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

@{
    var 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" };
}

<div class="control_wrapper">
    <div id='preview'></div>
    <ejs-uploader id="UploadFiles" selected="onSelect" allowedExtensions=".jpg, .jpeg,.png" asyncSettings="@asyncSettings"></ejs-uploader>
</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 Core File Upload feature tour page for its groundbreaking features. You can also explore our ASP.NET Core File Upload example to understand how to browse the files which you want to upload to the server.