I can't upload and save file by javascript. How can I do?

Question

0.00/5 (No votes)

See more:

Guys I can't upload file. I can send value for example "content" but when I try send image it doesn't work.

HTML

<form asp-action="Add" asp-controller="Tweet" method="post" enctype="multipart/form-data">
<span><textarea style="background-color:black" placeholder="Neler oluyor?" id="content" asp-for="Content" class="form-control p-0 my-0"></textarea>
<input type="file" id="myFile" name="myFile" /></span>

JavaScript

     document.querySelector("#ekle").addEventListener('click', ekle);
function ekle() {
             var content = $("#content").val();
             var file = document.querySelector("#myFile").files[0];
             let formData = new FormData();
             formData.append("image", file);
             var username = '@User.Identity.Name';
             $.ajax({
                    dataType:'json',
                 url:'/Member/Tweet/Add',
                 data: { "content": content, "image": formData },
                   type: 'POST'

C#

public void Add(TweetDTO model, string userName, string content, IFormFile image)
        {
            var user = _uow.User.Find(x => x.UserName == userName);
            model.Content = content;
            model.UserId = user.Id;
            string uploadDir = Path.Combine(_environment.WebRootPath, "media/tweet");
            if (!Directory.Exists(uploadDir))
            {
                Directory.CreateDirectory(uploadDir);
            }
            string fileName = Path.GetFileName(image.FileName);
            using (FileStream stream = new FileStream(Path.Combine(uploadDir, fileName), FileMode.Create))
            {

                image.CopyTo(stream);
                model.ImagePath = fileName;

            }
            Tweet tweet = _mapper.Map<Tweet>(model);
            _uow.Tweet.Add(tweet);
            _uow.SaveChange();
        }

What I have tried:

Like I said I can send "content" value but I can't send image. I searched on web and I tried many way but they were same all.

Posted 20-May-20 14:02pm

Member 14769019

Updated 21-May-20 6:50am

v2

Add a Solution

2 solutions

Solution 1

See CodeProject article: Upload Images Using C#, JavaScript and ASP.NET 2.0 Client Callbacks[^]

Also see: How Do I Saved In Db My Uploaded Image With Javascript In C# Code Behind[^]

Posted 20-May-20 19:57pm

RickZeeland

Updated 20-May-20 20:03pm

v2

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Accepted Answer · 2020-05-21T06:51:00

The FormData object needs to contain the entire data to submit.

You'll also need to set the processData and contentType options to false, and remove the dataType: 'json' option.

And you should properly encode your user's name before emitting it into a Javascript variable. Since this appears to be ASP.NET Core, you should be able to use the JsonHelper extensions[^]:

JavaScript

let formData = new FormData();
formData.append("username", @Json.Serialize(User.Identity.Name));

var content = $("#content").val();
formData.append("content", content);

var file = document.querySelector("#myFile").files[0];
formData.append("image", file);

$.ajax({
    url:'/Member/Tweet/Add',
    data: formData
    type: 'POST',
    processData: false,
    contentType: false,

Using FormData Objects - Web APIs | MDN[^]
Sending FormData with jQuery.ajax() | Matt Lunn[^]