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<title>SheetJS + canvas-datagrid Live Demo</title>
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<pre>
<b><a href="https://sheetjs.com">SheetJS + canvas-datagrid Demo</a></b>

<div id="drop">Drop a spreadsheet file here to see sheet data</div>
<input type="file" name="xlfile" id="xlf" /> ... or click here to select a file
<textarea id="b64data">... or paste a base64-encoding here</textarea>
<b>Advanced Demo Options:</b>
</pre>
<p><input type="submit" value="Export to XLSX!" id="xport" onclick="export_xlsx();" disabled="true"></p>
<div id="htmlout"></div>
<br />
<script src="https://unpkg.com/canvas-datagrid/dist/canvas-datagrid.js"></script>
<script src="https://cdn.sheetjs.com/xlsx-latest/package/dist/shim.min.js"></script>
<script src="https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js"></script>
<script>
/*jshint browser:true */
/* eslint-env browser */
/* eslint no-use-before-define:0 */
/*global Uint8Array, Uint16Array, ArrayBuffer */
/*global XLSX */

var cDg;

var process_wb = (function() {
  var XPORT = document.getElementById('xport');
  var HTMLOUT = document.getElementById('htmlout');

  return function process_wb(wb) {
    /* get data */
    var ws = wb.Sheets[wb.SheetNames[0]];
    var data = XLSX.utils.sheet_to_json(ws, {header:1});

    /* update canvas-datagrid */
    if(!cDg) cDg = canvasDatagrid({ parentNode:HTMLOUT, data:data });
    cDg.style.height = '100%';
    cDg.style.width = '100%';
    cDg.data = data;
    XPORT.disabled = false;

    /* create schema (for A,B,C column headings) */
    var range = XLSX.utils.decode_range(ws['!ref']);
    for(var i = range.s.c; i <= range.e.c; ++i) cDg.schema[i - range.s.c].title = XLSX.utils.encode_col(i);

    HTMLOUT.style.height = (window.innerHeight - 400) + "px";
    HTMLOUT.style.width = (window.innerWidth - 50) + "px";

    if(typeof console !== 'undefined') console.log("output", new Date());
  };
})();

var do_file = (function() {
  return function do_file(files) {
    var f = files[0];
    var reader = new FileReader();
    reader.onload = function(e) {
      if(typeof console !== 'undefined') console.log("onload", new Date());
      var data = e.target.result;
      data = new Uint8Array(data);
      process_wb(XLSX.read(data, {type: 'array'}));
    };
    reader.readAsArrayBuffer(f);
  };
})();

(function() {
  var drop = document.getElementById('drop');
  if(!drop.addEventListener) return;

  function handleDrop(e) {
    e.stopPropagation();
    e.preventDefault();
    do_file(e.dataTransfer.files);
  }

  function handleDragover(e) {
    e.stopPropagation();
    e.preventDefault();
    e.dataTransfer.dropEffect = 'copy';
  }

  drop.addEventListener('dragenter', handleDragover, false);
  drop.addEventListener('dragover', handleDragover, false);
  drop.addEventListener('drop', handleDrop, false);
})();

(function() {
  var xlf = document.getElementById('xlf');
  if(!xlf.addEventListener) return;
  function handleFile(e) { do_file(e.target.files); }
  xlf.addEventListener('change', handleFile, false);
})();

var export_xlsx = (function() {
  function prep(arr) {
    var out = [];
    for(var i = 0; i < arr.length; ++i) {
      if(!arr[i]) continue;
      if(Array.isArray(arr[i])) { out[i] = arr[i]; continue };
      var o = new Array();
      Object.keys(arr[i]).forEach(function(k) { o[+k] = arr[i][k] });
      out[i] = o;
    }
    return out;
  }

  return function export_xlsx() {
    if(!cDg) return;
    /* convert canvas-datagrid data to worksheet */
    var new_ws = XLSX.utils.aoa_to_sheet(prep(cDg.data));

    /* build workbook */
    var new_wb = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(new_wb, new_ws, 'SheetJS');

    /* write file and trigger a download */
    XLSX.writeFile(new_wb, 'SheetJSCanvasDataGridExport.xlsx', {bookSST:true});
  };
})();

(async() => {
  const ab = await(await fetch("https://docs.sheetjs.com/pres.numbers")).arrayBuffer();
  process_wb(XLSX.read(ab));
})();
</script>
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