When the Upload has Initial Files, the RemoveUrl endpoint is not called when the user removes them from the UI. 

ADMIN EDIT

.razor file

@inject HttpClient HttpClient

.....

    private async Task OnUploadRemove(UploadEventArgs args)
    {
        args.RequestData.Add("category", "ships"); // for example, user name
        args.RequestData.Add("id", shipId);

        if (args.Files.First().Status == UploadFileStatus.Blank)
        {
            var multipartContent = new MultipartFormDataContent();
            multipartContent.Add(new StringContent(args.Files.First().Name), "files");
            multipartContent.Add(new StringContent("ships"), "category");
            multipartContent.Add(new StringContent(shipId.ToString()), "id");
            await HttpClient.PostAsync(RemoveUrl, multipartContent);
        }
    }

Program.cs

builder.Services.AddHttpClient();

I am trying to upload files to an URL that is not in my control and it requires the PUT HTTP method. The Telerik Blazor Upload always uses a POST.

I imagine API like this would be nice:

        <TelerikUpload SaveUrl="@SaveUrl" SaveMethod="PUT">

        </TelerikUpload>

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ADMIN EDIT

In the meantime, there are two possible solutions:

• Upload the file to your own server that can accept POST and use that server to upload to the third party. This can help hide URLs and security from your end users as well.
• Implement a FileSelect type of component to get the file in code and upload it with your own HTTP request from C#.

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Accessibility issue
impacts screen reader user

[WCAG 1.3.1 level A] [WCAG 4.1.3 level AA]

tested using NVDA on chrome browser

on selecting upload button (w/ files already chosen) user is not advised the overall status of the files or individual files.

A visual user is informed;

• overall status as 'done'.
• completeness of individual files

This has not been 100% tested, as the upload was not targeted to an end point.

Suggestion: use aria-live

Also note, on selecting the upload button the focus is returned to input, and input says no files.

Like in the Kendo Upload https://docs.telerik.com/kendo-ui/api/javascript/ui/upload/configuration/files - I want to show some files initially to my user

=====

ADMIN EDIT:

A possible workaround is to use a ListView and mimic the Upload/FileSelect interface:

<TelerikUpload SaveUrl="api/upload/save"
               RemoveUrl="api/upload/remove">
</TelerikUpload>

@{
    if (OldFiles.Any())
    {
        <p>Older files:</p>

        <div class="k-upload">
            <ul class="k-upload-files k-reset">
                <TelerikListView Data="@OldFiles" @ref="@ListView">
                    <Template>
                        <li class="k-file k-file-success">
                            <div class="k-file-single">
                                <span class="k-file-group-wrapper">
                                    <span class="k-file-group k-icon k-i-file"></span>
                                </span>
                                <span class="k-file-name-size-wrapper">
                                    <span class="k-file-name " title="@context.Name"> @context.Name </span>
                                    <span class="k-file-validation-message k-text-success">Existing file.</span>
                                </span>
                                <span class="k-upload-status">
                                    <TelerikButton ButtonType="@ButtonType.Button" Title="Remove"
                                                   OnClick="@( _ => RemoveOldFile(context) )"
                                                   Icon="x" FillMode="@ThemeConstants.Button.FillMode.Flat" />
                                </span>
                            </div>
                        </li>
                    </Template>
                </TelerikListView>
            </ul>
        </div>
    }
}

@code {
    TelerikListView<UploadedFile> ListView { get; set; }

    List<UploadedFile> OldFiles { get; set; } = new List<UploadedFile>()
    {
        new UploadedFile() { Id = 1, Name = "foo.txt" },
        new UploadedFile() { Id = 2, Name = "bar.txt" },
    };

    async Task RemoveOldFile(UploadedFile file)
    {
        // delete the file from the remote server...
        // ...
 
        // update the client UI
        OldFiles.Remove(file);
        ListView.Rebind();
    }

    public class UploadedFile
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

I would like to have the upload component but change the text on the button (or maybe its entire content through a render fragment template) through a Parameter on the component level.

At the moment I can only do this through localization for all components.

---

ADMIN EDIT

---

The request targets both the Upload and the FileSelect components.

Please provide item templates for the file list, similar to:

• https://www.telerik.com/kendo-angular-ui/components/uploads/upload/templates/
• https://demos.telerik.com/kendo-ui/upload/templates

accessibility issue - upload is not notifying files are chosen

Impacts screen reader users

[WCAG 1.3.1 level A] [WCAG 4.1.3 level AA]

tested using NVDA on chrome browser

input (type="file") status always reads as 'no file chosen' when one or more files have been chosen (correct when no files are chosen). 

on choosing a file to upload (so no file chosen yet), screen reader advises; web page title, chrome, page contents, file input status (same behaviour as default html 5 file input). On choosing a file a default browser html 5 file input will advise a file has been chosen. The list shown below the Telerik component is not known to a screen reader user

Accessibility issue

impacts keyboard user

[WCAG 2.1.1 level A]

tested using NVDA on chrome browser

the ability to remove, review, & navigate (with direction keys) each item chosen for upload is not directly accessible via a keyboard, To overcome this the user needs a screen reader to read line by line.  
At least, a screen reader user can do the following inside the list:

• be advised (when forcefully reading line by line); how many items in list, filename, file is incorrect or file size, (optional) reload button, and remove button.
• use 'del' key to remove an item. 

Ref: https://demos.telerik.com/kendo-ui/upload/initialfiles

TelerikUpload control is a good start. However, missing an important feature of initial files. When can we expect this feature to be added to the control?

<TelerikUpload SaveUrl="@SaveUrl"
                               RemoveUrl="@RemoveUrl"
                               AllowedExtensions="@( new List<string>() { ".pdf", ".docx" } )"
                               OnSelect="@OnSelectHandler"
                               OnCancel="@OnCancelHandler"
                               OnRemove="@OnRemoveHandler">
                </TelerikUpload>

When the AllowedExtensions is set for the Telerik Upload control, it is expected that the File selection dialog box should filter the files by the file types in the Allowed extensions only. However, the dialog shows all files.

------

ADMIN EDIT

This will likely be exposed via the accept attribute the <input type=file> exposes. Note that it requires MIME types, not extensions.

At the moment, the extension can be filtered only after the file is selected: https://docs.telerik.com/blazor-ui/components/upload/validation.

-----

The upload status hangs on "Uploading..." if the Upload component is hosted in a Dialog and the OnSuccess event is used.

<AdminEdit>

As a workaround, you can host the Upload in a Window, where this issue is not present

</AdminEdit>

I would like to have my users click my own button or element to trigger the file select dialog that you get from clicking the "Select Files..." button on the Upload component.

A workaround is to use a function like this

window.customUploadClick = function () {
    $('.k-upload-button input').trigger('click');
}

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ADMIN EDIT

Completed with 3.0.0 release

If you are not using jQuery already, you don't have to add it for this, standard browser API can do this too:

@inject IJSRuntime _js

<script suppress-error="BL9992">
    window.customUploadClick = function () {
        document.querySelector(".k-upload-button input").click();
    }
</script>

<TelerikButton OnClick="@InvokeSelectClick">invoke click</TelerikButton>

<TelerikUpload></TelerikUpload>

@code{
    async Task InvokeSelectClick()
    {
        await _js.InvokeVoidAsync("customUploadClick");
    }
}

---