jQuery Upload Images (Files) without Postback or Page Refresh in Asp.net

By: Suresh Dasari Feb 2, 2015

Introduction:

Here I will explain how to upload images or files using jQuery without page refresh or postback in asp.net using handler (ashx) in c#, vb.net or jQuery upload files or images without postback in asp.net using Handler in c#, vb.net or asynchronous file upload using jQuery without submitting form in asp.net with c#, vb.net.

Description:

In previous articles I explained jQuery call asp.net page methods from json, 7 + jQuery multiple fileupload plugin examples, jQuery check file size before upload in asp.net, jQuery setInterval() function example, jQuery upload multiple files using uplodify plugin in asp.net and many articles relating to jQuery, JavaScript and asp.net. Now I will explain how to upload images or files using jQuery without page refresh or postback in asp.net using handler (ashx) in c#, vb.net.

To upload images or files using jQuery without page refresh or postback in asp.net using handler (ashx) first create the new web application and open Default.aspx page and write the following code

<title>uploading file using jquery with generic handler ashx</title>

$(function () {

$('#btnUpload').click(function () {

var fileUpload = $("#FileUpload1").get(0);

var files = fileUpload.files;

var test = new FormData();

for (var i = 0; i < files.length; i++) {

test.append(files[i].name, files[i]);

}

$.ajax({

url: "UploadHandler.ashx",

type: "POST",

contentType: false,

processData: false,

data: test,

// dataType: "json",

success: function (result) {

alert(result);

},

error: function (err) {

alert(err.statusText);

}

});

})

</script>

</head>

<body>

<div>

</div>

</form>

</body>

</html>

If you observe jQuery ajax method in above code we mentioned “UploadHandler.ashx” by using this file we will upload files in server side. Now add handler file in your application by following below steps

Right click on your application à select Add New Item à select Generic Handler file à Give a name and click Add button like as shown below

Once you finished adding handler file now add new folder in your application “uploads” that would be like as shown below

Now open UploadHandler.ashx file and write the following code

C# Code

<%@ WebHandler Language="C#" Class="UploadHandler" %>

using System;

using System.Web;

using System.IO;

public class UploadHandler : IHttpHandler {

public void ProcessRequest (HttpContext context) {

if (context.Request.Files.Count > 0)

{

HttpFileCollection files = context.Request.Files;

for (int i = 0; i < files.Count; i++)

{

HttpPostedFile file = files[i];

string fname;

if (HttpContext.Current.Request.Browser.Browser.ToUpper() == "IE" || HttpContext.Current.Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER")

{

string[] testfiles = file.FileName.Split(new char[] { '\\' });

fname = testfiles[testfiles.Length - 1];

}

else

{

fname = file.FileName;

}

fname=Path.Combine(context.Server.MapPath("~/uploads/"), fname);

file.SaveAs(fname);

}

context.Response.ContentType = "text/plain";

context.Response.Write("File Uploaded Successfully!");

}

public bool IsReusable {

get {

return false;

}

VB.NET Code

<%@ WebHandler Language="VB" Class="Handler" %>

Imports System.Web

Imports System.IO

Public Class Handler : Implements IHttpHandler

Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

If context.Request.Files.Count > 0 Then

Dim files As HttpFileCollection = context.Request.Files

For i As Integer = 0 To files.Count - 1

Dim file As HttpPostedFile = files(i)

Dim fname As String

If HttpContext.Current.Request.Browser.Browser.ToUpper() = "IE" OrElse HttpContext.Current.Request.Browser.Browser.ToUpper() = "INTERNETEXPLORER" Then

Dim testfiles As String() = file.FileName.Split(New Char() {"\"c})

fname = testfiles(testfiles.Length - 1)

Else

fname = file.FileName

End If

fname = Path.Combine(context.Server.MapPath("~/uploads/"), fname)

file.SaveAs(fname)

context.Response.ContentType = "text/plain"

context.Response.Write("File Uploaded Successfully!")

End Sub

Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable

Get

Return False

End Get

End Property

End Class

Now run your application that will allow you to upload files in upload folder using handler files.

Demo

Download Sample Attached

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8 comments :

Anonymous said...: Hi Suresh,

Thanks for the nice writeup. What is the largest file size can this approach support?

-Ravi.; March 25, 2015 at 6:38 AM
Nityanand Yadav said...: Hi Suresh , it is woking fine in chrome but not in IE . what to do .
thanks; May 3, 2015 at 12:01 PM
karthik said...: Hi Suresh , it is not working in content page, what should i do?; July 8, 2015 at 7:58 AM
Alen said...: Thanks for posting this and making source code available.; July 10, 2015 at 5:34 AM
Anonymous said...: Hi, what is var test = new FormData(); i've error in FormData(), not find this function.; July 26, 2016 at 8:04 AM
Unknown said...: It's working fine inIE also; April 19, 2017 at 9:01 PM
Anonymous said...: Showing 'Internal Server Error' while using it on IIS; August 10, 2017 at 4:40 AM
codepursuit said...: Very helpful!
Thank you so much!
Can you please publish the download code also using json.
Thanks in advnace!; January 3, 2018 at 6:19 AM

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