Download all the highchart graph in zip file [dependency on https://stuk.github.io/jszip/]

download-charts.js

var zip = new JSZip();
// Get all the highchart elements
var hc_containers = document.querySelectorAll('.highcharts-container');
if (hc_containers.length) {
  hc_containers.forEach(function(hc, index) {
    // Get the highchart Chart object.
    chart_ele = hc.parentNode;
    var chart = chart_ele.highcharts();
    // Get the svg data from chart.
    var svg = chart.getSVG({chart:{ width: 1040 }});
    svg = "data:image/svg+xml,"+svg;
    // Get the png data URL from svg.
    var src = _get_png_data_uri(svg);
    // Add all the images in zip file.
    zip.file('chart-'+index+'.png', src, {base64: true});
  });
  // Download the file.
  var content = zip.generate({type:"blob"});
  saveAs(content, "charts.zip");
}

/**
 * Get the png file src from given svg.
 */
function _get_png_data_uri(svg) {
  // Create image object.
  var base_image = new Image();
  base_image.src = svg;
  // Create canvas and use draw image on that.
  var canvas = document.createElement('canvas');
  canvas.width = base_image.width;
  canvas.height = base_image.height;
  var context = canvas.getContext('2d');
  context.drawImage(base_image, 0, 0);
  // Convert it to data URL with png type.
  var link = canvas.toDataURL('image/png');
  var src = link.substr(link.indexOf(',') + 1);
  // Send back to URL
  return src;
}