", query: "xbox" }};
$.ajax({
data: JSON.stringify(req),
// Remaining $.ajax() parameters
});
Keep in mind that request, qtype, and query must match your server-side structure with case-sensitive accuracy.
You can also be more verbose in defining the request object (which I prefer, personally, to keep things clear and readable):
var req = { };
req.request = { };
req.request.qtype = "ProductName";
req.request.query = "xbox";
I've written a bit more about this here, if you're interested: http://encosia.com/2009/04/07/using-complex-types-to-make-calling-services-less-complex/
What does your server side code method look like? Set a break point. Is it even being hit?
It should look something like:
[WebMethod, ScriptMethod]
public string updateProductsList(string qtype, string query)
{ // stuff
}
Also, your javascript data params do not look formatted correctly.
It seems to me that your problem is that you try to use manual JSON serialization. There are more direct way. You should just declare [ScriptMethod (ResponseFormat = ResponseFormat.Json)] or [ScriptMethod (UseHttpGet = true, ResponseFormat = ResponseFormat.Json)] and return return direct an object instead of the string from the web method. On the client side (in JavaScript) I strictly recommend you to use JSON.stringify (from json2.js which can be downloaded from http://www.json.org/js.html) for the constructing of the data parameter of jQuery.ajax.
Look at Can I return JSON from an .asmx Web Service if the ContentType is not JSON? and How do I build a JSON object to send to an AJAX WebService? probably also in JQuery ajax call to httpget webmethod (c#) not working you have have an interest for more experiments.