How to give width, height, x and y coordinates in generating pdf from html using JSPDF new html API

问题

I have been using JSPDF to generate pdf document based on some html. Earlier using jspdf fromHTML Api, we could give margins like this

      var margins2 = {
      top: 415,
      bottom: 10,
      left: 55,
      width: 300
  };

  doc.fromHTML(reactListContent, margins2.left, margins2.top, {
    'width': margins2.width,
    'elementHandlers': specialElementHandlers
  }, margins2);

But, in the new .html API , how can i provide margins, width and height. The new API is like

var pdf = new jsPDF('p', 'pt', 'letter');
pdf.html(document.getElementById('html'), {
    callback: function (pdf) {
      console.log("how to get margins");
    }
});

回答1:

If you look at the source code of jspdf.debug.js, html.js has the options for x and y offsets.

opt: {
    filename: 'file.pdf',
    margin: [0, 0, 0, 0],
    enableLinks: true,
    x: 0,
    y: 0,
    html2canvas: {},
    jsPDF: {}
}

So you can set the x and y coordinates like this:

pdf.html(document.getElementById('html'), {
    x: 36,
    y: 36,
    callback: function () {
        // pdf.save('test.pdf');
        window.open(pdf.output('bloburl')); // to debug
    }
});

Unfortunately, I can't do the same by modifying the margin: [0, 0, 0, 0]. Looks like they are still working on this issue. So the short answer is NOT YET.

A work-around is to calculate the scale of html2canvas by margin:

let pdf = new jsPDF('p', 'pt', 'a4');
let left = 36; // narrow margin - 12.7 mm
let srcwidth = document.getElementById('html').style.width;
let scale = (595.28 - left * 2) / Math.ceil(srcwidth.replace('px','')); // a4 pageSize 595.28

pdf.html(document.getElementById('html'), {
    html2canvas: {
        scale: scale // default is window.devicePixelRatio,
    },
    x: left,
    y: 36,
    callback: function () {
        window.open(pdf.output('bloburl'));
    }
});

来源：https://stackoverflow.com/questions/56162138/how-to-give-width-height-x-and-y-coordinates-in-generating-pdf-from-html-using