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book-progress's Issues

store data into db

  • load realm web
  • register, login, pass reset, mail confirmation
  • load apollo
  • save progress, load progress

import/export via file upload/download

ref. https://stackoverflow.com/a/18197341 for downloading

function download(filename, text) {
  var element = document.createElement('a');
  element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
  element.setAttribute('download', filename);

  element.style.display = 'none';
  document.body.appendChild(element);

  element.click();

  document.body.removeChild(element);
}

ref. https://web.dev/read-files/ for reading file

  • form
<!-- The `multiple` attribute lets users select multiple files. -->
<input type="file" id="file-selector" multiple>
<script>
  const fileSelector = document.getElementById('file-selector');
  fileSelector.addEventListener('change', (event) => {
    const fileList = event.target.files;
    console.log(fileList);
  });
</script>
  • drop zone
const dropArea = document.getElementById('drop-area');

dropArea.addEventListener('dragover', (event) => {
  event.stopPropagation();
  event.preventDefault();
  // Style the drag-and-drop as a "copy file" operation.
  event.dataTransfer.dropEffect = 'copy';
});

dropArea.addEventListener('drop', (event) => {
  event.stopPropagation();
  event.preventDefault();
  const fileList = event.dataTransfer.files;
  console.log(fileList);
});
  • read and progress
function readFile(file) {
  const reader = new FileReader();
  reader.addEventListener('load', (event) => {
    const result = event.target.result;
    // Do something with result
  });

  reader.addEventListener('progress', (event) => {
    if (event.loaded && event.total) {
      const percent = (event.loaded / event.total) * 100;
      console.log(`Progress: ${Math.round(percent)}`);
    }
  });
  reader.readAsDataURL(file);
}

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