DxFileInput.ExternalDropZoneDragOverCssClass Property

Specifies the CSS class applied to the drop zone when users drag files over it.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.1.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public string ExternalDropZoneDragOverCssClass { get; set; }

Property Value

Type	Description
String	The CSS class applied to the drop zone when users drag files over it.

Remarks

You can enable drag and drop functionality in the File Input component. To enable this functionality, create a drop zone and assign its CSS selector to the ExternalDropZoneCssSelector property. The ExternalDropZoneDragOverCssClass property specifies the CSS class applied to this drop zone when users drag files over it.

The following example implements a drop zone container for the File Input component:

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>
</div>

<DxFileInput FilesUploading="OnFilesUploading"
             ShowSelectButton="false"
             ExternalDropZoneCssSelector="#overviewDemoDropZone"
             ExternalDropZoneDragOverCssClass="bg-light border-secondary text-dark" />

@code {
    async Task OnFilesUploading(FilesUploadingEventArgs args) {
        foreach (var file in args.Files) {
            /* The following code is intended for demonstration purposes only.
            Do not read a stream directly in memory to avoid performance and security-related issues. */
            using var stream = new System.IO.MemoryStream();
            await file.OpenReadStream(file.Size).CopyToAsync(stream);
        }
    }
}

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");
}

Run Demo: File Input - Overview