JS Scraper for RYM Charts page

rym-charts-scraper.js

getRYMChart();

function getRYMChart() {
  const rows = [["Artist-Album","Release","Genres","Link"]]

  var tables = document.querySelectorAll("div.chart_results_frame");
  var recTable = tables[0];

  var tableRows = recTable.querySelectorAll("div.topcharts_itembox");

  for (i = 0; i < tableRows.length; i++) {

    title = tableRows[i].querySelectorAll("a.release")[0].innerText.trim();

    artist = tableRows[i].querySelectorAll("a.artist")[0].innerText.trim();
   
    link = tableRows[i].querySelectorAll("a.release")[0].href;

    year = tableRows[i].querySelectorAll("div.topcharts_item_releasedate")[0].innerText.trim();

    genres = tableRows[i].querySelectorAll("div.topcharts_item_genres_container")[0].innerText.trim();

    combined = artist+' - '+title;
    
    rows[rows.length] = [combined,year,genres,link];
  
  }

  var today = new Date();
  var dd = String(today.getDate()).padStart(2, '0');
  var mm = String(today.getMonth() + 1).padStart(2, '0'); //January is 0!
  var yyyy = today.getFullYear();

  today = mm + '-' + dd + '-' + yyyy;

  filename = "rym-chart-"+today+".csv"

  exportToCsv(filename,customShuffle(rows))
}

function exportToCsv(filename, rows) {
    var processRow = function (row) {
        var finalVal = '';
        for (var j = 0; j < row.length; j++) {
            var innerValue = row[j] === null ? '' : row[j].toString();
            if (row[j] instanceof Date) {
                innerValue = row[j].toLocaleString();
            };
            var result = innerValue.replace(/"/g, '""');
            if (result.search(/("|,|\n)/g) >= 0)
                result = '"' + result + '"';
            if (j > 0)
                finalVal += ',';
            finalVal += result;
        }
        return finalVal + '\n';
    };

    var csvFile = '';
    for (var i = 0; i < rows.length; i++) {
        csvFile += processRow(rows[i]);
    }

    var blob = new Blob([csvFile], { type: 'text/csv;charset=utf-8;' });
    if (navigator.msSaveBlob) { // IE 10+
        navigator.msSaveBlob(blob, filename);
    } else {
        var link = document.createElement("a");
        if (link.download !== undefined) { // feature detection
            // Browsers that support HTML5 download attribute
            var url = URL.createObjectURL(blob);
            link.setAttribute("href", url);
            link.setAttribute("download", filename);
            link.style.visibility = 'hidden';
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        }
    }
}

function customShuffle(x) {
  var y = x.slice(1, x.length);
  var j, t, i;
  for (i = y.length - 1; i > 0; i--) {
      j = Math.floor(Math.random() * (i + 1));
      t = y[i];
      y[i] = y[j];
      y[j] = t;
  }
  return [x[0]].concat(y);
}