Blueimp jQuery File Upload not compatible with ASP.NET Core 3.1
I am trying to integrate the Blueimp jQuery File upload in ASP.NET Core 3.1 but it has become incompatible with this version (3.1).
The reason why I am saying is because I have tested the same code with ASP.NET Core 2.0 where Blueimp works perfectly. The below are the 2 videos to prove this fact.
ASP.NET Core 2.0 which works perfectly
ASP.NET Core 3.1 which gives error
The Controller's code in ASP.NET Core 3.1
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using jFileUpload.Models;
using Newtonsoft.Json;
namespace jFileUpload.Controllers
{
public class HomeController : Controller
{
private IWebHostEnvironment hostingEnvironment;
public HomeController(IWebHostEnvironment environment)
{
hostingEnvironment = environment;
}
public IActionResult Index()
{
return View();
}
public IActionResult Upload()
{
return View("Index");
}
[HttpPost]
public async Task<JsonFiles> Upload(IFormFile files)
{
var resultList = new List<UploadFilesResult>();
string path = Path.Combine(hostingEnvironment.WebRootPath, "uploads/" + files.FileName);
using (var stream = new FileStream(path, FileMode.Create))
{
await files.CopyToAsync(stream);
}
UploadFilesResult uploadFiles = new UploadFilesResult();
uploadFiles.name = files.FileName;
uploadFiles.size = files.Length;
uploadFiles.type = "image/jpeg";
uploadFiles.url = "/uploads/" + files.FileName;
uploadFiles.deleteUrl = "/Home/Delete?file=" + files.FileName;
uploadFiles.thumbnailUrl = "/uploads/" + files.FileName;
uploadFiles.deleteType = "GET";
resultList.Add(uploadFiles);
JsonFiles jFiles = new JsonFiles(resultList);
string output = JsonConvert.SerializeObject(jFiles);
return jFiles;
}
public JsonResult Delete(string file)
{
System.IO.File.Delete(Path.Combine(hostingEnvironment.WebRootPath, "uploads/" + file));
return Json("OK");
}
}
}
In ASP.NET Core 2.0 the controllers code is slightly different on the Dependency Injection part which is given below, rest all is same.
private IHostingEnvironment hostingEnvironment;
public HomeController(IHostingEnvironment environment)
{
hostingEnvironment = environment;
}
The Model classes
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace jFileUpload.Models
{
public class UploadFilesResult
{
public string name { get; set; }
public long size { get; set; }
public string type { get; set; }
public string url { get; set; }
public string deleteUrl { get; set; }
public string thumbnailUrl { get; set; }
public string deleteType { get; set; }
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace jFileUpload.Models
{
public class JsonFiles
{
public UploadFilesResult[] files;
public string TempFolder { get; set; }
public JsonFiles(List<UploadFilesResult> filesList)
{
files = new UploadFilesResult[filesList.Count];
for (int i = 0; i < filesList.Count; i++)
{
files[i] = filesList.ElementAt(i);
}
}
}
}
The View code
@{
Layout = null;
}
<!DOCTYPE html>
<!--
/*
* jQuery File Upload Demo
* https://github.com/blueimp/jQuery-File-Upload
*
* Copyright 2010, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* https://opensource.org/licenses/MIT
*/
-->
<html lang="en">
<head>
<!-- Force latest IE rendering engine or ChromeFrame if installed -->
<!--[if IE]>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<![endif]-->
<meta charset="utf-8" />
<title>jQuery File Upload Demo</title>
<meta name="description"
content="File Upload widget with multiple file selection, drag&drop support, progress bars, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads and client-side image resizing. Works with any server-side platform (PHP, Python, Ruby on Rails, Java, Node.js, Go etc.) that supports standard HTML form file uploads." />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<!-- Bootstrap styles -->
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
crossorigin="anonymous" />
<!-- Generic page styles -->
<style>
#navigation {
margin: 10px 0;
}
@@media (max-width: 767px) {
#title,
#description {
display: none;
}
}
</style>
<!-- blueimp Gallery styles -->
<link rel="stylesheet"
href="https://blueimp.github.io/Gallery/css/blueimp-gallery.min.css" />
<!-- CSS to style the file input field as button and adjust the Bootstrap progress bars -->
<link rel="stylesheet" href="~/css/jquery.fileupload.css" />
<link rel="stylesheet" href="~/css/jquery.fileupload-ui.css" />
<!-- CSS adjustments for browsers with JavaScript disabled -->
<noscript>
<link rel="stylesheet" href="~/css/jquery.fileupload-noscript.css" />
</noscript>
<noscript>
<link rel="stylesheet" href="~/css/jquery.fileupload-ui-noscript.css" />
</noscript>
</head>
<body>
<div class="container">
<ul class="nav nav-tabs" id="navigation">
<li>
<a href="https://github.com/blueimp/jQuery-File-Upload">Project</a>
</li>
<li class="active">
<a href="#">Demo</a>
</li>
<li>
<a href="https://github.com/blueimp/jQuery-File-Upload/wiki">Wiki</a>
</li>
<li>
<a href="https://blueimp.net">Author</a>
</li>
</ul>
<h1 id="title">jQuery File Upload Demo</h1>
<blockquote id="description">
<p>
File Upload widget with multiple file selection, drag&drop
support, progress bars, validation and preview images, audio and video
for jQuery.<br />
Supports cross-domain, chunked and resumable file uploads and
client-side image resizing.<br />
Works with any server-side platform (PHP, Python, Ruby on Rails, Java,
Node.js, Go etc.) that supports standard HTML form file uploads.
</p>
</blockquote>
<!-- The file upload form used as target for the file upload widget -->
<form id="fileupload"
action="https://jquery-file-upload.appspot.com/"
method="POST"
enctype="multipart/form-data">
<!-- Redirect browsers with JavaScript disabled to the origin page -->
<noscript>
<input type="hidden"
name="redirect"
value="https://blueimp.github.io/jQuery-File-Upload/" />
</noscript>
<!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
<div class="row fileupload-buttonbar">
<div class="col-lg-7">
<!-- The fileinput-button span is used to style the file input field as button -->
<span class="btn btn-success fileinput-button">
<i class="glyphicon glyphicon-plus"></i>
<span>Add files...</span>
<input type="file" name="files" multiple />
</span>
<button type="submit" class="btn btn-primary start">
<i class="glyphicon glyphicon-upload"></i>
<span>Start upload</span>
</button>
<button type="reset" class="btn btn-warning cancel">
<i class="glyphicon glyphicon-ban-circle"></i>
<span>Cancel upload</span>
</button>
<button type="button" class="btn btn-danger delete">
<i class="glyphicon glyphicon-trash"></i>
<span>Delete selected</span>
</button>
<input type="checkbox" class="toggle" />
<!-- The global file processing state -->
<span class="fileupload-process"></span>
</div>
<!-- The global progress state -->
<div class="col-lg-5 fileupload-progress fade">
<!-- The global progress bar -->
<div class="progress progress-striped active"
role="progressbar"
aria-valuemin="0"
aria-valuemax="100">
<div class="progress-bar progress-bar-success"
style="width: 0%;"></div>
</div>
<!-- The extended global progress state -->
<div class="progress-extended"> </div>
</div>
</div>
<!-- The table listing the files available for upload/download -->
<table role="presentation" class="table table-striped">
<tbody class="files"></tbody>
</table>
</form>
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">Demo Notes</h3>
</div>
<div class="panel-body">
<ul>
<li>
The maximum file size for uploads in this demo is
<strong>999 KB</strong> (default file size is unlimited).
</li>
<li>
Only image files (<strong>JPG, GIF, PNG</strong>) are allowed in
this demo (by default there is no file type restriction).
</li>
<li>
Uploaded files will be deleted automatically after
<strong>5 minutes or less</strong> (demo files are stored in
memory).
</li>
<li>
You can <strong>drag & drop</strong> files from your desktop
on this webpage (see
<a href="https://github.com/blueimp/jQuery-File-Upload/wiki/Browser-support">Browser support</a>).
</li>
<li>
Please refer to the
<a href="https://github.com/blueimp/jQuery-File-Upload">project website</a>
and
<a href="https://github.com/blueimp/jQuery-File-Upload/wiki">documentation</a>
for more information.
</li>
<li>
Built with the
<a href="https://getbootstrap.com/">Bootstrap</a> CSS framework
and Icons from <a href="https://glyphicons.com/">Glyphicons</a>.
</li>
</ul>
</div>
</div>
</div>
<!-- The blueimp Gallery widget -->
<div id="blueimp-gallery"
class="blueimp-gallery blueimp-gallery-controls"
aria-label="image gallery"
aria-modal="true"
role="dialog"
data-filter=":even">
<div class="slides" aria-live="polite"></div>
<h3 class="title"></h3>
<a class="prev"
aria-controls="blueimp-gallery"
aria-label="previous slide"
aria-keyshortcuts="ArrowLeft"></a>
<a class="next"
aria-controls="blueimp-gallery"
aria-label="next slide"
aria-keyshortcuts="ArrowRight"></a>
<a class="close"
aria-controls="blueimp-gallery"
aria-label="close"
aria-keyshortcuts="Escape"></a>
<a class="play-pause"
aria-controls="blueimp-gallery"
aria-label="play slideshow"
aria-keyshortcuts="Space"
aria-pressed="false"
role="button"></a>
<ol class="indicator"></ol>
</div>
<!-- The template to display files available for upload -->
<script id="template-upload" type="text/x-tmpl">
{% for (var i=0, file; file=o.files[i]; i++) { %}
<tr class="template-upload fade{%=o.options.loadImageFileTypes.test(file.type)?' image':''%}">
<td>
<span class="preview"></span>
</td>
<td>
<p class="name">{%=file.name%}</p>
<strong class="error text-danger"></strong>
</td>
<td>
<p class="size">Processing...</p>
<div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><div class="progress-bar progress-bar-success" style="width:0%;"></div></div>
</td>
<td>
{% if (!o.options.autoUpload && o.options.edit && o.options.loadImageFileTypes.test(file.type)) { %}
<button class="btn btn-success edit" data-index="{%=i%}" disabled>
<i class="glyphicon glyphicon-edit"></i>
<span>Edit</span>
</button>
{% } %}
{% if (!i && !o.options.autoUpload) { %}
<button class="btn btn-primary start" disabled>
<i class="glyphicon glyphicon-upload"></i>
<span>Start</span>
</button>
{% } %}
{% if (!i) { %}
<button class="btn btn-warning cancel">
<i class="glyphicon glyphicon-ban-circle"></i>
<span>Cancel</span>
</button>
{% } %}
</td>
</tr>
{% } %}
</script>
<!-- The template to display files available for download -->
<script id="template-download" type="text/x-tmpl">
{% for (var i=0, file; file=o.files[i]; i++) { %}
<tr class="template-download fade{%=file.thumbnailUrl?' image':''%}">
<td>
<span class="preview">
{% if (file.thumbnailUrl) { %}
<a href="{%=file.url%}" title="{%=file.name%}" download="{%=file.name%}" data-gallery><img src="{%=file.thumbnailUrl%}"></a>
{% } %}
</span>
</td>
<td>
<p class="name">
{% if (file.url) { %}
<a href="{%=file.url%}" title="{%=file.name%}" download="{%=file.name%}" {%=file.thumbnailUrl?'data-gallery':''%}>{%=file.name%}</a>
{% } else { %}
<span>{%=file.name%}</span>
{% } %}
</p>
{% if (file.error) { %}
<div><span class="label label-danger">Error</span> {%=file.error%}</div>
{% } %}
</td>
<td>
<span class="size">{%=o.formatFileSize(file.size)%}</span>
</td>
<td>
{% if (file.deleteUrl) { %}
<button class="btn btn-danger delete" data-type="{%=file.deleteType%}" data-url="{%=file.deleteUrl%}" {% if (file.deleteWithCredentials) { %} data-xhr-fields='{"withCredentials":true}' {% } %}>
<i class="glyphicon glyphicon-trash"></i>
<span>Delete</span>
</button>
<input type="checkbox" name="delete" value="1" class="toggle">
{% } else { %}
<button class="btn btn-warning cancel">
<i class="glyphicon glyphicon-ban-circle"></i>
<span>Cancel</span>
</button>
{% } %}
</td>
</tr>
{% } %}
</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"
integrity="sha384-nvAa0+6Qg9clwYCGGPpDQLVpLNn0fRaROjHqs13t4Ggj3Ez50XnGQqc/r8MhnRDZ"
crossorigin="anonymous"></script>
<!-- The jQuery UI widget factory, can be omitted if jQuery UI is already included -->
<script src="~/js/vendor/jquery.ui.widget.js"></script>
<!-- The Templates plugin is included to render the upload/download listings -->
<script src="https://blueimp.github.io/JavaScript-Templates/js/tmpl.min.js"></script>
<!-- The Load Image plugin is included for the preview images and image resizing functionality -->
<script src="https://blueimp.github.io/JavaScript-Load-Image/js/load-image.all.min.js"></script>
<!-- The Canvas to Blob plugin is included for image resizing functionality -->
<script src="https://blueimp.github.io/JavaScript-Canvas-to-Blob/js/canvas-to-blob.min.js"></script>
<!-- blueimp Gallery script -->
<script src="https://blueimp.github.io/Gallery/js/jquery.blueimp-gallery.min.js"></script>
<!-- The Iframe Transport is required for browsers without support for XHR file uploads -->
<script src="~/js/jquery.iframe-transport.js"></script>
<!-- The basic File Upload plugin -->
<script src="~/js/jquery.fileupload.js"></script>
<!-- The File Upload processing plugin -->
<script src="~/js/jquery.fileupload-process.js"></script>
<!-- The File Upload image preview & resize plugin -->
<script src="~/js/jquery.fileupload-image.js"></script>
<!-- The File Upload audio preview plugin -->
<script src="~/js/jquery.fileupload-audio.js"></script>
<!-- The File Upload video preview plugin -->
<script src="~/js/jquery.fileupload-video.js"></script>
<!-- The File Upload validation plugin -->
<script src="~/js/jquery.fileupload-validate.js"></script>
<!-- The File Upload user interface plugin -->
<script src="~/js/jquery.fileupload-ui.js"></script>
<!-- The main application script -->
<script src="~/js/demo.js"></script>
<!-- The XDomainRequest Transport is included for cross-domain file deletion for IE 8 and IE 9 -->
<!--[if (gte IE 8)&(lt IE 10)]>
<script src="~/js/cors/jquery.xdr-transport.js"></script>
<![endif]-->
</body>
</html>
When I run the ASP.NET Core 3.1 I get the error -
- "Empty file upload result"
Why it is so ?. Please help. Thank you.
Solution
It seems to be that with ASP.Net Core 3, there looks like there is a change in how the value needs to be sent back to the upload function.
[HttpPost]
public async Task<JsonResult> Upload(IFormFile files)
{
var resultList = new List<UploadFilesResult>();
.
.
//Your code
.
.
resultList.Add(uploadFiles);
//This is the new change, the new format which you have to send the data back as.
return Json(new { files = resultList });
}
The script portion of the Upload will remain the same. I used your code in your website and this change worked fine with your solution too.
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