sending image file using ajax to controller action getting null value in action parameter asp.net core

Question

Hi there to all of you.

When I attempt to upload an image file using an Ajax call and send it to the controller action (asp.net core), sometimes I get an image file and sometimes get a null value in the controller action what could be the reason?

HTML:

<div class="form-group">
       <label>Profile Picture</label>
       <div class="row">
            <div class="col-md-9">
                    <input id="profilePicture" class="form-control form-control-lg" type="file" accept=".jpeg, .jpg, .png">
             </div>
             <div class="col-md-3">
                    <button id="uploadImage" type="submit" class="form-control form-control-lg btn btn-primary" style="color: white">Upload</button>
            </div>
        </div>
 </div>

JavaScript:

$('#uploadImage').on('click', function () {
    var fileInput = $('#profilePicture')[0];
    var file = fileInput.files[0];
    console.log(file);

    if (file === undefined || file === null) {
        alert("Please Select File");       
        console.log(file);
    }else{
        var formData = new FormData();
        formData.append('profileImage', file);
    }
    console.log(formData.get("profileImage"))

    $.ajax({
        url: '@Url.Action("UploadImage", "User")',
        type: 'POST',
        data: formData,
        contentType: false,
        processData: false,
        success: function (response) {
            if (response.flag) {
                toastr.success(response.message, "Success!");
            } else {
                toastr.error(response.message, "Error!");
            }
        },
        error: function (xhr, status, error) {
            alert("Some Issue Occurred Please Try Again");
            toastr.error("An error occurred while uploading the image.", "Error!");
        }
    });
});

Server Side Code:

public async Task<ViewModel.BaseResponse> UploadImage(IFormFile profileImage)
{
    ViewModel.BaseResponse Response = new ViewModel.BaseResponse();
    try
    {
        string email = HttpContext.Session.GetString("email"); 
        byte[] imageData;
        using (var memoryStream = new MemoryStream())
        {
            await profileImage.CopyToAsync(memoryStream);
            imageData = memoryStream.ToArray();
        }
        var imagebase64 = Convert.ToBase64String(imageData);
        
        var request = new UploadImageRequest
        {
            Email = email,
            ProfileImage = imagebase64
        };

        var authToken = string.Empty;
        var route = "UploadImage";
        var response = await DataHelper<ViewModel.BaseResponse>.Execute(route, OperationTypes.POST, authToken, request);
        if (response != null && response.Data != null)
        {
            Response.Flag = response.Flag;
            Response.Message = response.Message; 
        }
    }
    catch
    {
    }
    return Response;
}

UploadImageRequest Class:

public class UploadImageRequest
{
    public string Email { get; set; }
    public string ProfileImage { get; set; }
}

Your script checks if the user selected a file - but if they didn't, you still let it proceed with making the AJAX request. — C3roe
– C3roe, Commented Sep 2, 2024 at 11:42
tried this: contentType: "multipart/form-data" but still getting null value in controller — MANSI
– MANSI, Commented Sep 2, 2024 at 13:10
@C3roe is correct; if no file is selected, alert and just return. — SoftwareDveloper
– SoftwareDveloper, Commented Sep 2, 2024 at 21:45
hI @MANSICHANU, does your view contain form? The button you are using to trigger the file upload is of type submit, which can cause a form submission event, potentially interfering with the AJAX call. Your can prevent form's default submit behavior by using code like: $('#uploadImage').on('click', function (event) { event.preventDefault(); . — Rena
– Rena, Commented Sep 3, 2024 at 5:58

Rena · Accepted Answer · 2024-09-13 07:05:09Z

0

The button you are using to trigger the file upload is of type submit, which can cause a form submission event, potentially interfering with the AJAX call.

You can prevent form's default submit behavior by using code like:

$('#uploadImage').on('click', function (event) 
{     
    event.preventDefault(); 
    //do your stuff....
}

answered Sep 13, 2024 at 7:05

Rena

37.2k7 gold badges50 silver badges93 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Ogunlade Olawale · Accepted Answer · 2024-09-13 08:05:21Z

You need to add the [FromForm] attribute to your form parameter.

Here is how i would implement it

public class ImageUploadModel
{
    public IFromFile ProfileImage {get; set;}
}

public async Task<ViewModel.BaseResponse> UploadImage([FromForm] ImageUploadModel model)
{
    ViewModel.BaseResponse Response = new ViewModel.BaseResponse();
    try
    {
        string email = HttpContext.Session.GetString("email"); 
        byte[] imageData;
        using (var memoryStream = new MemoryStream())
        {
            await model.ProfileImage.CopyToAsync(memoryStream);
            imageData = memoryStream.ToArray();
        }
        var imagebase64 = Convert.ToBase64String(imageData);
        
        var request = new UploadImageRequest
        {
            Email = email,
            ProfileImage = imagebase64
        };

        var authToken = string.Empty;
        var route = "UploadImage";
        var response = await DataHelper<ViewModel.BaseResponse>.Execute(route, OperationTypes.POST, authToken, request);
        if (response != null && response.Data != null)
        {
            Response.Flag = response.Flag;
            Response.Message = response.Message; 
        }
    }
    catch
    {
    }
    return Response;
}

Luciano Montañez · Accepted Answer · 2024-09-02 11:48:10Z

So, it looks like you're not actually sending the formData to the server. You*re creating the object and adding the file, but then you're passing an empty object in the AJAX request. Try changing this to send the formData instead

$('#uploadImage').on('click', function () {
    var fileInput = $('#profilePicture')[0];
    var file = fileInput.files[0];
    console.log(file);

    if (file === undefined || file === null) {
        alert("Please Select File");       
        console.log(file);
    }else{
        var formData = new FormData();
        formData.append('profileImage', file);

        $.ajax({
            url: '@Url.Action("UploadImage", "User")',
            type: 'POST',
            data: formData,
            contentType: false,
            processData: false,
            success: function (response) {
                if (response.flag) {
                    toastr.success(response.message, "Success!");
                } else {
                    toastr.error(response.message, "Error!");
                }
            },
            error: function (xhr, status, error) {
                alert("Some Issue Occurred Please Try Again");
                toastr.error("An error occurred while uploading the image.", "Error!");
            }
        });
    }
});

Collectives™ on Stack Overflow

sending image file using ajax to controller action getting null value in action parameter asp.net core

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related