DxUpload.SelectedFilesChanged Event

Fires when the file list changes.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v21.1.dll

Declaration

[Parameter]
public Action<IEnumerable<UploadFileInfo>> SelectedFilesChanged { get; set; }

Parameters

Type Description
IEnumerable<UploadFileInfo>

A collection of UploadFileInfo objects that store information about files.

Remarks

Once a user selected or dropped a file, the Upload adds it to the file list. Users can then remove files from the list.

Upload Overview

The SelectedFilesChanged event occur each time the file list is changed (even if the ShowFileList property is set to false).

The following example demonstrates how to handle this event and dynamically change the Upload’s Visible property. Use the ExternalSelectButtonCssSelector and ExternalDropZoneCssSelector properties to implement the external Select File button and drop zone container.

<div id="overviewDemoDropZone" class="card custom-drop-zone jumbotron">
    <svg class="drop-file-icon mb-3" role="img" style="width: 42px; height: 42px;"><use href="#drop-file-icon"></use></svg>
    <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/UploadFile/" 
          Visible="@UploadVisible" 
          ExternalSelectButtonCssSelector="#overviewDemoSelectButton" 
          ExternalDropZoneCssSelector="#overviewDemoDropZone"
          ExternalDropZoneDragOverCssClass="custom-drag-over border-light text-white" 
          SelectedFilesChanged="@SelectedFilesChanged">
</DxUpload>

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

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

Upload External UI

Run Demo: Upload - Overview

See Also