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Custom Dropzone

The FileUploader widget supports the drag-and-drop functionality to upload files.

In this demo, the dropZone option specifies the HTML element in which you can drag and drop files for upload. The dropZoneEnter and dropZoneLeave events allow you to customize the drop zone when the mouse pointer enters and leaves this zone while dragging the file.

<div class="widget-container flex-box"> <span>Profile Picture</span> <div id="dropzone-external" class="flex-box dx-theme-border-color"> <img id="dropzone-image" src="#" hidden alt="" onload="toggleImageVisible(true)" /> <div id="dropzone-text" class="flex-box"> <span>Drag & Drop the desired file</span> <span>…or click to browse for a file instead.</span> </div> @(Html.DevExtreme().ProgressBar() .ID("upload-progress") .Min(0) .Max(100) .Width("30%") .ShowStatus(false) .Visible(false) ) </div> @(Html.DevExtreme().FileUploader() .DialogTrigger("#dropzone-external") .DropZone("#dropzone-external") .ID("file-uploader") .Name("myFile") .Multiple(false) .AllowedFileExtensions(new[] { ".jpg", ".jpeg", ".gif", ".png" }) .UploadMode(FileUploadMode.Instantly) .UploadUrl(Url.Action("Upload", "FileUploader")) .Visible(false) .OnDropZoneEnter("fileUploader_dropZoneEnter") .OnDropZoneLeave("fileUploader_dropZoneLeave") .OnUploaded("fileUploader_uploaded") .OnProgress("fileUploader_progress") .OnUploadStarted("fileUploader_uploadStarted") ) </div> <script> function getProgressBarInstance() { return $("#upload-progress").dxProgressBar("instance"); } function fileUploader_dropZoneEnter(e) { if(e.dropZoneElement.id === "dropzone-external") toggleDropZoneActive(e.dropZoneElement, true); } function fileUploader_dropZoneLeave(e) { if(e.dropZoneElement.id === "dropzone-external") toggleDropZoneActive(e.dropZoneElement, false); } function fileUploader_uploaded(e) { const file = e.file; const fileReader = new FileReader(); fileReader.onload = function() { toggleDropZoneActive($("#dropzone-external")[0], false); $("#dropzone-image")[0].src = fileReader.result; } fileReader.readAsDataURL(file); $("#dropzone-text")[0].style.display = "none"; getProgressBarInstance().option({ visible: false, value: 0 }); } function fileUploader_progress(e) { getProgressBarInstance().option("value", e.bytesLoaded / e.bytesTotal * 100); } function fileUploader_uploadStarted() { toggleImageVisible(false); getProgressBarInstance().option("visible", true); } function toggleDropZoneActive(dropZone, isActive) { dropZone.classList.toggle("dx-theme-accent-as-border-color", isActive); dropZone.classList.toggle("dx-theme-border-color", !isActive); dropZone.classList.toggle("dropzone-active", isActive); } function toggleImageVisible(visible) { $("#dropzone-image")[0].hidden = !visible; } </script>
using DevExtreme.NETCore.Demos.Models.FileManagement; using Microsoft.AspNetCore.Http; using Microsoft.AspNetCore.Mvc; using Newtonsoft.Json; using System; using System.Collections.Generic; using System.IO; using System.Linq; namespace DevExtreme.NETCore.Demos.Controllers { public partial class FileUploaderController : Controller { public ActionResult CustomDropzone() { return View(); } } }
#dropzone-external { width: 350px; height: 350px; background-color: rgba(183, 183, 183, 0.1); border-width: 2px; border-style: dashed; padding: 10px; } #dropzone-external > * { pointer-events: none; } #dropzone-external.dropzone-active { border-style: solid; } .widget-container > span { font-size: 22px; font-weight: bold; margin-bottom: 16px; } #dropzone-image { max-width: 100%; max-height: 100%; } #dropzone-text > span { font-weight: 100; opacity: 0.5; } #upload-progress { display: flex; margin-top: 10px; } .flex-box { display: flex; flex-direction: column; justify-content: center; align-items: center; }