Achieve invisible upload

21 Dec 20223 minutes to read

You can achieve the invisible upload feature by using the selected event in uploader control.
Refer to the following example.

CSHTML

<div class="control_wrapper">
    <div id='preview'></div>
      @Html.EJS().Uploader("UploadFiles").AllowedExtensions(".png, .jpg, .jpeg").Selected("onSelect").AsyncSettings(new Syncfusion.EJ2.Inputs.UploaderAsyncSettings { SaveUrl = "https://services.syncfusion.com/aspnet/production/api/FileUploader/Save", RemoveUrl = "https://services.syncfusion.com/aspnet/production/api/FileUploader/Remove" }).Render()
</div>
<script>
    function onSelect(args) {
        for (var i = 0; i < args.filesData.length; i++) {
            var liparentDiv = ej.base.createElement('div', { className: 'image-list' });
            var liImage = ej.base.createElement('img', { className: 'image' });
            liparentDiv.appendChild(liImage);
            readURL(liImage, args.filesData[i]);
            document.getElementById('preview').appendChild(liparentDiv);
        }
        args.cancel = true;
    }

    function readURL(liImage, file) {
        var imgPreview = liImage;
        var imageFile = file.rawFile;
        var reader = new FileReader();
        reader.addEventListener('load', () => {
            imgPreview.src = reader.result;
        }, false);
        if (imageFile) {
            reader.readAsDataURL(imageFile);
        }
    }
</script>

Index.css

.control_wrapper {
	max-width: 505px;
	margin: auto;
}

#preview {
	border: 2px dashed #ddd;
	padding: 15px;
}

.image-list {
	width: 134px;
	height: 117px;
	margin-right: 4px;
	border: 1px solid lightgrey;
	display: inline-block;
}

.image {
	width: 134px;
	height: 117px;
	margin-right: 4px;
	display: inline-block;
}

.e-control ul {
	border: 1px solid #ddd;
}

.e-control .e-file-select,
.e-control .e-file-drop {
	display: none;
}

.e-control {
	margin-top: 10px;
}

NOTE

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.