DxUpload.Visible Property

Specifies whether the Upload is visible.

Assembly : DevExpress.Blazor.v25.2.dll

Declaration

csharp

[DefaultValue(true)]
[Parameter]
public bool Visible { get; set; }

Property Value

Type	Default	Description
Boolean	true

true, to display the Upload; otherwise, false.

Remarks

Use the Visible property to show or hide the Upload.

The following example dynamically changes the Upload’s visibility state and implement the external UI: Select File button via the ExternalSelectButtonCssSelector property and drop zone container via the ExternalDropZoneCssSelector property. Handle the SelectedFilesChanged event and hide the Upload when the file list is empty.

Razor
CSS
UploadController

razor

<div id="overviewDemoDropZone" class="card custom-drop-zone bg-light rounded-3 w-100 m-0">
    <span class="drop-file-icon mb-3"></span>
    <span>Drag and Drop File Here</span><span class="m-1">or</span>
    <button id="overviewDemoSelectButton" class="btn border-primary btn-primary m-1">Select File</button>
</div>
<DxUpload Name="myFile" UploadUrl="https://localhost:10000/api/Upload/Upload/" 
          Visible="@UploadVisible" 
          ExternalSelectButtonCssSelector="#overviewDemoSelectButton" 
          ExternalDropZoneCssSelector="#overviewDemoDropZone"
          ExternalDropZoneDragOverCssClass="bg-light border-secondary text-dark"
          SelectedFilesChanged="@SelectedFilesChanged">
</DxUpload>

@code {
    bool UploadVisible { get; set; } = false;

    protected void SelectedFilesChanged(IEnumerable<UploadFileInfo> files) {
        UploadVisible = files.ToList().Count > 0;
        InvokeAsync(StateHasChanged);
    }
}

css

.custom-drop-zone {
    padding: 0 !important;
    border-style: dashed !important;
    border-width: 2px !important;
    height: 230px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.custom-drop-zone svg {
    width: 42px;
    height: 42px;
}
.drop-file-icon {
    background-size: contain;
    mask-repeat: no-repeat;
    -webkit-mask-repeat: no-repeat;
    background-position: center center;
    background-color: currentColor;
    width: 48px;
    height: 48px;
    -webkit-mask-image: url("../images/icons/drop-file.svg");
    mask-image: url("../images/icons/drop-file.svg");
}

csharp

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace BlazorDemo.AspNetCoreHost;
[Route("api/[controller]")]
[ApiController]
public class UploadController : ControllerBase {
    [HttpPost("[action]")]
    public ActionResult Upload(IFormFile myFile) {
        try {
            // Write code that saves the 'myFile' file.
            // Don't rely on or trust the FileName property without validation.
        } catch {
            return BadRequest();
        }
        return Ok();
    }
}

Run Demo: Upload - Overview