using jspdf from html dynamic.

jspdf_dynamic_demo.js

// working html2pdf
        async function download() {
            let srcWidth = document.body.scrollWidth;
            var margin = 18; // narrow margin - 1.27 cm (36);
            // for mobile, use 0.5 cm (14.17)
            // margin = 14.17;

            var orientation = '';

            // if desktop, use landscape. if android or iphone, use portrait. use user agent to detect
            if (navigator.userAgent.match(/Android/i) ||
                navigator.userAgent.match(/webOS/i) ||
                navigator.userAgent.match(/iPhone/i) ||
                navigator.userAgent.match(/iPad/i) ||
                navigator.userAgent.match(/iPod/i) ||
                navigator.userAgent.match(/BlackBerry/i) ||
                navigator.userAgent.match(/Windows Phone/i)) {
                orientation = 'portrait';
            } else {
                orientation = 'landscape';
            }
            

            let pdf = new jsPDF({
                orientation: orientation,
                unit: 'pt',
                format: 'a4'
            });
            let pWidth = pdf.internal.pageSize.width;
            let scale = (pWidth - margin * 2) / srcWidth;

            // console log everything
            console.log('srcWidth', srcWidth);
            console.log('pWidth', pWidth);
            console.log('scale', scale);

            // Use async/await to wait for the pdf.html() method to complete
            await pdf.html(document.body, {
                x: 1,
                y: 1,
                html2canvas: {
                    scale: scale,
                }
            });
            var pageCount = 1;
            // keep the first page and remove the rest
            while (pageCount < pdf.internal.getNumberOfPages()) {
                pdf.deletePage(2);
                // pageCount++;
            }
            // Open the PDF after the generation is complete
            // window.open(pdf.output('bloburl'));
            // save the pdf
            pdf.save('INV/' + new Date().getFullYear() + '/' + print_data.invoice_number + '.pdf');
        }

        document.addEventListener("DOMContentLoaded", function () {
            download();
        });

        // close the page after 3 seconds
        setTimeout(function () {
            window.close();
        }, 3000);
    }