Tips for uploading files in asp.net using an ajax call

Question

Tips for uploading files in asp.net using an ajax call

I have developed a small asp.net web forms application for managing emails. The interface allows users to input mandatory information such as sender, recipient, and subject. I am now looking to implement file attachments in the emails using the asp.net file upload controller to upload multiple files.

https://i.sstatic.net/MGCzC.png

To send this data to the server-side code behind without refreshing the page, I have decided to utilize AJAX calls. However, I am facing challenges with sending the attached files along with the form data. After researching, I discovered that I need to use FormData to properly handle file uploads. I have created a FormData object and appended the attached files to it, but I am unsure of how to pass this object to the server-side code.

function sendEmail() {

    var data = new FormData();
    var files = $('.attachment');
    $.each(files, function (key, value) {
        var file = $(value).data('file');
        data.append(file.name, file);
    });

    $.ajax({
        url: "OpenJobs.aspx/sendEmail",
        type: "POST",
        async: false,
        contentType: false,
        processData: false,
        data: null,
        success: function (result) {
            alert(result);
        },
        error: function (err) {
            alert(err.statusText);
        }
    });

}

Any suggestions on how to make this work seamlessly?

javascript c#asp.net ajax

Answer 1

Answer №1

If you want to enable file uploads using ajax, consider implementing a Generic handler. Here's an example code snippet that demonstrates how to achieve this:

function uploadFiles() {

var formData = new FormData();
var files = $('.attachment');
$.each(files, function (key, value) {
    var file = $(value).data('file');
    formData.append(file.name, file);
});

$.ajax({
    url: "FileUploadHandler.ashx",
    type: "POST",
    contentType: false,
    processData: false,
    data: formData,
    success: function (response) {
        alert(response);
    },
    error: function (error) {
        alert(error.statusText);
    }
});
}

Utilizing a Generic Handler

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

using System;    
using System.Web;    

public class FileUploadHandler : 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 fileName = context.Server.MapPath("~/uploads/" + file.FileName);    
            file.SaveAs(fileName);    
        }    
        context.Response.ContentType = "text/plain";      
    }    

}      
}

Answer 2

If you want to enable file uploads using ajax, consider implementing a Generic handler. Here's an example code snippet that demonstrates how to achieve this:

function uploadFiles() {

var formData = new FormData();
var files = $('.attachment');
$.each(files, function (key, value) {
    var file = $(value).data('file');
    formData.append(file.name, file);
});

$.ajax({
    url: "FileUploadHandler.ashx",
    type: "POST",
    contentType: false,
    processData: false,
    data: formData,
    success: function (response) {
        alert(response);
    },
    error: function (error) {
        alert(error.statusText);
    }
});
}

Utilizing a Generic Handler

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

using System;    
using System.Web;    

public class FileUploadHandler : 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 fileName = context.Server.MapPath("~/uploads/" + file.FileName);    
            file.SaveAs(fileName);    
        }    
        context.Response.ContentType = "text/plain";      
    }    

}      
}

Tips for uploading files in asp.net using an ajax call

Answer №1

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