hamann-ausgabe-core/HaWeb/Views/Admin/Upload/Index.cshtml

@model UploadViewModel;

<div class="ha-adminuploadfields">
  @foreach (var item in Model.AvailableRoots.OrderBy(x => x.Type)) {
    <div class="ha-uploadfield">
      <div class="ha-uploadfieldname">@item.Type</div>
      @if (Model.UsedFiles != null && Model.UsedFiles.ContainsKey(item.Prefix)) {
        @foreach(var file in Model.UsedFiles[item.Prefix]) {
          <span>@file.File.Name</span>
        } 
      }
    </div>
  }
  <form class="ha-uploadform" id="uploadForm" action="Upload" method="post" enctype="multipart/form-data">
      <label class="filelabel" id="dropzone">
        <input class="hidden" id="file" type="file" accept=".xml" name="file" />
        Upload2 es
      </label>
      <div class="ha-uploadmessage">
          <output form="uploadForm" name="result"></output>
      </div>
  </form>
</div>

@section Scripts {

  <script>
    "use strict";

    const dropHandler = function (formelement, ev, dropzone) {
      ev.preventDefault();

      if (ev.dataTransfer.items) {
        if (ev.dataTransfer.items[0].kind === 'file') {
          var file = ev.dataTransfer.items[0].getAsFile();
          AJAXSubmit(formelement, file);
        } else {
          var file = ev.dataTransfer.files[0];
          AJAXSubmit(formelement, file);
        }
      }
    }

    const dragOverHandler = function (ev, dropzone) {
      ev.preventDefault();
    }

    const dragLeaveHander = function (ev, dropzone) {
      ev.preventDefault();
    }

    const dragEnterHandler = function (ev, dropzone) {
      ev.preventDefault();
    }

    const AJAXSubmit = async function (oFormElement, file = null) {
      var fd = new FormData();
      if (file !== null) fd.append("file", file);
      else fd = new FormData(oFormElement);
      oFormElement.elements.namedItem("result").value = "Wait";
      await fetch(oFormElement.action, {
          method: 'POST',
          headers: {
            'RequestVerificationToken': getCookie('RequestVerificationToken')
          },
          body: fd
        })
        .then(response => response.json())
        .then(json => {
          if ("Error" in json) {
            oFormElement.elements.namedItem("result").value = json.Error;
          } else {
            oFormElement.elements.namedItem("result").value = "Erfolg!";
          }
        })
        .catch ((e) => console.error('Error:', error))
    }

    function getCookie(name) {
      var value = "; " + document.cookie;
      var parts = value.split("; " + name + "=");
      if (parts.length == 2) return parts.pop().split(";").shift();
    }

    window.addEventListener("load", function () {
      var submitelement = document.getElementById("file");
      var formelement = document.getElementById("uploadForm");
      var dropzone = document.getElementById("dropzone");
      submitelement.addEventListener("change", () => AJAXSubmit(formelement));
      dropzone.addEventListener("drop", (ev) => dropHandler(formelement, ev, dropzone));
      dropzone.addEventListener("dragover", (ev) => dragOverHandler(ev, dropzone));
      dropzone.addEventListener("dragleave", (ev) => dragLeaveHander(ev, dropzone));
      dropzone.addEventListener("dragenter", (ev) => dragEnterHandler(ev, dropzone));
    });

    
  </script>
}