Success generate but got another blank page

[xinyun-onesoftlab]

js:
generatePDF(invoice_no) {
var element = document.getElementById("export");
var opt = {
margin: 0,
filename: ${invoice_no}.pdf,
image: { type: "jpg", quality: 0.98 },
html2canvas: {scale:2},
jsPDF: { unit: "cm",format:[21,29.7], orientation: "portrait" }
};
html2pdf().set(opt).from(element).toCanvas().save()
},

[davidnbooth]

Is the entire pdf made of blank pages? How long is the document?

[Moziezez]

filename should look like this i guess: ${invoice_no} + '.pdf'

[davidnbooth]

@Moziezez The OP was using a template string with backtick ` characters in the code, which is fine and will work well, but github uses those to let you format text as a "code" section, so it took those characters out and applied the formatting to that section, which is why it looks strange in the post. For future reference, @xinyun-onesoftlab, you can use triple backticks ``` to make a code block like this:

generatePDF(invoice_no) {
    var element = document.getElementById("export");
    var opt = {
        margin: 0,
        filename: `${invoice_no}.pdf`,
        image: { type: "jpg", quality: 0.98 },
        html2canvas: {scale:2},
        jsPDF: { unit: "cm", format: [21, 29.7], orientation: "portrait" }
    };
    html2pdf().set(opt).from(element).toCanvas().save();
}

By the way I was asking about document length because there is a known issue where long documents are rendered entirely blank. The html3pdf solution mentioned there may resolve this issue.