Validate image/* on drop

24 Feb 20222 minutes to read

The uploader control allows you to select all types of images using the *image/ ** to allowedExtensions property. You can directly set it to accept the attribute of uploader element.

By default, it is working fine when you select a file by clicking the browse button. But, this behavior is not supported to drag and drop the files for selection.

<div class="control_wrapper">
    @Html.EJS().Uploader("fileupload").AutoUpload(false).AllowedExtensions("image/*").Selected("onSelect").AsyncSettings(new Syncfusion.EJ2.Inputs.UploaderAsyncSettings { SaveUrl = "", RemoveUrl = "" }).Render()

    function onSelect(args) {
     var uploadObj = document.getElementById("fileupload").ej2_instances[0];
         if (event.type === 'change') {
            var allImages = ['jpg', 'jpeg', 'gif', 'tiff', 'bpg'];
            var files = args.filesData;
            var modifiedFiles = [];
            for (var i = 0; i < files.length; i++) {
                var file = files[i];
                if (allImages.indexOf(file.type) === -1) {
                    file.status = 'File type is not allowed';
                    file.statusCode = '0';
         args.isModified = true;
         args.modifiedFilesData = modifiedFiles.concat(uploadObj.filesData);
.control_wrapper {
	max-width: 505px;
	margin: auto;

You can also explore ASP.NET MVC File Upload feature tour page for its groundbreaking features. You can also explore our ASP.NET MVC File Upload example to understand how to browse the files which you want to upload to the server.