html2pdf-fix-jspdf/src/plugin/jspdf-plugin.js

Client-side HTML-to-PDF rendering using pure JS

// Import dependencies.
import jsPDF from "jspdf-fix-html2pdf";

// Get dimensions of a PDF page, as determined by jsPDF.
jsPDF.getPageSize = function(orientation, unit, format) {
  // Decode options object
  if (typeof orientation === "object") {
    var options = orientation;
    orientation = options.orientation;
    unit = options.unit || unit;
    format = options.format || format;
  }

  // Default options
  unit = unit || "mm";
  format = format || "a4";
  orientation = ("" + (orientation || "P")).toLowerCase();
  var format_as_string = ("" + format).toLowerCase();

  // Size in pt of various paper formats
  var pageFormats = {
    a0: [2383.94, 3370.39],
    a1: [1683.78, 2383.94],
    a2: [1190.55, 1683.78],
    a3: [841.89, 1190.55],
    a4: [595.28, 841.89],
    a5: [419.53, 595.28],
    a6: [297.64, 419.53],
    a7: [209.76, 297.64],
    a8: [147.4, 209.76],
    a9: [104.88, 147.4],
    a10: [73.7, 104.88],
    b0: [2834.65, 4008.19],
    b1: [2004.09, 2834.65],
    b2: [1417.32, 2004.09],
    b3: [1000.63, 1417.32],
    b4: [708.66, 1000.63],
    b5: [498.9, 708.66],
    b6: [354.33, 498.9],
    b7: [249.45, 354.33],
    b8: [175.75, 249.45],
    b9: [124.72, 175.75],
    b10: [87.87, 124.72],
    c0: [2599.37, 3676.54],
    c1: [1836.85, 2599.37],
    c2: [1298.27, 1836.85],
    c3: [918.43, 1298.27],
    c4: [649.13, 918.43],
    c5: [459.21, 649.13],
    c6: [323.15, 459.21],
    c7: [229.61, 323.15],
    c8: [161.57, 229.61],
    c9: [113.39, 161.57],
    c10: [79.37, 113.39],
    dl: [311.81, 623.62],
    letter: [612, 792],
    "government-letter": [576, 756],
    legal: [612, 1008],
    "junior-legal": [576, 360],
    ledger: [1224, 792],
    tabloid: [792, 1224],
    "credit-card": [153, 243]
  };

  // Unit conversion
  switch (unit) {
    case "pt":
      var k = 1;
      break;
    case "mm":
      var k = 72 / 25.4;
      break;
    case "cm":
      var k = 72 / 2.54;
      break;
    case "in":
      var k = 72;
      break;
    case "px":
      var k = 72 / 96;
      break;
    case "pc":
      var k = 12;
      break;
    case "em":
      var k = 12;
      break;
    case "ex":
      var k = 6;
      break;
    default:
      throw "Invalid unit: " + unit;
  }

  // Dimensions are stored as user units and converted to points on output
  if (pageFormats.hasOwnProperty(format_as_string)) {
    var pageHeight = pageFormats[format_as_string][1] / k;
    var pageWidth = pageFormats[format_as_string][0] / k;
  } else {
    try {
      var pageHeight = format[1];
      var pageWidth = format[0];
    } catch (err) {
      throw new Error("Invalid format: " + format);
    }
  }

  // Handle page orientation
  if (orientation === "p" || orientation === "portrait") {
    orientation = "p";
    if (pageWidth > pageHeight) {
      var tmp = pageWidth;
      pageWidth = pageHeight;
      pageHeight = tmp;
    }
  } else if (orientation === "l" || orientation === "landscape") {
    orientation = "l";
    if (pageHeight > pageWidth) {
      var tmp = pageWidth;
      pageWidth = pageHeight;
      pageHeight = tmp;
    }
  } else {
    throw "Invalid orientation: " + orientation;
  }

  // Return information (k is the unit conversion ratio from pts)
  var info = { width: pageWidth, height: pageHeight, unit: unit, k: k };
  return info;
};

export default jsPDF;