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Achieve Invisible Upload in ASP.NET Core Uploader control

30 Jul 2021 / 1 minute to read

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

tagHelper
invisible.cs
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@{
    var asyncSettings = new Syncfusion.EJ2.Inputs.UploaderAsyncSettings { SaveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/Save", RemoveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/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>
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace EJ2CoreSampleBrowser.Controllers.TextBoxes
{
    public partial class UploaderController : Controller
    {
        public ActionResult DefaultFunctionalities()
        {
            return View();
        }
    }
}

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.